Should you get a teleconverter?

What if I told you that there is a magic little gadget you can buy and install between your lens and camera, and all of a sudden the lens is significantly longer and has more reach? Does that sound too good to be true? Well, it is not. The name is teleconverter, and it comes in different variations but they all do the same: make your lens longer.

Teleconverters for Nikon comes in 1.4x, 1.7x and 2.0x meaning that the length of your lens is extended with 40%, 70% and whopping 100%! And good news is that the teleconverter is a relatively small device that does not add much weight to your setup. But it is not a free ride.

First, extenders are expensive. In order for the converter to work well and not deteriorate image quality, the glass in the converter has to be of super high quality. In addition the converter has to be 100% transparent in facilitating the communication between the lens and the camera in order for the auto focus system to work as efficient and fast as without the converter. That is a demanding challenge for the engineers. So good converters are expensive for good reasons.

Second, getting a teleconverter that works with your lens and camera may be a bit of a pain, especially if you say shoot with a Nikon body and a Tamron lens – should you then go with a Nikon teleconverter or a Tamron teleconverter? Difficult to say if you ask me. You can get third party converters that are more reasonably priced than the main brands, but make sure you study the spec sheet to see if your combo of lens and body is supported.

Third, the speed of your lens is affected negatively. How much depends on the specific model, but you can rest assured that if you have f/2.8 as your current widest aperture, then that max aperture will drop as a consequence of adding a teleconverter. So if you are shooting fast moving subjects, this could be a negative impact you seriously need to take into consideration before making the buy decision. And in addition most teleconverters will also give rise to a slight decline in image quality although the very best teleconverters will keep this decline at an absolute minimum.

And finally, if we are talking Nikon, the teleconverters only work on full frame lenses with built in auto focus motors. So AF glass will not do. Nor will APS-C glass.

So, as you have maybe guessed, I am a bit sceptical when it comes to teleconverters. I know many professional wildlife photographers use teleconverters with great success, but I just want you to understand all the down sides of the teleconverters before you go for it. Alternatively, of you have an APS-C camera lying around, try mounting that to your full frame lens – that will give you 40-50% more reach for free. Of course you then run around with a lot of glass you don’t use, but at least you are using the best part of the glass in the lens – the centre part. I have had my Nikon Z50 mounted with my 200-500 Nikkor lens and that gave a wonderful boost to the reach.

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Review: Looking East, portraits by Steve McCurry.

No introduction needed? In photography I guess Steve McCurry is as famous as Rolling Stones is amongst rock fans. An institution. Member of Magnum Photos of course. Long standing contributor to National Geographics. Ropert Capa gold medal. The list goes on.

Looking East, portraits by steve McCurry.
Looking East, portraits by Steve McCurry.

His image of the Afghan girl spiralled him into fame a long time ago, and the circumstances in which the image was taken has recently just added to the myth and the fame.

But back to planet earth and this book. It is quite large measuring approx 28 by 38 centimeter and contrary to what I had expected, it is not a hardback. Despite this, there is still a premium feel to the book, as each image is given a full page with the opposite page simply listing the location of the shoot.

You’ll find 120 images all shot in South and Southeast Asia. All portraits: Men, women and children. There is very little text in the book – normally you’ll find some curator introducing a photo book with 3-4 pages of intellectual perspectives to the photographers work and how the specific collection in the book came about. Not here. Apart from some few notes on the cover the the book, you will only find 120 wonderful images. The Independent is quoted for writing that “his images often dance on a knife-edge between sensuality and tragedy, sentiment and anguish”.

The picture that made Steve McCurry famous.
The picture that made Steve McCurry famous.

My label on McCurry’s work is “intense”. It is a part of the world where the colours are intense as well as the people. McCurry’s photography work is of course technically impeccable, but add to that the ability to capture people in exactly that split second where they reveal something more than just a headshot. And then of course travelling a part of the world that has fascinated him ever since he crossed the Pakistan border for the first time, many, many years ago.

If you like portraits, if you like a good coffee table book and if you like South and Southeast Asia, then this book is an absolute must. It is priced around 25 pounds here in 2023 and if you ask me, it is worth every penny.

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What is colour depth in photography?

Colour is reproduced mixing 3 channels of primary colour (Red, Green, Blue) and the colour depth tells how much information can be stored per colour channel. As each bit can hold a value of either 1 or 0, and combining say 8 bits for one channel allows to store up to 2^8=256 different values.

If there is room for 8 bits per channel, the total number of colours will then be a combination of the 3 channel meaning 256*256*256 = more than 16 million combinations. So a 8 bit colour depth yields more than 16 million combinations.

Notice that if the image is monochromatic and e.g. only uses the red channel, then the number of combinations are dramatically reduced as the other channels are not used for storing information.

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Review: Ravens by Masahisa Fukase

Ravens by Fukase is consistently proclaimed as one of the most important photo books in the history of the medium. That is pretty big words, but I must say that after reading the book, I tend to agree.

Ravens by Fukase
Ravens by Fukase comes in a grey cover to protect the black hardcover book.

Fukase’s life was certainly not an easy one and his studies of the ravens is all about solitude and feeling alone. So do not expect this book to be an easy read – it is as brutal and dark as it gets, and yet there is also a stunning beautiful side to these images. It is probably this stark contrast that makes this book so extraordinary. And of course the life of Fukase, which is the backdrop for the images presented in Ravens.

Ravens by Fukase
Ravens by Fukase – black hard cover.

Not everyone agrees that this is one of the most important photography books ever. Maybe it is because the book is more appreciated if you know a little about the life of Fukase? That Japanese mythology sees Ravens as omens of impending doom? That Fukase for many years photographed nothing but his wife? That his last 20 years was spent in a coma after an almost fatal accident? The saying that the photographs say more about the photographer than the subject is perhaps more true when it comes to Fukase than anyone else. Fukase said that he had become a raven himself.

Ravens by Fukase
Sample image from the book. The flash light illuminates the eyes of the ravens.

All this is as dark as it gets. But there is also great beauty to be found in this book if you look for it, and hence this book comes with my highest recommendations.

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What is specular light versus diffused light

I must admit that I keep getting confused about specular light vs diffused light relative to soft light vs hard light. It is especially diffused light and soft light that I mix up, but let me give it a try.

If you see tarmac on a sunny day, the tarmac does not reflect very much light (it tends to absorb the light and get warm for that reason), but as soon as you have rain hitting the tarmac, the water on the surface will start reflecting the light and will do so in a way where the incoming light is reflected pretty close to how it arrived. So all of a sudden the reflections of the light in the water is very bright – I am sure you have tried this driving home late at night; the headlights from the oncoming cars is suddenly a nuisance because the rain set in.

So for me specular light is very much about the “dynamic range” of how the light is reflected on a surface. If the brights are very bright and the darks are very dark, then the light is specular. Remember here that the nature of the light is assessed looking at how it is reflected by the subject.

Diffused light however will have much less contrast between light and dark. It tend to be more “shades of grey” than black and white, to put it simply. The subject appears more evenly lit.

One of the tests that I often do when reviewing a lens is to shoot a piece of tinfoil curled up into a ball. Such a subject will yield specular light where the brights are very bright and the darks are very dark; excellent for revealing issues with chromatic aberrations, which you will often see where the contrast between bright and dark meet.

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Review: Josef Koudelka, Exiles

Josef Koudelka, Exiles
Front page of Josef Koudelka’s book Exiles. The front page image is probably the most famous of all Koudelka’s work.

Koudelka is right up there with some of the biggest photographers of all time like Henri Cartier-Bresson, so if you are interested in photography and you have not enjoyed the work of Koudelka, you have something to look forward to! In the book by David Gibson with 100 iconic images, of course there is one by Koudelka, actually exactly the same as covers the front page of this book: Exiles.

Be aware that the book has developed since the 1988 classic was published, and more images have been added, so if you want the full monty, make sure to get the latest version of the book (shopping link right here).

Josef Koudelka, Exiles
Simple and yet very powerful. That is my best way of describing many of Koudelka’s images. “Simple” is not a good word as it may give the wrong associations, but is the best I can come up with.

Cornell Capa is quoted on the cover sleeve to say that “Koudelka’s unsentimental, stark, brooding, intensely human imagery reflects his own spirit, the very essence of an exile who is at home wherever his wandering body finds haven in the night.” So you can really put some serious words and analysis to Koudelka’s work, and curators and others absolutely love to add some of the most complicated words available to praise Koudelka’s work. I have no ambition to compete with all that.

Josef Koudelka, Exiles
I’ll let the image speak for itself.

Rather, I would quote Leonardo da Vinci for saying something close to this: “Simplification is the ultimate sophistication”. I know wise men debate if it was actually Leonardo saying this and if these were the exact words, but the gist of it is what I want to get to, because it describes how I see Koudelka’s work. His images are so powerful and clear in their communication, and there is not a single distraction or any object in the images that do not aid the storytelling. The motto of photographer Joel Sartore is that if something in your frame is not working with you, it is actually working against you. It seems to me that Koudelka, who probably knows nothing of Joel’s motto, is the embodiment of working according to this rule.

Josef Koudelka, Exiles
You can analyse this image from a composition point of view until you drop dead. Or you can just enjoy the image of a master.

So Koudelka is a big inspiration for my aspirations as a photographer. And for that reason and of course I can recommend this book about Koudelka. There are a few interesting introduction pages, but otherwise the book simply present 75 of Koudelka’s images (+ index). And what images! In this blog I have shared 3 examples beyond the front page, and I hope they will inspire you to seek out more of Koudelka’s outstanding work.

Video link

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What is DPI in photography?

DPI is dots per inch, and is often used to describe the (max) resolution a printer can offer, but it is also applicable for scanners. Contrary to PPI, the DPI for a printer or a scanner is not fixed but can vary subject to the print mode. So you can print and scan at different DPI levels, subject to your needs. The higher the resolution required, the longer the scan or print will take, so when you don’t nee the high resolution, it is nice to be able to prioritise speed over resolution.

When printing, the DPI needs to be significantly higher than the PPI for a screen, and this is because the printer builds a colour combining different base colours, and hence more base colour dots in combination are needed to make up for a similar dot on the screen. So when you read the spec sheet for a good colour printer, the DPI is often much higher than the PPI for a screen.

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What is BSI in photography?

BSI is Back Side Illumination in a digital camera sensor.

It gets very technical very quickly, but the gist of it is that BSI is a new way of organising the layers in the digital sensor of camera. The new layering  allows more light to travel to the pixels that read the light.

The big benefit of BSI is more precise reading of the light. Some say that the signal to noise ratio is improved, others that the dynamic rang is increased. If you compare the spec sheet of a traditional sensor with a back side illuminated sensor, the difference should appear as better specs for the BSI sensor.

In my experience, the improvements are shallow. I have both the Nikon D750 and the Nikon Z6ii, i.e. one camera with a traditional sensor and another with BSI. For my style of shooting (outdoor photography), I can hardly tell the difference, and I think it is because we are comparing some very good sensors to some very, very good ones!

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What is IBIS in photography?

What is IBIS in photography?

IBIS is In Body Image Stabilisation.

It is a stabilisation system in the camera body, opposed to stabilisation that you will find in a lens. Some camera systems allow both the in body and the in lens stabilisation systems to work together to maximise the effect.

The point with stabilisation is to mitigate camera shake. If you shoot with a slow shutter opening time, it is possible to move the camera a good deal while the shutter is open. This will be visible in the image; it may look blurred or not sharp.

The classic way to mitigate this is via the use of a tripod to stabilise the camera. An alternative is to follow the reciprocal rule, that says that the shutter speed should be equal to or faster than the reciprocal focal length. So if you are shooting at 100mm, you should not shoot slower than 1/100th of a second.

IBIS in the camera body allows you to shoot handheld at slower shutter speeds than what the reciprocal rule suggests.

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Portrait Photography Away – Check list for beginners (part 2)

Photographers often question their current gear and is constantly scanning the market for better options with more advanced features. There is often no need for that. Your good old trusty DSLR will do just fine!

Gear acquisition syndrome (GAS) is a common disease amongst photographers.

Yes, a more modern camera may have more megapixels and face recognition and the like, but I would suggest that you put these considerations to a side and focus on getting to know your camera. Not that you need to know and understand each and every detail about the deepest menu system, but more the basics related to focus and exposure. Here I will take you through some of the important aspects of your camera and gear.

Megapixels

How many megapixels do you need as a portrait photographer? Not many. I have shot with my trusty old Nikon D700, and it is a 12megapixel  camera, and used the files to print in size 70 x 100 cm and the client was happy as can be. The thing is, the larger you print, the larger the viewing distance.

If you see a large print on a wall, your natural reaction is to take a step back to allow you to take it all in. Otherwise you will be viewing the image as you would a tennis match – your eyes would go back and forth, and most don’t do that, but take a step back. If you pass a billboard, try to go up close. You will see that the resolution is very low (= looks horrible!), as it is intended to be viewed from far away.

The most common reason for wanting a lot of megapixels is to be able to crop, but if you frame your images carefully, then cropping should not be necessary. When the first digital cameras came out, they had only about 8 megapixels, but it was still amazing images the pros could produce. So don’t worry about the number of megapixels. Worry about filling the frame with your subject, and you are good to go.

Sensor size

Another common worry amongst photographers is choosing between APS-C and full frame. There are differences, granted, and you need less light with a full frame camera. But modern sensors (i.e. produced within the last 15 years) are so good that I find the difference to be negligible. You can shoot amazing images also with APS-C. So I would not worry about the sensor size.

File format

Your camera most likely offers different file formats – the one with most information is RAW and that is the format I recommend. You will get the most flexibility and headroom if you shoot raw. But there is a downside of course, and that is the space it requires both on your memory card and your computer.

You can do fine with say a JPG file, but you cannot recover so many details from the shadows or highlights if you need to, when your exposure is a bit off or the dynamic range of the scene stresses the dynamic range of the camera. So it is a balance between the need for post processing flexibility and saving disc space. Your call. My suggestion is to go for the flexibility and then have sufficient storage to accommodate the raw format.

Exposure parameters

Exposure is obviously important. But with digital photography and raw file formats, I would say less so now than in the film days. You can do a lot of adjustments to exposure in post when you shoot raw, and also you can preview the images on the camera’s rear LCD, along with a histogram. So if your exposure is off, then the options for learning about this while shooting are many.

But, there are 3 vital parameters you need to work with when we are talking exposure: ISO, aperture and shutter speed.

Your camera comes with a base ISO value, typically 100 or 200. From here you can turn up the volume and the higher ISO, the less light the camera needs to expose correct, all things being equal. The down side is that you will pay a price in terms of grainy images and washed out colours if you go too high on the ISO.

You can test this with your specific camera model, but I would stay below or at ISO 2000 as the limit. Different cameras have different limits to when the images start to turn bad, so give it a try with your camera model and see where the pain point starts to set in and stay well below that.

Auto ISO can be a great help. It means that the camera sets the ISO automatically to give the correct exposure. Typically you can limit the ISO so the camera will not go over a certain value – I recommend that you set this limit so you are sure not to come home with grainy images. And then I recommend that you switch Auto ISO on – it gives a bit more headroom for the shutter speed and aperture.

Shutter speed

Speaking of shutter speed, the reciprocal rule says that you should not go slower than the reciprocal value of your focal length. So if you are shooting at 85mm, then 1/85th of a second is the slowest you can go. Modern cameras with vibration reduction in both lens and camera have moved these limits and allow much slower shutter speeds, but if you have a good old DSLR with no vibration reduction, then the reciprocal rule is a good guide.

Aperture

If you ask me, aperture is the most important parameter in the exposure settings, as it dictates the depth of field. The more closed down the aperture is (higher f-stop numbers) the more depth of field (DOF) you get. And depth of field can be a life saver if you don’t manage to get the focus just right –  the DOF introduces a “forgiveness” factor that can save you from minor misses on focus.

Google a depth of field calculator app and load it into your smartphone. Put in the parameter from your camera and the settings you plan to use and see what DOF you get. I prefer to have a DOF of at least 30-40 cm, so that when I focus on the eyer, the person in focus is sharp front to back. Notice that even though the aperture has a big influence on the DOF, the distance to the subject has even more. So getting some space between you and the subject can be absolutely vital for getting the DOF you want.

Exposure modes

Your camera will have several exposure modes: PASM, meaning program, aperture priority, shutter priority and manual.  To allow you to focus on the client and the shoot, I would stay clear of manual mode unless you are very comfortable with keeping an eye on the light meter. Aperture priority means that you are the boss when it comes to the aperture, and the camera selects the shutter speed. For shutter priority it is the other way around. Program mode means that the camera sets both the aperture and the shutter speed – this is the mode where you have less control.

Finally, many cameras also have a Auto mode. It is the same as program mode, but in addition the camera has pre-selected and locked a number of other values so it is in “point and shoot” mode.

I typically shoot in aperture priority to control the DOF, and the camera then selects the shutter speed. And in addition I switch on auto ISO, so the camera has to variables to play with to get the exposure right. But I always try to keep an eye on the shutter speed, to make sure it does not get too slow.

Compensation

Your camera probably has an exposure compensation button. It typically sits close to the shutter release button and has a +/- sign. If you push that button, your can use the front or rear command dials to set the exposure compensation in stops of light.

It can be very useful if you don’t agree to the cameras automated metering, i.e. you find that it systematically exposes to much or too little, or you just want to protect the highlights. The adjustment of the automated exposure can be really useful, but be careful when you have it activated – you may forget it is on! Keep an eye out for the metering scale – it will show if you have compensation turned on.

Metering modes

Your camera probably offers a number of metering modes. The most automated and advanced is named matrix or weighted metering. That is the one I would recommend you to use.

For portrait there is an alternative to consider and that is the center weighted mode. It will prioritize metering according to the amount of light in the center of the frame. This can be useful if you are shooting against a very bright background like at white backdrop.

No matter which mode you choose, it will not change the amount of ambient light- only the way the camera interprets the light.

Shake

You don’t want shake or movement. Camera shake is when the camera is moved while the shutter is pen. Movement is when the subject moves while the shutter is open. The slower the shutter speed, the bigger the risk of shake and movement there is.

Shake and movement is not what you want in portrait photography. You can use it creatively for some images, but my guess is that for the most part your client would like to have images that are not blurred. And shake and movement will look blurred. Many mistake images with blur for being out of focus, but the cause is different.

A tripod is a good way to mitigate camera shake. But it does take up space in your backpack, and although modern tripods comes in carbon versions, there is still a weight penalty to be paid. If you are to do 100 corporate headshots, then you definitely want the camera to be on a tripod to make sure you get exactly the same angle and position for each image (along with a cross on the floor to indicate where the employee is to stand).

When we are on the subject of tripods: consider to get an l-bracket. It makes shooting in portrait mode so much easier without tipping the balance of your camera on the tripod.

White balance

Your camera probably has a button named “WB” or a quick menu where you can set the white balance. The white balance is something camera producers generally try to make accessible easily.

Don’t mix light sources with different colour temperatures – it is a safe route to trouble, unless you shoot black and white!

You will probably find that your camera offers a lot of options for white balance settings. Don’t worry and put the camera in automatic mode. Modern cameras have an excellent white balance automatic system, and you can always tweak the white balance in post if you are not happy with the chosen Kelvin value!

However, be careful not to mix two colour temperatures! I once photographed a birthday where the party was held inside (candescent light) but there were some very big windows also that contributed with a lot of natural light (sun). When I shot people standing close to the window or even worse: with the window as a backdrop, I got two different colour temperatures mixed! The result: Either their skin tone looked absolutely horrible and the room colours looked ok, or their skin tone looked natural and the room had the most weird colours! That taught me to not mix colour temperatures!

Focus settings

Your camera probably has a lot of options for setting focus, and with mirrorless cameras it has gotten a bit more complicated adding face recognition and even recognition of animal faces! So many choices!

My advice is: shoot with a focus option where you control what the camera selects to focus on. In auto focus mode, you have no control of what the camera focuses on, and it will typically select whatever is the closest to the camera. But that my not be what you want it to focus on.

I prefer a low tech option that gives me control. So I usually shoot with a small focus point that I can move around with the command wheel on the rear of my camera. If you don’t have time to move the focus point around, then move the camera so the focus point is on the eye of your subject, half press the shutter to lock focus, recompose (i.e. move the camera so you get the framing you want) and then press the shutter fully to take the picture. When you’ve done this a few times, it quickly becomes second nature.

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