Auto aperture iris control is great for convenience. Just twist the dial on your camera (often in third stop increments) and select the aperture you want, or even let the camera choose it for you in an auto mode. It’s quick and painless.
The downside, of course, is that the actual significance of what is happening when that iris is opened wide or closed down is often lost upon modern photographers. We can talk about “stopping down” a lens or the advantage of a wide aperture prime, but until you have actually seen the difference in an aperture iris you won’t have a full sense of what that really means. Take a look at this series from the new Rokinon 50mm f/1.4.
When you actually see that aperture closing down you really get a sense of the difference between the f-stops and how much more light gathering there actually is at wide apertures. This series starts at f/1.4 and goes to f/8 – see how much difference the aperture size makes in the amount of light entering the camera?
My wife is an intelligent woman. She even has a pretty decent eye as a photographer, and has taken some great photos. But despite having been married to a gear guy since 1997, and having a hundred or so lenses going in and out of our house, she still to this day often gets confused about aperture. It can be confusing, as the logic (due to the way that f-stops often get reported) is backwards. Bigger numbers mean smaller apertures -and that seems backwards. There is no mistaking this with a manual focus lens with a manual aperture ring – you can physically see the aperture iris shrinking as you stop the lens down (choose a smaller aperture size – larger f-stop, like f/11 etc).
More photographers would get what aperture numbers really mean in terms of light gathering, if they physically saw the aperture blades close down or open in their lenses.
Most cameras have a standard focusing screen, that does not show the true depth of field. This, added with the fact that the camera typically focuses with the lens wide opened, means that you often don’t get a sense of how much less light is available when the lens is stopped down (f/4-f/16, for example) or how much more is available at large apertures (f/1.2-f/2.8). Most DSLRs have a DOF (depth of field) preview button somewhere, but it is often in an obscure location and rarely gets used by many people. For this reason many photographers have never seen the true depth of field of any of their wide aperture lenses, or any other lens for that matters. This changes when you use a manual focus lens (particularly with a focus screen that shows true depth of field). More on this in a moment.
Yes, it is a pain when the viewfinder is quite dark when you have a manual aperture lens mounted and stopped down to, say, f/8. That’s the reason that modern lenses and cameras don’t show you this in your viewfinder. But it also means that you aren’t being forced to learn what f/8 really means in terms of light gathering. You also don’t see how much more light is available, or how much more shallow the depth of field is with a large aperture. You don’t really think about your aperture setting at the time of capture, resulting in a loss of creativity because your mind isn’t forced to visualize what aperture means to the shot.
But beyond this, manually selecting your aperture really helps you to mentally dial in the relationship between aperture and depth of field. The fact that you have to think about selecting the aperture, and see a difference in the viewfinder, in both the depth of field and the amount of light, helps you to realize how shallow depth of field shots (with a large aperture) and large depth of field shots (with a small aperture) are going to turn out. I have learned how to mentally visualize how depth of field is going to affect a scene so much more because of using manual aperture lenses. Here is a series from the Zeiss Planar T* 50mm f/1.4 lens. It starts at f/1.4, f/2, f/2.8, and then finally shows f/4. Notice the huge difference this makes to the degree in which the background is blurred.
The large aperture shots are much more attractive, and give a better three dimensional effect to the image. You probably won’t always shoot with manual focus lenses, but using one will help train your brain to visualize your shots more effectively and artistically.
Depth of Field and Focus
It is quite a revelation to use a wide aperture, manual focus prime, with a focusing screen like an EG-S that shows true depth of field. At close to medium distances you can actually watch focus travel from one thing to another, and subjects pop into focus. It really helps you think about storytelling as a part of your imagery. When you think about what you want in focus, it means that you have become intentional about what you want your viewer to see.
Many cameras have AF point spreads that are not wide enough to reach the edges of the frame. Manual focus lenses remove that limitation, and I am more likely to take an image with my subject in focus in an extreme corner when I use one. The rule of thirds for composition is a great starting tool, but sometimes rules are made to be broken. Take a look at this shot of a family games night. The cards are in the extreme bottom corner. Your eye goes there first, but then considers the whole out of focus scene beyond. Your brain allows you to mentally fill in the blanks, and image possibilities, rather than just a looking at a scene.
Many macro photographers have learned to choose to use manual focus at those very fine distances. It is often challenging to place an AF focus point right where you need it (particularly when using a tripod), but manually focusing allows you to simply focus until what you need to be in focus is sharp. I’ve heard a lot of people fuss over the focus speed of some macro lenses, including the amazing EF 100mm f/2.8L IS. All I can say is that you need to use a manual focus macro lens sometime. Using the Zeiss Makro-Planar in either a 50mm or 100mm focal length helps you to realize how much the macro range adds to the focus possibilities of such a lens. There are so many extra focus points! Using a manual focus macro lens will certainly help you appreciate the AF on macro lenses, and will also help you understand why the AF focus (distance) limiter switch is there and how to properly use it.
Learning to focus with a manual focus lens will help your mind to understand how to better use autofocus lenses (particularly those with focus limiters).
We live in a high-paced world. We want everything to be faster and easier. But great art is rarely created is rarely created in a rush. When I am shooting professional event work and weddings, I tend to use image stabilized, wide aperture, zoom lenses. They are big and heavy, but they are extremely flexible and deliver great results. I need speed in those situations, but some of my most creative shots in my catalogue have been taken with manual focus lenses. I slow down and become more creative. Some of my most critically acclaimed images have been taken with manual focus lenses, both inexpensive and expensive ones.
If you have been guilty of doing most of your photography in a rush, do yourself a favor a get yourself a manual focus lens (even a cheap one). If you want a cheap option, grab yourself an SMC Takumar 55mm f/1.8, and an adapter to your mount of choice. You can probably get a lens and an adapter for under $100. It takes some amazing pictures, and will open a world of appreciation for some of the lenses from another era. It will probably also make you a better photographer.
Even better is the SMC Takumar 50mm f/1.4, or if you want to use a value oriented modern manual focus lens, try one in your favorite focal length from Rokinon or Samyang (same thing, just rebranded lenses). You’ll find a number of reviews of different ones on my website. If you are willing to spend more and want the finest optics and image quality available, Carl Zeiss makes some of the best lenses period. They tend to be mostly manual focus, and I’ve had the privilege of using and reviewing many of them.
Once you learn how to take good pictures with a manual lens, shooting with your modern gear will seem easier than ever, and you might even use it more creatively. These are just a few reasons why every photographer should spend some time with a manual focus only lens.
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