The concept of the pancake lens has interested me for a while now, so when Canon announced its new 40mm pancake lens I bought one. So far it has proved a useful addition to my lens collection. But what exactly is a pancake lens? Is the lens as good in practise as I hoped? Here are my thoughts.
What is a pancake lens?
A pancake lens is simply a lens that is shorter than it is wide. This is unusual in lens design and as a result a pancake lens is smaller and lighter than a regular lens.
The above photo shows the dimensions of the Canon 40mm pancake lens. As SLR lenses go it is tiny.
Pancake lenses have several other advantages:
They are prime lenses. From an optical design point of view they are pretty simple, much like a 50mm prime lens. The Canon 40mm pancake lens has six elements, whereas zooms usually have ten to twenty elements. This translates to high image quality and lower manufacturing costs.
Price. Pancake lenses tend to be inexpensive. You get a lot of bang for your buck in terms of image quality.
Aperture. The maximum aperture of my 40mm pancake lens is f2.8. This is not especially impressive for a prime lens, but better than most zooms. If your main lens is a kit lens you will certainly appreciate the improvement.
Short minimum focusing distance. The 40mm pancake lens can focus on a subject within 28 centimetres of the camera. This is quite close, and you can get even closer by using extension tubes.
Pentax makes several pancake lenses for its digital SLRS and mirrorless cameras. Samsung also make several models (for the NX-series cameras) and Sony makes a 16mm pancake lens for its NEX mirrorless cameras.
Panasonic also offers pancake lenses for its Lumix cameras and Olympus makes a couple for its Four Thirds and Micro Four Thirds cameras. Leica owners aren’t left out – Voigtlander make two pancake lenses for Leica M cameras.
Handling and performance
Whenever I buy a new lens I spend time taking photos with it. This helps me get a feel for the perspective and bokeh in various situations.
I’ve been using my pancake lens for close-up, landscape and portraiture.
Handling is an important aspect of any camera/lens combination. The 40mm pancake lens is light, and my camera is relatively heavy. I don’t even notice the addition of the lens. The picture above shows my setup.
This is great for balance. It’s the opposite to using a heavy telephoto lens, which I always find hard to steady. With the pancake lens the centre of gravity of the setup is closer to my body. This makes it easy to hold the camera still.
The advantages of size and balance extend to all pancake lenses. If you want to maximise image quality from a portable set-up, then a pancake lens on a mirrorless camera is hard to beat.
40mm is an interesting focal length. On a full-frame camera it’s a moderate wide-angle. On an APS-C camera, thanks to the crop factor, it effectively becomes a short telephoto lens.
I use the pancake lens on a full-frame camera as I like the perspective of the moderate wide-angle.
One disadvantage of pancake lenses is that they don’t have a distance scale. Therefore it’s hard to tell exactly where it’s focused. I find this a little disconcerting as I like to use the hyperfocal distance focusing technique to maximise depth-of-field.
Another disadvantage is that I prefer to use a wide-angle zoom rather than a prime lens for landscape photos. I often find myself in locations where it is impossible to get physically closer to the subject therefore a zoom helps obtain precise framing.
For me, a pancake lens is not a great landscape lens. Except for one thing – it is tremendously sharp.
Here is a series of portraits taken with my pancake lens. I love this lens for portraits. The 40mm focal length lets me get close to the subject for an intimate feel, without the distortion created by shorter focal lengths.
The maximum aperture of f2.8 lets me take photos with blurred backgrounds. I don’t miss wider apertures as much as I thought I would.
It is difficult to focus accurately on the sitter’s eyes at f1.4 or f1.8 and using f2.8 gives me a little more margin for error.
Finally, here are some photos taken with the 40mm pancake lens fitted with an EF12 extension tube.
There is an impressive degree of magnification, perfect for taking photos of flowers and plants.
Landscape photography aside, the Canon 40mm pancake lens hasn’t disappointed. It’s light, well-built, the autofocus works well and it has excellent image quality. Furthermore it’s one of Canon’s cheapest lenses and probably the best value for money out of the entire Canon range.
I’m very happy with my purchase. If you’re looking for a portable, inexpensive, high quality lens, then I recommend you consider a pancake lens.
About the Author:
Andrew S Gibson is a professional photographer currently based in New Zealand. He has taken photographs in 60 countries now as an a Technical Editor for EOS magazine. He recently produced a Understanding EOS series of eBooks which you can find here:
Happy shooting! I hope this article has been helpful, it appears pancake lenses are here to stay.
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