A History Lesson on Canon 20mm Lenses

...Canon was proud of their floating rear focusing system with the claim that you'd get sharp images no matter the distance of the subject. I guess this could be considered true if every image is soft. ...
Thank you very much for that phrase. That made my day and I still have to to gasp for breath laughing that much :ROFLMAO:
 
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I bought the sister lens of the FD 20, the FD-n 17mm f/4 maybe 40 years ago 2nd hand for 450 "Deutsche Mark" / 200$ of mid 1980s.
While it has the soft corners too it was good on film (ISO400 B/W) and rendering was o.k.
In terms of flares it is great because it has lots of them and it is good enough for 2k or just 4k video. If I will ever do some night scene of a car with strong headlights, this might be a good choice because of these flares!
 
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20mm is indeed the sweet spot of wide angle. Just bought the 1.4 for handheld milky way and aurora but realized its just plain fun and very useful as a general purpose low light lens, especially indoors at parties. Nice bokeh for macro-ish flower pics and okay sunstars doesnt hurt either
 
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I had an EF 20 mm f/2.8 USM back about 20 years ago.
The good: decent sharpness on a 6 mpix sensor when stopped down to f/11. Moderate red-green fringing was easily corrected. Fast and silent AF. Decent build.
The bad: useless wide-open. Really soft corners. Heavy vignetting across much of the frame even when stopped down (really noticeable on slides).
I got a good price for it when I sold it. I felt a bit sorry for the guy I sold it to.
 
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I have the EF 20mm f/2.8 USM still. It's definitely a character lens. If you want a native sharp performance for most places you need to hit f/5.6 and for everywhere you need f/8. f/2.8 is great for isolating a point and letting the surroundings drift away — think of a focal point in a bar or old barn where the rest is merely a suggestion of place.

With DLO the situation improves by leaps and bounds! It was DLO that kept the lens in my bag, and it remains a good option for autumn landscapes, casual wide travel (it is small), etc. You'll never shoot it for critical sharpness, but... but... it has a pleasant character to the rendering. One of those I like this chocolate better than that chocolate feelings. In the hand it has a nice feel. That stated, it will never be an EF 24mm f/1.4 II.

The EF 28mm f/1.8 USM never thrilled me. It has a great form factor, but I never liked the rendering. Even with DLO. Good on a crop, however, and so my kiddo now owns my copy.

20mm is a very pleasant framing for the world. When it comes to people, the subject is the scene and the person is a prop.
 
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while not a canon-made lens, i can very much recommend the voigtlander EF 20mm 3.5 SL II, manual focus, automatic aperture lens. it's not pin sharp by any modern standards but has plenty of character, and being a pancake lens it's very fun to use.
 
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I could almost swear we've discussed the EF 20mm here before @Canon Rumors

It's funny that you mention this lens now, as last week I was somewhat considering it - that was until I saw its vignetting, which is over 1 stop darker than the RF 16mm f/2.8😱

I'm considering the EF 28mm f/1.8 USM though, they're cheap these days, and they're about the same size as the RF 45mm, with the adapter.
 
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