Marsu42 said:FunPhotons said:This can theoretically give you sharper pics across the frame and less off axis illumination drop off as you stop it down to more sane apertures.
Well, theoretically - we'll see about that when the ~20mp Canon resolution doubles...
... but please do tell what exactly "off axis illumination drop off" is, I have an idea what "axis illumination" might be but I cannot google the whole concept :-o
Sorry, my physics background got the better of me, it's called 'peripheral illumination', the falloff that occurs with all lenses as you go toward the edge, most pronounced in the corners which are the closest to the edge, where it is known as vignetting.
Big lenses (1.2) give you a f/stop you'd never want to use, but they also give you a big piece of glass. Stopped down to a sane level you should get a very even image across the frame.
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