Re: Canon Response to 5D Dark Corners


"Jeremy Nixon" <jeremy@xxxxxxxxxxx> wrote in message news:121jt02773frn19@xxxxxxxxxxxxxxxxxxxxx
SNIP
It seems that a reasonable "solution" is to use lenses with an
image circle significantly larger than the sensor.

That by itself doesn't reduce light fall-off. In fact my TS-E 45mm f/2.8 (image circle diameter of 58.6mm) produces more vignetting than my EF 50mm f/1.4 (image circle of approx. 44? mm) at similar apertures and centered on optical axis.

I'll repeat; it's the lens *design* that determines the amount of light fall-off, within the physical/economical boundaries of a given lens.

Bart

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Relevant Pages

  • Re: Rich: We cant make good WA lenses to save our lives, but we did
    ... As you can see from the Dpreview review, the image circle isn't as large as Canon claims: it is unacceptably soft in the outer area. ... But it's sharp and free of CA and distortion far enough out that you can shift it up 10mm and get images that are critically sharp out to the corners. ... This would be more interesting compared to the Nikon :-) ... at f/11 it's a great lens with a 57mm image circle and at f/16 it's an OK lens with a 60mm image circle. ...
    (rec.photo.digital.slr-systems)
  • Re: Rich: We cant make good WA lenses to save our lives, but we did
    ... But it's sharp and free of CA and distortion far enough out that you ... sharpness in the corners at that amount of shift. ... The extended image circle test on that page shows the 50% MTF point. ... an OK lens with a 60mm image circle. ...
    (rec.photo.digital.slr-systems)
  • Re: will Nikon release professional "digial" lenses ?
    ... 35mm format, DX format, medium format, whatever. ... The focal length of the lens ... designing the lens for a smaller image circle. ... sensor it will get brighter". ...
    (rec.photo.digital.slr-systems)
  • Re: How lenses affect resolution and suggestion
    ... with my 28-80 that was expected to be better than my kit lens and it was ... They are both 28mm lenses. ... because the first is mounted on a camera with a larger sensor. ... But note that image circle is a completely ...
    (rec.photo.digital.slr-systems)
  • Re: sun damage
    ... Try a 50 mm f/1.4 normal lens sometime, ... And having the image of the sun as small as possible *is* the correct ... A focal plane shutter is ... You are confused about the "image circle". ...
    (rec.photo.digital)
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