Entry 51685 (Berkeley CSUA MOTD)

Berkeley CSUA MOTD:Entry 51685

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2025/05/25 [General] UID:1000 Activity:popular

5/25

2008/10/26-28 [Consumer/Camera] UID:51685 Activity:nil

10/25   It was my impression that prime lenses have better contrast and
        details. But the MTF says otherwise. For example, 24-70mm has
        HIGHER number than 50mm.  Why is that?
        http://imaging.nikon.com/products/imaging/lineup/lens/af/zoom/af-s_zoom24-70mmf_28g/index.htm
        http://imaging.nikon.com/products/imaging/lineup/lens/af/normal/af-s_50mmf_14g/index.htm
        \_ It says, "The MTF chart for each lens is based on the value at the
           maximum aperture of the lens...."  50mm f/1.4 is two full stops
           faster.  That's 4x more light it can capture.  50mm lens stopped
           down to f/2.8 will likely give much better MTF chart, not that MTF
           chart is an end-all answer to everything.
           \_ That TOTALLY makes sense, thanks! Yes I have a 50mm f/1.4 but
              I don't have a 24-70mm to play with. I do notice that at f/1.4
              it is very very soft and unusable, but at 2.8, it is much much
              sharper (more color, more contrast, better details) than my
              18-200mm. The difference is huge. Thanks for shedding light
              on 4x more light! The forum's full of smart ppl   -dumb foto guy
        \_ how about just get a 50mm f/1.8 and try it.  Borrow from a friend
           or something.  If you can't tell the difference yourself, then,
           why bother with what MTF says?

2025/05/25 [General] UID:1000 Activity:popular

5/25

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imaging.nikon.com/products/imaging/lineup/lens/af/zoom/af-s_zoom24-70mmf_28g/index.htmclosest focusing distance with focal length 35-50 mm * Filter attachment size of 77 mm * M/A mode enables instant switching from autofocus to manual focus, even during AF servo operation, with virtually no time lag * Dedicated flower-shaped lens hood effectively minimizes stray light * Lens barrel is built for comfortable holding while featuring a rugged design; of diaphragm blades 9 (rounded) Filter/attachment size 77 mm Focusing Internal Focusing (IF) system; autofocus with a built-in SWM and manual focus Diameter x length (extension from lens mount) Approx.

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imaging.nikon.com/products/imaging/lineup/lens/af/normal/af-s_50mmf_14g/index.htmof diaphragm blades 9 (rounded) Filter/attachment size 58mm Diameter x length (extension from lens mount) Approx.