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? |