Some fast math in this thread:
http://www.rangefinderforum.com/forums/showthread.php?t=84953
and I speculated that the Jupiter-3, and Zeiss Sonnar that it was derived from, was a perfect match for the Leica M8's Bayer Pattern Mosaic filter. Basically, the Bayer site is a 2x2 grid of 6.8micron sensor elements.
And another reason to take some pictures of grass in the Sun.
1949 ZK Sonnar, original German parts.
At F1.5 the spec is 30LP/mm
100% crop:
at F4 resolution improves:
100% crop:
Color aliasing is creeping in. Note "color Sparkles" on some of the pixels.
What lesson can be learned from this?
Well, for one I like shooting pictures of grass in the Sun to test lenses.
Also opening the aperture up on a lens is a quick and dirty AA filter.
http://www.rangefinderforum.com/forums/showthread.php?t=84953
and I speculated that the Jupiter-3, and Zeiss Sonnar that it was derived from, was a perfect match for the Leica M8's Bayer Pattern Mosaic filter. Basically, the Bayer site is a 2x2 grid of 6.8micron sensor elements.
And another reason to take some pictures of grass in the Sun.
1949 ZK Sonnar, original German parts.
At F1.5 the spec is 30LP/mm
100% crop:
at F4 resolution improves:
100% crop:
Color aliasing is creeping in. Note "color Sparkles" on some of the pixels.
What lesson can be learned from this?
Well, for one I like shooting pictures of grass in the Sun to test lenses.
Also opening the aperture up on a lens is a quick and dirty AA filter.
Y.B.hudson III
Member
I like the J 3 at f/1.8~f/2.0 (increased contrast and sharpness)...at f/4 I start getting a color shift towards blue, indicating diffraction raising it's little head...maybe?
Diffraction is not the cause of the color shift, it is the increase in contrast and resolution.
Diffraction creeps in at about a 3mm opening (from memory), which is F16 on the Jupiter-3.
Diffraction creeps in at about a 3mm opening (from memory), which is F16 on the Jupiter-3.