wdshuck wrote:
Just used it today! I don't go wide as often, however I am always really impressed with the 25. Super sharp and the colors are wonderful right out of camera. I really wish they'd make a new 50 that has similar optical qualities.
They (meaning Cosina) have, but with the Voigtländer branding rather than Zeiss
Some things that may be of interest, but I can't give references to back them up.
Zeiss tests 80 lenses to arrive at their MTF charts, using a photopic white light, or at least that's what they were doing a few years ago.
Most manufacturer's actual QA testing is done at 20 lp/mm, a few use 30 lp/mm; none as of last year were testing higher than that.
The manufacturer's MTF never specificies what light source they input into the program. You can make an MTF awesomely great if you use a narrow band of light in your program (or on you testing machine).
RCicala wrote:
Some things that may be of interest, but I can't give references to back them up.
Zeiss tests 80 lenses to arrive at their MTF charts, using a photopic white light, or at least that's what they were doing a few years ago.
Most manufacturer's actual QA testing is done at 20 lp/mm, a few use 30 lp/mm; none as of last year were testing higher than that.
The manufacturer's MTF never specificies what light source they input into the program. You can make an MTF awesomely great if you use a narrow band of light in your program (or on you testing machine)....Show more →
Thanks Roger, that's very interesting information.