Archived posting to the Leica Users Group, 2001/07/31
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> This is actually rather simple. > Let's compare Mamiya 7's 80 mm F/4 vs > Leica 50 mm f/2 summicron. At optimum > apertures for both, the cron can resolve > 110 lpmm, and 80f/4L can resolve 75 > lpmm. I am honestly curious, where did you get that info? Were the both at the same contrast level, and what was the contrast level used? > Don't forget also that in terms of exposure > accuracy, Leica's ancient, mechanical > shutter can be off 1/3 EV, while Mamiya's > electronic shutter is about 1/10 EV. Yes, but that depends on what the resolution of your metering system is...I doubt, though the Mamiya shutter may be able to maintain the speed to 1/10 of set speed, that the meter will be near that accurate. > By the way, the 110 lpmm is an overestimate, > I've seen literature saying the cron can > do 90 lpmm. I think Erwin Puts said it can > do beyond 100. At what contrast level are each tested at?