At 5/10/2021 02:59 PM, Mike wrote:
>Looks like Roger at Lensrentals is no longer a hidden font of knowledge
>requiring going to his website at Lensrentals or blog-- now has a deserved
>wide audience even if in general don't exactly find the current forum where
>they posted his article optimal.
>
>The recent installment is quite interesting about 50mm lenses and contains a
>bit of a history lesson.
>
>https://www.dpreview.com/news/9236543269/why-are-modern-50mm-lenses-so-damned-complicated
>
>As the Zuiko 50's are indeed double gauss-ish, his comments apply.
>
>https://esif.world-traveller.org/om-sif/lensgroup/50mmf12.htm
>
>As he mentions many aberrations don't improve all that much stopping down such
>as 3rd and 5th order astigmatism, elliptical coma and others.
>
>https://www.lensrentals.com/blog/2016/01/what-actually-happens-when-you-stop-down-a-lens/
>
>This results in 50mm double gauss lenses of this era with odd situation that
>a cheaper slower 50mm can outperform the expensive 50/1.2 stopped down.
>Roger at LR:
>
>
>"Unfortunately, that's not how it worked, at least not for double gauss lenses
>wider than F1.4. Stopping down made them sharper, of course, especially in the
>center.
> But away from center they never got wicked sharp; they got OK."
>
> That is no longer the case with very recent 50's depending on design though.
>
>Is that the case with the OMZ 50's? I can't really tell from Gary Reese data
>and I don't have a 50/1.2. Moose was probably correct about that lens that
>unless you really need 1.2, for something, why bother? Still a cool lens.
>The OMZ
>50/2 macro seems to test better (Gary Reese) stopped down than the 50/1.4
>even but not sure that was statistically significant.
>
>More 50's than know what to do with, Mike
This is nifty to know.
I had the OM 50/1.2 and the 50/1.4. It was cool to hold in the hand but the 1.8
or the 50/2 macro was my preferred. Now I know. And I'll go with the Moose why
bother. I have the CV 50/2 that does well. The modern 50's are quite big now.
I'd rather have a 85 or 100 in that size. And 35mm vs 50mm...
WayneS
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