Индустар-61Л/З-MC (Industar-61L/Z-MC) 50/2.8:
This is the first lens I ever bought. Before that, I got lenses for free.
I used the lens quite often on my Pentax *ist Ds. In fact, it was the main lens on this DSLR for the first time.
It's much more usable than the Индустар-50/50-2 (Industar-50/50-2), but I can't call the image quality very good. Although this copy is good.
Now I use the Pentax K 50/4 Macro (also Tessar type, 4 elements in 3 groups) instead.
The Pentax K 50/4 Macro is better both optically and mechanically, it gives more magnification (up to 1:2).
(at the minimum focusing distance)
And the difference between f/2.8 and f/4 doesn't matter for the task at hand.
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