Originally Posted by
Roger Krueger
One of the things I've noticed is that the length of spikes on in-scene lights depends on how far you're stopped down--my 35mm Canon 24/1.4 at f6.3 has serious spikes, my Mamiya Universal 50/6.3 with a similar (21mm equiv.) field of view has zero spikes at f6.3.
I would assume less-directly-measurable stray light issues would also suffer on faster lenses--the bigger front elements gather light whether you're using it or not, and some of it is bound to go astray.
When I tested my Mamiya Universal 250s the 250/8 Tessar was considerably sharper at all apertures than either of their sibling 6/4 250/5's I tested. (btw, any clue what design the 250/5 is? I'd always kind of assumed a Sonnar, given that the other premium lenses in the Uni setup were Biogons and a Planar, but the diagram doesn't look right.)
But the 100/2.8 Planar smokes the 100/3.5 Tessar, especially on CA and below f/5.6.
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