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p.9 #17 · p.9 #17 · Light Lens Lab (LLL) replica lenses discussion & image thread | |
highdesertmesa wrote:
At infinity and f/8, I'm not seeing mid-frame weakness, I only see some sharpness falloff toward the frame edges, but that is only noticeable at 200% on the 24mp SL2-S. At f/2, it's the same, but of course the falloff toward the edges happens sooner. But I see nothing were the edges and center are sharp with a weak mid-frame. That's all at infinity, as I don't usually test sharpness across the frame at close distance, since I usually shoot wide open when closer to the subject.
I'll give the FC test a try so if nothing else we can see how our copies compare at close distance. I'm definitely not seeing wavy field curvature at infinity. Have you tried moving focus at f/8 slightly inward? For me, that sharpness up f/8 considerably. Otherwise, if I leave f/8 at the hard stop, infinity sharpness at f/8 looks actually a little softer than f/2.
Yes, if I just add a very, very little sharpening in C1, the f/2 infinity shot looks just like the f/8 in the center. Of course, adding some sharpening to the f/8 images still makes it better than the f/2, but not by as much as I see with the defaults. Keep in mind that these are very casual shots, and my f/8 shot was done at a much slower shutter speed. But the IBIS of the SL2-S is pretty good, so I don't think a tripod would have benefitted the f/8 shot all that much at 1/80th sec.
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I don't use the lens a lot for infinity shots so haven't closely evaluated it for that, but I now habitually intentionally front focus it when stopped down more than f/2.8. So effectively doing the same as you.
Thanks in advance if you're able to do the field curvature test shots. You don't have to make it into a gif if that's a hassle. Even just seeing f/2, 4 and 8 would be informative.
With my copy, it's notably lower contrast wide open and picks up at f/2.5 and again at f/2.8. From what I recall from the long RFF pre-order thread, LLL tweaked the design to intentionally drop wide open contrast. Maybe they changed their mind about this at some point since because your copy doesn't appear to show this.
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