Re: Tamron Zoom Shootout (28-75, 28-200, 35-150 EF, and 70-180)
So I am in too far now... I went back to the same park and shot the same tripod/infinity tests today (as well as handheld/midrange tests if I need more data points to make conclusions after doing this) to compare the a7riii/28-200 vs the APSC equivalent a6400/18-135 for my own satisfaction. Here are the tripod/infinity tests shot at f8 (I know the depth of field for FF and APSC are different for a given aperture/focal length, but I kept the exposures the same), ISO 100, and 1/60 second to get a good exposure within +/-1 EV of ideal for all focal lengths from 28-200mm. the framing is almost exactly the same as the initial tripod/infinity tests and the camera/tripod were never moved once set up (only zoomed into the scene). As before, no editing was done other than the manufacturer lens profiles and default sharpening applied to the RAW file when imported by capture one 12. the screenshots were downsized in affinity photo to 1600px long edge this time to keep the jpeg quality higher but still staying within the forum's posting limits for size.
I have tried my best to make the magnification the same between the 42mp a7riii and 24mp a6400, but it was not perfect and it makes a difference whether I compared the a7riii at 200% to the a6400 at 300% (the closest match, but slightly more zoomed in and demanding of the APSC image) vs 200% (always made the APSC look more favorable than at 300%). I will post one example below to demonstrate what happens when I compare the FF at 200% vs the APSC at 300% or 200% so you get an idea of how it changes thing knowing that I chose to just go with 200% FF and 300% APSC magnification because it came closest, but definitely handicapped the APSC somewhat. Just take that into consideration when making conclusions of your own.
The first image is the APSC at 300% vs. FF at 200% and the second image both APSC and FF are at 200%
Jun 28, 2020 at 10:02 PM
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