Yes, the test result is only marginally acceptable，however, I will still insist on using Haida, because I prefer the operation mode of Haida to Kase, and I will continue to test the night lights
Fred Miranda wrote: olalafoto wrote:
Haida rear filter ND sharpness comparison:
Center focus at infinity, 5500K, ACR13.3（only enable vignetting correction）
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field curvature comparison：
manual focus, based on electronic scale in camera display
Perfect!!! These are expected results from the 0.5m Haida rear filter. It's a bit worse than what I'm seeing with the 0.3m Kase.
With the latter at f/5.6, the filtered crops matches the unfiltered one which is not quite the case when compared to the Haida. There is a big induced field curvature, which is very noticeable at wide apertures.
This shows that rear filters + fast ultra wide lenses is not a good idea unless one is shooting at f/8 or smaller apertures. With the big zooms (Sigma and Sony), the Kase's induced field curvature gets masked by ~ f/4 where they are optimal.
Jun 09, 2021 at 09:29 AM
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