Transfocal PSFs for the GF 110 and GF 80

Started 2 months ago | Discussions thread
ForumParentFirstPrevious
Flat view
JimKasson
MOD JimKasson Forum Pro • Posts: 34,012
Transfocal PSFs for the GF 110 and GF 80
3

I'm playing with plotting the point spread function for the GF lenses as they are focused and defocused. I'm using the PSF data returned by MTF Mapper, which I don't understand very well (can you help me out here, Jack? What are the units of distance that the 256 points perpendicular to the focal plane represent?)

Anyhow, here are a couple of images I found interesting, with the GF 110 and the GF 80, both wide open.

80 at f/1.7

110 at f/2

Focus distance runs from top to bottom, with front-focused at the top and back-focused at the bottom. The colors are highly approximate; I just assigned the raw channels to their respective sRGB channels. The weirdness at the bottom of the 110 image is a focus bracketing glitch. I'm not sure what the units are from side to side; that's what I asked Jack about.

The LoCA of the 80 is apparent.

Anybody want to see more of these?

-- hide signature --
 JimKasson's gear list:JimKasson's gear list
Nikon Z7 Fujifilm GFX 100 Sony a7R IV Sony a9 II +1 more
ForumParentFirstPrevious
Flat view
ForumParentFirstPrevious
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow