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Posted: 11/26/2018 6:18:38 PM EST
I thought I'd pass this on. It's a moire fringe technique to check for front/back focus. Pull the 1000x1000 image up on your screen, center your camera on a tripod looking at the screen, and adjust your fine tune until the pattern looks correct. Front/back focus will look weird, and if you're high/low/sideways you'll get odd patterns showing you to adjust the centering of your camera vs display.

http://www.northlight-images.co.uk/camera-af-microadjustment/#AF_test_image

Correct focus and then front focus:

Link Posted: 11/26/2018 7:55:41 PM EST
Link Posted: 11/26/2018 9:38:48 PM EST
Here I was thinking you took those shots and wondering how the sun could possibly be lighting up those curtains.

But I'll have to try this out.
Link Posted: 11/26/2018 9:56:18 PM EST
Looks interesting. I've always used the focus ramp test. At the fastest aperture it's pretty darned effective.
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