Chester87 wrote: Jason_Brook wrote:
Do the test again with something like a barcode on a box; make sure Chromatic Abberation correction is turned OFF in LR. Seeing chromatic abberation is key to fine tuning an f/1.4 lens. I see it in most of those pictures.
I\'ve said it many times on here:
Green = back focusing
Purple = front focusing
thank you for your advice. i\'d do it again. until now, what i do with AFFT is look at how sharpness scale move with AFFT by my eyes.
Do you have any instruction for that?
CA is unique by color when it\'s back or front focused, and in my opinion is the easiest way to fine tune a lens. Obviously CA is tremendously worse on f/1.4 lenses, but it makes it that much easier. Get something extremely high contrast like a barcode label, put it in strong lighting to promote CA. If your test subject has green CA, you\'re back focusing. If it\'s purple, you\'re front focusing. There really is no scientific process/instruction to it. You\'re just looking to see what color the CA is. If there\'s none, it\'s dead on.
This is not my photo, but should help illustrate what\'s going on
Feb 24, 2015 at 08:47 PM
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