DoF may not exist...

Started 3 months ago | Discussions thread
JimKasson
MOD JimKasson Forum Pro • Posts: 35,273
Done and dusted
2

Greg7579 wrote:

Erik, it is time. Fuji, it is time. Forget the math and CoC and do the work by shooting in a lab and in the wild and stating when the pixels start to lose it. Please.

I did that a year ago, at your request. You have ignored my recommendations. Here's a data point: with a 45 mm lens on a GFX 100x at f/5.6, focused at 100 meters, the threshold of critical focus at 1:1 is at 50 meters. Critical focus in that case extends -- just barely -- all the way to infinity.

I asked to you check and see if you agree. I gave you a test to perform that will take you half an hour that should be dispositive. You ahve not done it.

Someone (Fuji) please do DOF tables for all of the GF lenses and please do not even mention CoC in them. Just do the tables and state the distances at all the apertures for each lens at each focal length of the zooms.

I can do that once you verify that what you think is the threshold of critical focus is what I think the threshold of critical focus is.

That's a lot of stuff, but easy to plug in on an app.

Once you verify my findings -- which I've tested in the field -- I can tell you how to set up most any DOF calculator to do what you're asking.

You asked -- a long time ago, not just today. I answered. I did a fair amount of work to verify my answer (which, by the way, works for the a7RIV, too). I asked you to see if you agree with my answer. You haven't done that. The ball is in your court.

Jim

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