The AFMA myth.

Started 5 months ago | Discussions thread
poppyjk Contributing Member • Posts: 753
Re: The AFMA myth.

ThrillaMozilla wrote:

poppyjk wrote:

Distinctly Average wrote:

First your test shots, maybe try with a sloped ruler and a proper target and you will see what the actual difference it makes. Why do you think the focus char tools and focus pyramids are not 6-8 feet deep? Maybe have a read of this -

I beg your pardon! Are you denying the reality that my sample photo focus changes between zero and -20 is about 6 feet?

I don't think anybody would be surprised that that could be the case. But actually, I don't think you can tell what the camera focused on, since both the branch and the wall are within the focusing spot. That could be the cause of your problem. Like the man says, you need a proper target.

And I'm sorry you had trouble adapting a commercial target to a long tele. Not my problem.

I intended to demonstrate that making AFMA adjustments of -10 and -20 moved the 'in focus' portion of the photo forward by several feet and taking out of focus the branch and/or bricks under the red focus box.

That is obvious to me. Is it not obvious to you?

Do you believe the OP is correct that AFMA changes only move the focus by a few millimeters rather than a few feet at 175 feet and 400mm?

I did not have trouble adapting a commercial target to a long tele.  It was certainly better than nothing or guessing.  I'm just stating my experience that an improvement on that is an actual 'at distance' AFMA meticulous calibration.

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