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Topics - JoaquinS

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Modules Development / adding AFMA feature (Rebel)
« on: July 16, 2019, 07:29:23 PM »
Hi, I'm new to the forum, found that searching to ad AFMA to my T5i, since I got a new fast lens and it misses focus by a few mm and that's enough to focus on the nose instead of the eyes.

I haven't found anything, but programming for this kind of devices is one of my skills from my degree and some of my day jobs. If there already is something please let me know.

I haven't decided yet if I'll go with a module or a Lua script, the later seems simple enough, but I'm more familiar with C and as something running continuously in the background seems a better choice.

First goal would be a program to set it manually, single point correction to test the procedure, second to search to build a table for lens, focal length and focus distance and the module choose from there, all editable in camera. The last step would be some sort of calibration assistance or automation, but as something that you do once and forget, even if painful to do, making the module just for me won't be likely to happen, maybe if there's enough interest it could be added later.

The idea would be to use the autofocus function (in viewfinder mode) and then make n steps back or front to correct for the error stored in the memory.
For the second part, start reading the lens signature, then the focal distance and finally do the focusing as in the simple version, but this time choosing the right value from a table corresponding to lens, focal length and focus distance.

Any feedback appreciated, I make this post to introduce myself, to put the idea out and see if there's something I'm missing before starting doing something that's already been made.


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