On SX530HS, If I zoom > %70 manually and invoke half-press to get focus sharp, image looks good in LCD. When script does "AF Lock" function, I lose focus. If I zoom <= %70 manually, invoke half-press and get sharp focus, when script does "AF Lock", focus remains sharp.
Should the script's notion of zoom position match what I manually zoom out to?
If script says "Focus @ Infinity Mode=AFL", must I also set Subject Distance Override to Inf?
Sorry for not getting this, I'm obviously confused trying to relate AF, MF, and Subject Distance Override.
Further confused because the M10 has true MF, eg I turn the barrel on the lens and subject is focused or not. But M10 also has AF; half-press and it does it's thing.
I also might have time to build a bahtinov mask so that I get perfect focus.
Quote from: axman on 17 / August / 2017, 15:19:49On SX530HS, If I zoom > %70 manually and invoke half-press to get focus sharp, image looks good in LCD. When script does "AF Lock" function, I lose focus. If I zoom <= %70 manually, invoke half-press and get sharp focus, when script does "AF Lock", focus remains sharp.If you've read my various rants and efforts to get CHDK to focus at a set distance you'll know my frustration. On one camera, it will work well. On another camera (same model & firmware) it won't. In short, if Canon does not support MF natively on the camera, it's just plain dumb luck if the CHDK hacks work well or not.
QuoteShould the script's notion of zoom position match what I manually zoom out to?I'm not quite sure what you are asking here? If you use the "Zoom position" setting in the script parameters, it will try to set the zoom to a percentage of the full zoom range determined by the % value of the parameter you enter. But there is actually a finite number of discrete zoom steps on every camera, so the actual position will be approximately the percentage value you requested.
QuoteSorry for not getting this, I'm obviously confused trying to relate AF, MF, and Subject Distance Override. Good question. AF means "auto focus". If you select AFL it means the camera will autofocus once and then leave the focus at the resulting setting. MF means "Manual Focus". When using MF you get to select the focus distance. The term "Subject Distance Override" is something CHDK uses to describe a distance that CHDK will set the focus at, regardless of what the Canon firmware wants the focus distance to use. Understanding which focus distance will be used takes a little thinking.
QuoteFurther confused because the M10 has true MF, eg I turn the barrel on the lens and subject is focused or not. But M10 also has AF; half-press and it does it's thing.If you have true MF, I would not even think about using CHDK SDO/AFL/MF. Yes - if you use CHDK's ability to set that and it actually works for your individual camera, then you have one less thing to remember to do once you start shooting. But if you can remember to set the camera's native focus to infinity, you have one less thing to go wrong if the CHDK script does not work as expected.
Ahh Haa! Thanks for that link. Interesting and educational for me, trying to follow your thinking when faced with camera behavior that should be reproducible, but isn't.
Ok, now I get what the CHDK parameter SDO does, thanks. I think part of my confusion (apart from age and general blundering tendency) is the word "AFLock", and where it's set, and what it's called in different cameras.
Packing the truck is underway. There will be pics and more thank-you's next week.
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