Preventing re-evaluating on each photo to increase photo rate

heinduplessis

4

« on: 17 / March / 2014, 08:11:43 »

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I've been using chdk for a few years and I love it. I mostly use it for the intervalometer scripts to take pictures from my drone. I use a Canon Powershot S100.

I've preset aperture size, iso, focal length and shutter speed. Yet, before every photo, it appears the camera is re-evaluating the scene before the shutter.

I was hoping it would be possible to skip this step, increasing the number of photos per minute.

Is it possible to turn of the camera's evaluation before every take?

Many thanks

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waterwingz

11913

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #1 on: 17 / March / 2014, 08:20:42 »

From your description, it sounds like it might be trying to focus before each shot? You can use set_aflock() to prevent that (or manually enable AFL or MF mode from the Canon menus/keyboard).

This might be of interest as well : http://chdk.wikia.com/wiki/Fast_Shooter_Intervalometer

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Ported : A1200 SD940 G10 Powershot N G16

heinduplessis

4

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #2 on: 17 / March / 2014, 09:41:32 »

Thank you so much, I'll give it a try.

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waterwingz

11913

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #3 on: 17 / March / 2014, 09:53:58 »

Quote from: heinduplessis on 17 / March / 2014, 09:41:32

Thank you so much, I'll give it a try.

You might want to add a set_aelock() function call too. If you are presetting exposure parameters with the CHDK override menu, the camera will still attempt to set exposure before CHDK overrides it. If you have set your camera into M mode and are doing it that way, ignore this advice.

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Ported : A1200 SD940 G10 Powershot N G16

heinduplessis

4

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #4 on: 19 / March / 2014, 02:28:50 »

I am using the camera in M mode, but it still seems to focus and adjust before every shot. I'll try the fast intervelometer and the aelock. Thanks again.

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waterwingz

11913

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #5 on: 19 / March / 2014, 08:19:02 »

Quote from: heinduplessis on 19 / March / 2014, 02:28:50

I am using the camera in M mode, but it still seems to focus and adjust before every shot. I'll try the fast intervelometer and the aelock. Thanks again.

If you are in M mode the aelock() won't make any difference. From what you say, set_aflock() will.

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Ported : A1200 SD940 G10 Powershot N G16

heinduplessis

4

Re: Preventing re-evaluating on each photo to increase photo rate

« Reply #6 on: 02 / April / 2014, 15:56:01 »

I disabled the preview (faceslap) and now she's flying at a photo every second!

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