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Bracketing in continuous mode: subject distance

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Offline pigeonhill

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Re: Bracketing in continuous mode: subject distance
« Reply #10 on: 04 / February / 2020, 13:56:38 »
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@reyalp

Many thanks for the insight.

As I hinted, I wonder if we could consider at least adding in the link to custom timer.

That is refocus as normal if custom timer not in use, but use the knowledge of knowing the custom timer number of brackets to not refocus after the last bracket.
« Last Edit: 04 / February / 2020, 14:09:43 by pigeonhill »
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Offline reyalp

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Re: Bracketing in continuous mode: subject distance
« Reply #11 on: 04 / February / 2020, 15:28:37 »
Quote from: pigeonhill on 04 / February / 2020, 13:56:38
As I hinted, I wonder if we could consider at least adding in the link to custom timer.

That is refocus as normal if custom timer not in use, but use the knowledge of knowing the custom timer number of brackets to not refocus after the last bracket.
I'm not clear what real problem this is supposed to fix. I understand the values didn't end up where you expected them, but does it actually break something? Are you relying on the subject distance being at a particular value after bracketing is done?

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But, after n brackets, ie n specified in the customer timer, the exposure is reset to the base exposure at the start.
A somewhat pedantic clarification: Except for the recent ISO mode fix, CHDK does not reset anything at the end of bracketing. It just happens that the Canon firmware resets them in the next half press cycle, either from AE values or USER_ propcases.
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Offline pigeonhill

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Re: Bracketing in continuous mode: subject distance
« Reply #12 on: 04 / February / 2020, 15:57:15 »
@reyalp

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Are you relying on the subject distance being at a particular value after bracketing is done?

Yes, that’s right.

But I’ll rethink things  ;)

Cheers

Garry
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Offline reyalp

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Re: Bracketing in continuous mode: subject distance
« Reply #13 on: 04 / February / 2020, 16:47:16 »
Quote from: pigeonhill on 04 / February / 2020, 15:57:15
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Are you relying on the subject distance being at a particular value after bracketing is done?

Yes, that’s right.

But I’ll rethink things  ;)
To be clear, I'm not totally against changing it, but it's helpful to know if it's stopping you from doing something, or just unintuitive behavior.

Since you're doing this from script, it seems like there should be other options that might be more reliable overall.
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Offline pigeonhill

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Re: Bracketing in continuous mode: subject distance
« Reply #14 on: 04 / February / 2020, 17:04:10 »
@reyalp

I'm specifically trying to exploit the bracketing in continuous mode.

I have an idea to turn this sd bracketing 'feature' to my advantage, as the focus will be less than where the next image should be. Thus it will introduce a focus overlap.

I'll play around with the equations and see what I can do with things as they are.

Cheers

Garry
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