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G12 - Subject Distance Bracketing mode query

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Offline msl

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Re: G12 - Subject Distance Bracketing mode query
« Reply #10 on: 14 / November / 2011, 08:25:46 »
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I would not be able to help you because of my lack of understanding of the focus settings/zoom range, but recently I have been working with manual focus in the GUI's (ptpcamgui and sdmcongui),
Sorry, a offtopic question: What is sdmcongui?

Thx msl
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Re: G12 - Subject Distance Bracketing mode query
« Reply #11 on: 14 / November / 2011, 10:54:43 »
What is sdmcongui?

A little application to simplify using an SDM version of ptpcam.


Re: G12 - Subject Distance Bracketing mode query
« Reply #12 on: 14 / November / 2011, 11:01:42 »
Try this test:
- enable focus bracketing with +6000mm settings
- set the camera to manual focus, focus on something very close to the lens (<10cm)
- take 3 shots in continuous mode

You should be able to easily see the focus change in these shots.

Phil.

Thanks Phil,

I have now tried it with all manner of different permutations e.g. Bracket Value of 100 and a Value Factor of 100 focussed down to around 7cm and all shots (20+) remain focussed on the starting position.

I think I'll just have to resign myself to the fact that it won't play ball with my camera. A shame as a lot of my work involves stacking 30+ images from 10cm through to 3.0m.

Re: G12 - Subject Distance Bracketing mode query
« Reply #13 on: 14 / November / 2011, 11:26:35 »
I think I'll just have to resign myself to the fact that it won't play ball with my camera.

I do not believe that.

Phil is a G12 user and it works for him.

He will be fast asleep right now.


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Offline fe50

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Re: G12 - Subject Distance Bracketing mode query
« Reply #14 on: 14 / November / 2011, 12:33:57 »
...and all shots (20+) remain focussed on the starting position.
Any chance you've set the Disable Overrides option in the CHDK menu ? ;)

Re: G12 - Subject Distance Bracketing mode query
« Reply #15 on: 14 / November / 2011, 13:46:05 »
...and all shots (20+) remain focussed on the starting position.
Any chance you've set the Disable Overrides option in the CHDK menu ? ;)

I've tried with Disable Overrides in each of the On/Off/Disable states to no apparent effect.

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Offline philmoz

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Re: G12 - Subject Distance Bracketing mode query
« Reply #16 on: 14 / November / 2011, 14:30:56 »
Try this test:
- enable focus bracketing with +6000mm settings
- set the camera to manual focus, focus on something very close to the lens (<10cm)
- take 3 shots in continuous mode

You should be able to easily see the focus change in these shots.

Phil.

Thanks Phil,

I have now tried it with all manner of different permutations e.g. Bracket Value of 100 and a Value Factor of 100 focussed down to around 7cm and all shots (20+) remain focussed on the starting position.

I think I'll just have to resign myself to the fact that it won't play ball with my camera. A shame as a lot of my work involves stacking 30+ images from 10cm through to 3.0m.

Did you try the specific test I posted - on my camera I can cleary see the focus difference in this test (I can also hear the camera re-focus between shots). When I do this test I have something close to the camera (5-10cm) and something is the distance (>5m). I manually focus on the close object which is then in focus for the first shot, and then the far object is in focus for the second.

A bracket value of 100 with a fill factor of of 100 won't work.
The allowed range of values is from 68 to 65535, where 65535 = infinity.
100x100 = 100,000 which would try to push the focus outside the allowed range.

Also make sure the 'Override Sub. Dist. Value' setting is off (Value Factor = Off) in the Extra Photo Operations menu. Only have the override in the 'Bracketing in Continuous Mode' turned on.
If you enable the main subject distance override it will take precedence and the bracketing override won't work.
(This should probably be fixed so the main override only sets the starting value and the bracketing still works.)

Phil.
CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
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Re: G12 - Subject Distance Bracketing mode query
« Reply #17 on: 23 / November / 2011, 03:15:39 »
Did you try the specific test I posted - on my camera I can cleary see the focus difference in this test (I can also hear the camera re-focus between shots). When I do this test I have something close to the camera (5-10cm) and something is the distance (>5m). I manually focus on the close object which is then in focus for the first shot, and then the far object is in focus for the second.

A bracket value of 100 with a fill factor of of 100 won't work.
The allowed range of values is from 68 to 65535, where 65535 = infinity.
100x100 = 100,000 which would try to push the focus outside the allowed range.

Also make sure the 'Override Sub. Dist. Value' setting is off (Value Factor = Off) in the Extra Photo Operations menu. Only have the override in the 'Bracketing in Continuous Mode' turned on.
If you enable the main subject distance override it will take precedence and the bracketing override won't work.
(This should probably be fixed so the main override only sets the starting value and the bracketing still works.)

Phil.

Sorry guys, I'm still struggling with this and I've become a bit confused with some of the info.

I can't work out how to do the +6000mm settings as the Subj.Dist Bracket Value only goes from 0-100 and you've advised to leave the Value Factor off.

To summarise the settings I've tried (among many) these are the parameters I've most recently tried without effect@

Subject Distance Bracket Value = [20]
Value Factor =

Bracketing Type

Clear Bracket values on Start [Unchecked]

Back onto the Extra Photo Operations Menu
Disable Overrides [Off]
Include AutoISO & Bracketing [Unchecked]

I then press the shutter button until the script is finished; go out of the <Alt> menu and using M mode have the Continuous shooting enabled, MF on to the closest point.

I've tried using both the shutter button and the remote release and I can't hear any re-focussing go on and as long as I've got the shutter pressed the camera just keeps continuous shooting of the nearest point.

Thanks,

A


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Offline philmoz

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Re: G12 - Subject Distance Bracketing mode query
« Reply #18 on: 23 / November / 2011, 03:32:05 »
There are two subject distance override values and value factors.
The first is in the 'Extra Photo Operations' menu - leave this one turned off.
The second is in the 'Bracketing in Continuous Mode' menu - turn this one on.

To do the +6000 test, set the override value to 60 and the value factor to 100 in the 'Bracketing in Continuous Mode' menu. Make sure the other one is off.

Phil.
CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)

Re: G12 - Subject Distance Bracketing mode query
« Reply #19 on: 23 / November / 2011, 03:46:04 »
Thanks for bearing with me on this Phil. I've done exactly as you've described above and still no joy.

 

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