Landscape Focus Bracketing Script - page 9 - Completed and Working Scripts - CHDK Forum

Landscape Focus Bracketing Script

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Re: Landscape Focus Bracketing Script
« Reply #80 on: 11 / April / 2019, 15:03:25 »
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Just did some testing and I think I don’t fully understand modes.


I just did a test from Av mode.


If I just switch between Av and M mode, the Av exposure looks ok and the shutter speed is ok. But if I switch from Av to M the shutter speed is too fast, ie image dark.


What I need to do is work out how to come into the script from, say, Av mode and get the right Av set shutter speed.


More thinking required I think.
« Last Edit: 11 / April / 2019, 15:07:32 by pigeonhill »

Re: Landscape Focus Bracketing Script
« Reply #81 on: 11 / April / 2019, 15:24:16 »
@c_joerg

If you have the time, maybe you can try this version and see if it fixes your problem?
https://gist.github.com/pigeonhill/3fe9e52621db7149eb3505bd60b395cb
Fingers crossed  ;)

Re: Landscape Focus Bracketing Script
« Reply #82 on: 12 / April / 2019, 12:11:02 »
If you have the time, maybe you can try this version and see if it fixes your problem?

Looks OK  :)
M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd

Re: Landscape Focus Bracketing Script
« Reply #83 on: 12 / April / 2019, 12:38:54 »
@c_joerg

 :D
Many thanks for testing.

The 'issue' was related to PowerShot deficiencies and me not fully appreciating them.

PowerShot Av mode is limited to 1s Tv, thus you should never use Av mode with a Tv reported value of 1s, as you don't know if it is 1s.

Also if you switch to M mode from Av, the Tv value isn't transferred to M mode by Canon.

Anyway, hopefully the script is now solid.

BTW I did a test shot on the way home that gives a flavour of the script's capability, although I should have focused a little closer to the camera.  Also, I used f/8 rather than the optimum aperture of f/5.6.

Once again, thanks for all your support and feedback.

Cheers

Garry
« Last Edit: 13 / April / 2019, 01:40:55 by pigeonhill »


Re: Landscape Focus Bracketing Script
« Reply #84 on: 13 / April / 2019, 07:45:12 »
BTW I did a test shot on the way home that gives a flavour of the script's capability, although I should have focused a little closer to the camera. 
Such shots can only be done in absolute calm, right?
Also, I used f/8 rather than the optimum aperture of f/5.6.
Here is a script where you can find the optimum aperture. Most of my P&S with small Senor had there optimum already with open aperture.
https://chdk.setepontos.com/index.php?topic=13532.30


About focus bracketing strategies:
From -DelX to +DelX (around the current position) might be a good range…

M100 100a, M3 101a, 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), 2*S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd

Re: Landscape Focus Bracketing Script
« Reply #85 on: 13 / April / 2019, 09:15:12 »
@c_joerg

'Best' here means 'best' balance between defocus blur and diffraction blur. Plus, of course, this then needs to be balanced out with intrinsic lens quality.
Which is why F/5.6 on G7X is pretty good for 'best' quality, over all.
By the way have added in the -Del to + Del option: https://gist.github.com/pigeonhill/3fe9e52621db7149eb3505bd60b395cb
Will update CHDK words this weekend.
Cheers
Garry

 

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