'Enable Optical Zoom' in 'Photo operations' - Feature Requests - CHDK Forum
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'Enable Optical Zoom' in 'Photo operations'

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Offline mary

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'Enable Optical Zoom' in 'Photo operations'
« on: 30 / July / 2012, 11:20:13 »
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Hi,

Enabling optical zoom when taking long exposures would be very interesting, because it would make possible to take some art photos. That option would 'emulate' having a physical zoom control like you normally have on DSLR's lens. Currently, zoom in/out buttons are blocked when image is being taken - is it possible to unblock them and create an option similar to 'Enable Optical Zoom' in 'Video operations'?

Examples of images taken with zoom in/out effect can be found by googling for 'Images for picture zoom effect'.
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Offline dbldash

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Re: 'Enable Optical Zoom' in 'Photo operations'
« Reply #1 on: 30 / July / 2012, 11:30:50 »
Hi :)

An explanation of doing this using a script is given here: http://chdk.setepontos.com/index.php?topic=2518.0. This is done fairly simply by setting the camera to a long exposure, then running the script which releases the shutter then zooms as normal during the exposure.

Quote from: mary on 30 / July / 2012, 11:20:13
Currently, zoom in/out buttons are blocked when image is being taken - is it possible to unblock them and create an option similar to 'Enable Optical Zoom' in 'Video operations'

I imagine it's probably possible to react to button presses during an exposure, but I'll have a try later to check. If this can be done then it should be fairly straightforward to add this functionality in C.
« Last Edit: 30 / July / 2012, 11:33:29 by dbldash »
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Offline mary

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Re: 'Enable Optical Zoom' in 'Photo operations'
« Reply #2 on: 30 / July / 2012, 12:19:24 »
What's more, the same code used in 'Enable Optical Zoom' option in 'Video operations' can be reused here -  I hope  :D
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Offline waterwingz

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Re: 'Enable Optical Zoom' in 'Photo operations'
« Reply #3 on: 30 / July / 2012, 13:07:55 »
There was a conversation about this at the start of the year :

http://chdk.setepontos.com/index.php?topic=7286

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Offline reyalp

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Re: 'Enable Optical Zoom' in 'Photo operations'
« Reply #4 on: 30 / July / 2012, 15:50:48 »
Quote from: mary on 30 / July / 2012, 12:19:24
What's more, the same code used in 'Enable Optical Zoom' option in 'Video operations' can be reused here -  I hope  :D
No. I expect not, but maybe.

You can already do this with a script. Since this is may be a dangerous thing for the camera (lens mechanics might not be in a safe state to move during exposure) I don't think it should be a standard CHDK feature.
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