Autofocus correction for a modified 350D with no IR filter? - Script Writing - CHDK Forum
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Autofocus correction for a modified 350D with no IR filter?

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Offline astrojucar

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Autofocus correction for a modified 350D with no IR filter?
« on: 19 / March / 2013, 05:48:00 »
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I've got a Canon 350D with the internal IR filter removed (for astronomical use). One of the side-effects of that, is that autofocus doesn't work anymore, because of the removed glass from the optical path. Some people replace the IR filter with other clear glass to retain autofocus. I didn't.  :-[

I wonder if there's any way of adding an "autofocus offset" with a CHDK script. Something like

x=get_focus()
set_focus(x+10) ::)

I have never written a CHDK script in my life and I'm kind of lost.

Thanks!
« Last Edit: 19 / March / 2013, 05:54:18 by astrojucar »
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Offline blackhole

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Re: Autofocus correction for a modified 350D with no IR filter?
« Reply #1 on: 19 / March / 2013, 07:21:10 »
CHDK does not support DSLR cameras, the only solution is like what you've written mounting transparent optical glass. You have to purchase ready-made, look at sites with astronomical equipment.

EDIT:added link for filter
http://www.teleskop-express.de/shop/product_info.php/info/p256_Baader-Astrophoto-Conversion-Filter-for-Canon-EOS-350-20-30.html
« Last Edit: 19 / March / 2013, 08:18:08 by blackhole »
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