Support old sigma lenses in DSLR - DSLR Hack development - CHDK Forum
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Support old sigma lenses in DSLR

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Offline sterr

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Support old sigma lenses in DSLR
« on: 04 / September / 2012, 01:19:34 »
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I use CHDK long time but never use some extended functions, as maximum is AEB script. But some problem in the world of DSLR canon not solved. It is lenses of old film cameras. As SIGMA, Tamron etc. Perfect quality, but protocol of controlling apperture is wrong. Shutting only on full open diaphragm. I know that it's really possible solve in CHDK, because I see is source lens parameters read. It's will be more effective CHDK update than all do before. Main problem is get old commands for old lenses for change it protocols in CHDK and make compatible with new DSLR Cameras.
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Offline crazyklaus

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Re: Support old sigma lenses in DSLR
« Reply #1 on: 18 / September / 2012, 15:43:56 »
http://www.dslr-forum.de/showthread.php?t=649529

this is a 49-page discussion thread in german. these guys have developed a hardware hack that corrects the issue.
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