Build #51-462 Override Aperture? - AllBest's Builds - CHDK Forum

Build #51-462 Override Aperture?

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Build #51-462 Override Aperture?
« on: 10 / August / 2008, 08:54:20 »
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I'm not seeing this in my menu for extra photo operations, is there some sort of trick to getting that to show up?  I'm sorry I've searched and searched and now I'm begging :D



Using "Show Build Info" my build says:

CHDK Ver: allbest, #51-462
Date: Aug 2 2008
Time: 02:40:33
Camera: ixus860_sd870
FW Vers: 100c


Help?


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Offline Hacki

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Re: Build #51-462 Override Aperture?
« Reply #1 on: 10 / August / 2008, 08:57:58 »
The ixus series doesnt have a real diaphragm, just a ND filter to 'simulate' one.

Though, you can control the ND filter.

Re: Build #51-462 Override Aperture?
« Reply #2 on: 10 / August / 2008, 09:09:54 »
Hey thanks Hacki - ok sooooooo I'm a little dum still (!!!) I see the option for the ND Filter - but how will that work?  When I enable it, I get longer shutter speeds (nice) but how can I cause the ND filter to give me f/8 - or are you saying that I shouldn't worry cuz it's all the same on the sd870 ?

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Offline Hacki

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Re: Build #51-462 Override Aperture?
« Reply #3 on: 10 / August / 2008, 09:23:26 »
Hey thanks Hacki - ok sooooooo I'm a little dum still (!!!) I see the option for the ND Filter - but how will that work?  When I enable it, I get longer shutter speeds (nice) but how can I cause the ND filter to give me f/8 - or are you saying that I shouldn't worry cuz it's all the same on the sd870 ?

Exactly. No diaphragm, no f-stop. Ixus series does only have 2 'f-stops' (they arent really f-stops)  - ND filter in, and ND filter out.

« Last Edit: 10 / August / 2008, 09:25:51 by Hacki »


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Offline Coutts

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Re: Build #51-462 Override Aperture?
« Reply #4 on: 11 / August / 2008, 12:33:03 »
a better way to say it, the Ixus series cameras have a fixed F/2.8 aperture. this is because with such small cameras, you have to sacrafice somethings, in this case its an adjustable aperture diaphram. the nd filter clicks on in bright lighting conditions to simulate an F/8.0 aperture, so that you can capture pictures in bright lightning conditions. Thats what i hated about my SD1000 i used to have, you just can't get creative and use depth of field in shots, you can however simulate it in photoshop if you know how.

now i have an A590IS, its got an aperture (finally i have a camera with one!!), and also manual focus (old camera lacked that) so its alot better, but no firmware builds available for it yet, but they're in development ;-)
Canon 5d
Canon 50mm f/1.8
Sigma 24mm f/1.8

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