Hello & welcome Sess,pls. read a bit more & use the search function CHDK wikiaCHDK in BriefFAQCHDK firmware usage (also as PDF file:Link)Allbest firmware usage
...For example, a section describes bracketing of Tv, Av, and ISO modes. But does the camera have to already have Tv and Av modes or will CHDK add them entirely?
...But what if a camera doesn't have bracketing to begin with? Will CHDK add bracketing entirely?
I'm considering buying the A650. The only build I've found that specifically mentions it is SDM. But the description of SDM only talks about the Stereo features. I've read that it includes everything in Fingalo 128 and a few things from AllBest, but it doesn't say what those features are. All I was about to learn about Fingalo is that it has to do with remote control.
...So the bottom line is, if I get a camera without built in bracketing like the A650, will CHDK be able to enable exposure bracketing? And if I get a camera without modes like Av, Tv, and M, will CHDK be able to add such modes?
Quote from: Sess on 11 / June / 2008, 15:28:43...For example, a section describes bracketing of Tv, Av, and ISO modes. But does the camera have to already have Tv and Av modes or will CHDK add them entirely?Yes, CHDK will add this features to the camera !
There are functions that allow you to set a shutter speed, or an aperture, but I'm not clear that those functions will give you good exposures in a "fully automated" mode, or that you'd be able to meter with the camera for full manual mode. I'm extremely dubious about your being able to set aperture or shutter speed and still get auto exposure on a camera that doesn't provide aperture and shutter priority.
The A650 is supported by CHDK; there are 2 main builds: SDM (Stereo Data Maker) and AllBest.Both builds adds nearly the same extensions to your camera; the SDM is designed especially for doing stereo photographing (but you can also use it with a single camera) and has some special extensions like USB remote control without the need of a script.For starting with CHDK you can always look for "AllBest", in this build most of the available extensions from older builds or other special versions are combined.So you can use Allbest #50 (the stable build) or the latest "AutoBuild" (beta version with some new or experimental features).
Quote...So the bottom line is, if I get a camera without built in bracketing like the A650, will CHDK be able to enable exposure bracketing? And if I get a camera without modes like Av, Tv, and M, will CHDK be able to add such modes?Yes, CHDK brings you bracketing; you'll get many additional features: What does the CHDK program do.See also "What camera should I buy ?
There is no physical ND filter in the A6xx series (A610, A620, A630, A640, A650). This is good because the IXUS and A7xx cameras only have NDs because they do not have a real iris to control the aperture - so it is a workaround. However, it is bad, because higher level cameras (the G series, from G3 through G9) have the ND filter AS WELL as real iris aperture. In this situation the ND filter is useful because it can be used in certain situations to reduce shutter speeds or open the aperture further while still preventing overexposure.
So CHDK is really able to give these features to a camera and have them work correctly? That's pretty impressive.
I skimmed through a few of their reviews (A640, SD850) and not once did they mention camera noise.
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