shuttle speed "override" is not TV mode?

zly2002

2

« on: 18 / July / 2008, 00:01:41 »

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During the provious tests I made with my TX1 (allbest-tx1-101b-51-441):

I shoot under sunshine without CHDK, M mode (also I have tried that in auto mode, but the same ), flash off.
the tx1 auto adjust to F5.0 , 250/1. The pictures were exposed properly.

Then I turn on CHDK and manually set shuttle speed override to 1/500 (or more higher speed). The TX1 still gave me the F5.0. The images then became underexposed badly. It suppose to turn to F3.5 at least. But It still kept the same aperture like no CHKD installed. That's why I thought the TX1 do not have the function of TV mode with CHDK. (My understanding to the TV mode is: Shuttle speed priority and auto adjust aperture to get proprely exposure)

remark: TX1 do not has the TV & AV mode itself.

when set shuttle speed override, "I found the TX1 is not in TV mode but tuned to a full manual camera, which means you have to manually set the aperture to get proper exposure. Otherwise the aperture will only stay at the value without CHDK. " Maybe that's the reason called "shuttle speed override" (not TV mode)

One thing else, I heard that the noise reduce function in raw setting also works for the JPEG images even the raw is set off. I've not tried that yet. Is it true?

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PhyrePhoX

2254
make RAW not WAR

Re: shuttle speed "override" is not TV mode?

« Reply #1 on: 18 / July / 2008, 02:39:22 »

shuttle speed override would be a warp drive, wouldnt it? i think you mean shutter speed override.
what i dont get is how in M (manual!) mode your camera AUTO-adjusts to F5 and 250/1. M mode normally means that you have to set aperture and shutterspeed yourself. when you use the shutterspeed override, the camera itself does not know that you use it, thus it can not automatically adjust aperture, you'd have to do this yourself or via a script.

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dzsemx

302
[SX40HS][A650][A630]

Re: shuttle speed "override" is not TV mode?

« Reply #2 on: 18 / July / 2008, 05:21:49 »

TX1 has no real manual mode, only just a few low-end style "manual mode" settings, which is called P mode on Axxx series

noise reduction works without raw, that's true, turning off it can speed up low light burstshots (if you don't have hot pixels),
forcing always on can eliminate totally dead pixels at any shutter speeds, without badpixel mapping, but it'll shoot slower

« Last Edit: 18 / July / 2008, 05:28:46 by dzsemx »

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zly2002

2

Re: shuttle speed "override" is not TV mode?

« Reply #3 on: 18 / July / 2008, 12:26:09 »

M mode on tx1 is just like auto mode on the other cameras. There is no true manual mode for shuttle speed and aperture adjustment, as weel as no TV or AV mode.

The purpose I use CHDK is just would hope to add some TV mode or S mode for capture fast moving images. But accurally, it tuned to a full manual camera.

Quote from: PhyrePhoX on 18 / July / 2008, 02:39:22

shuttle speed override would be a warp drive, wouldnt it? i think you mean shutter speed override.
what i dont get is how in M (manual!) mode your camera AUTO-adjusts to F5 and 250/1. M mode normally means that you have to set aperture and shutterspeed yourself. when you use the shutterspeed override, the camera itself does not know that you use it, thus it can not automatically adjust aperture, you'd have to do this yourself or via a script.

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