Apply more than 3 stop exposure reduction to ND Filter

Mirfak

Apply more than 3 stop exposure reduction to ND Filter

« on: 30 / August / 2008, 13:07:57 »

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I'm aware that the ability to take a dark frame without NR has been a top request for some time. I was wondering if it might be possible to simulate a dark frame using the ND filter. If that were possible though, there would have to be a way to have a "blacker" ND filter i.e. providing more than three stops of exposure reduction when turned on.

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fudgey

1705
a570is

Re: Apply more than 3 stop exposure reduction to ND Filter

« Reply #1 on: 30 / August / 2008, 13:41:25 »

Actually I think we already know how to take dark frames by closing the shutter: http://chdk.setepontos.com/index.php/topic,1365.msg16080.html#msg16080. Just needs to be ported to all cameras and tested, I suppose.

To make an ND filter stop more light than it does now requires dismantling the camera, changing the ND filter and rebuilding the camera (ok, this step will fail miserably). And after that you won't be able to shoot in bright daylight.

Not to mention that lots/most CHDK cameras don't have ND filters.

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Mirfak

Re: Apply more than 3 stop exposure reduction to ND Filter

« Reply #2 on: 30 / August / 2008, 14:44:42 »

Oh, I was thinking that the ND filter was done electronically.

However, if we already know how to get the dark frame by closing the shutter, great! I'll wait patiently for the feature to turn up in the trunk or one of the main branches.

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fe50

3134
IXUS50 & 860, SX10 Star WARs-Star RAWs

Re: Apply more than 3 stop exposure reduction to ND Filter

« Reply #3 on: 31 / August / 2008, 06:40:04 »

Quote from: Mirfak on 30 / August / 2008, 14:44:42

Oh, I was thinking that the ND filter was done electronically.

The ND filter on all (?) of the P&S Canons is mechanical, so it's not adjustable, it only swings in / out (mechanicaly), you can hear it "swinging"...

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