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12-08-2009, 09:14 AM   #1
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high iso in-camera processing duration k7 vs k20d

Hi all, first post,

With the K20D, if I take 10 second ISO 1600 shots in continuous shooting mode, the camera will churn for 10 seconds processing (presumably DFS) after closing the shutter and before opening the shutter for the next shot.

Various threads indicate that mandatory DFS only happens after 30 secs in bulb mode. Other threads say 15 secs in any mode. But my experience is that it happens for any exposure at ISO 800 and above and I've tweaked the high ISO noise settings all ways. Wonder what I've got wrong?

Last night I ran a K7 side by side with the K20D taking continuous 6 sec exposures and the K7 did not pause between shots. Is the K7 processing just fast or is it not doing DFS for exposures only 6 secs long? This is what I want the K20D to do too, what I thought could be done based on what I've read in other threads.

Thanks for any help! -Ed

12-08-2009, 01:59 PM   #2
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BTW, what you're describing is *slow shutter speed* NR, not *high ISO NR*. Two totally separate things. High ISO NR can be turned on or off at will on any of these cameras, and takes only a fraction of a second no matter how long the exposure was, because it doesn't use DFS. Slow shutter NR is the one that uses DFS and takes as long as the originl exposure, and can't be turned off on some models. No idea at exactly what point it kicks in on either model, though.
12-08-2009, 02:40 PM   #3
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QuoteOriginally posted by Marc Sabatella Quote
BTW, what you're describing is *slow shutter speed* NR, not *high ISO NR*. Two totally separate things. High ISO NR can be turned on or off at will on any of these cameras, and takes only a fraction of a second no matter how long the exposure was, because it doesn't use DFS. ...
Thanks for the reply. Makes sense. But regardless of the high ISO NR not being relevant, I made the connection to high ISO because the delay only happens when I have ISO set at 800 or above.

If I set ISO to 100 it will shoot one exposure after another without the 6 sec processing delay between 6 second exposures. If I then change the ISO to 1600 and make no other adjustments, the intervening 6 sec delay between shots kicks in. I posted because I had thought this delay was only for 30 sec or longer shots and was hoping there was something I was doing wrong.
12-08-2009, 06:03 PM   #4
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let me try to reply again. i posted a reply few hours ago and the forum software said it was sending it to "moderation".

Marc, thanks for the reply. makes sense. my question is still out there though, i only get the delay in between 6 second exposures when i set the iso to 800 or above.

is this the way it is or am i doing something wrong?

i made the connection to high iso because if i set the iso to 200 i can run the 6 second exposures one after another with no delay in between. if i then set the iso to 1600 and make no other changes there is then a 6 second processing delay in between each 6 second exposure. i had thought the mandatory dfs only kicked in after 30 sec or more bulb mode shots but i guess not.

thanks, -ed

12-09-2009, 12:03 PM   #5
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QuoteOriginally posted by navicore Quote
Thanks for the reply. Makes sense. But regardless of the high ISO NR not being relevant, I made the connection to high ISO because the delay only happens when I have ISO set at 800 or above.
Really? What about if you go up to 10 seconds? 20? 30? Perhaps the point at which the slow shutter speed ISO kicks in is ISO dependent? Or maybe it really does only kick in at ISO 800 and above, but I kind of doubt that is really true. Anyhow, point being, the settings of your high ISO NR options have no bearing that I know of on slow shutter NR.

QuoteQuote:
I posted because I had thought this delay was only for 30 sec or longer shots
No, definitely not. I always thought it kicked in at just a couple of seconds on my cameras, but I guess I've never really run the tests to know for sure, and I don't have either of the cameras you reference anyhow.
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