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01-14-2010, 04:42 AM   #1
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K20D really slow

hey there,
i'm using a K20D and last weeks i'm often shoot long time exposures. the thing that really annoys me, is that the camera takes very very long to convert the pictures. means if i take a 30sec pic, it converts at least 10sec(and about the time of a bulb-picture i don't even wanna talk about.....), until it shows the pic on the monitor and i can go on. a friend using a k-7 has however just 1 sec to see the picture.
is the k20D that slow??

greetings,
beni

01-14-2010, 04:51 AM   #2
Ash
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Hi Beni and welcome.
Be weary that there is a mandatory DFS (dark-frame subtraction) process that occurs after every long exposure. This is the K20D's method of keeping noise down in long exposures. The K-7 has the option of turning this off. Not so with the K20D. I'm afraid you'll have to put up with it.
01-14-2010, 04:52 AM   #3
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It's the dark frame noise reduction function working. You can shut it off entirely on the K10, and I believe you can shut it off for shorter exposure times (less then 30 sec) on the K20 (might be wrong though as I don't own a k20 myself).

Edit, apparently you can't shut it off.
01-14-2010, 05:21 AM   #4
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No, I think you can shut it off for exposures less than 30 seconds on the K20 after a firmware up date.

01-14-2010, 06:56 AM   #5
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Ok, thank you. So I have one more reason to buy a K-7 eventually
01-14-2010, 07:10 AM   #6
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QuoteOriginally posted by Ash Quote
Hi Beni and welcome.
Be weary that there is a mandatory DFS (dark-frame subtraction) process that occurs after every long exposure. This is the K20D's method of keeping noise down in long exposures. The K-7 has the option of turning this off. Not so with the K20D. I'm afraid you'll have to put up with it.
I thought with the K-7 you could not turn it off either. ????
William
01-14-2010, 09:46 AM   #7
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QuoteOriginally posted by WillCarney Quote
I thought with the K-7 you could not turn it off either. ????
William
You can't turn it off, but it takes the dark frame picture at about one third of the exposure time.
01-14-2010, 10:10 AM   #8
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Sorry then I stand corrected.
Mandatory DFS occurs with both the K20D and K-7, only on the K20D it equals the exposure time.

01-14-2010, 10:49 AM   #9
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QuoteOriginally posted by Rondec Quote
No, I think you can shut it off for exposures less than 30 seconds on the K20 after a firmware up date.
Are you sure? I own a K20D and would REALLY be interested in that firmware update. I hadn't heard of it though...

You'd have to search for the thread but someone thought of a nice work-around for the K7 DFS issue. It can be turned off for exposures 30 sec. or less (not for Bulb mode), so the person used the multiple exposure feature to stack a bunch of 30-sec. exposures into one long exposure, thus bypassing the need for DFS. If the K7 is like my K20D then you can stack up to 9 such exposures into one.

I can't attempt anything even close to this, there is just no option of shutting of DFS on the K20D, whether for 3 seconds or 30- the option is to have it on all the time, or "let the camera decide based on conditions", which is basically no difference, I don't even know why they included such an option in the custom menu.
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