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02-09-2015, 03:01 PM   #1
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K3...dfs?

my first pentax DSLR was the K20 (which i still use and love just as much now as i did when i first purchased it) but it frustrated the hell out of me that you could not turn off DFS (dark frame subtraction) so i picked up a used K10 a few months after buying the K20 just to use it for night shots only. yesterday i ordered the gunmetal prestige edition of the K3 and i am wondering...does the K3 behave like the K20 does in respect to DFS? or can you turn it off like you can with the K10???
thanks!

02-09-2015, 03:09 PM   #2
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It is called slow shutter speed NR.
02-09-2015, 03:09 PM   #3
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And yes, it can be disabled.

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02-09-2015, 06:33 PM   #4
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What is the downside?

02-09-2015, 08:02 PM   #5
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QuoteOriginally posted by UncleVanya Quote
What is the downside?
The downside of having it turned on? Long exposures take twice as long (a 30 second exposure will trigger a 30 second shutter-closed exposure to extract hot pixel marks or whatever the dark frame subtraction does).

The downside of having it turned off? Long exposures could be noisier; particularly this is a problem if you're taking astronomy photos... extra stars show up that only exist in your camera's imagination.
02-09-2015, 08:51 PM   #6
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No astrophotographer I know uses DFS. It is all taken care of in post.
02-09-2015, 11:24 PM   #7
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thats exactly where i take care of the noise - but im wanting to shoot more time lapses of the night sky and the gap between each shot with DFS makes everything a little janky :/ so hearing that it can be disabled on the K3 made my day!!
02-10-2015, 01:09 PM   #8
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Agree that being able to disable DFS is mandatory. If you are doing deep sky astro shots with 10 minute frames, there is no way you are going to waste another 10 miutes with DFS when you know your clear sky window is limited by that next front rolling in.

02-10-2015, 02:04 PM   #9
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i have never understood why you can disable it on the K10 and not the K20...i assume every rig after the K20 you were able to turn it off...?
02-10-2015, 02:09 PM - 1 Like   #10
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I was able to turn it off on my k-x if I remember correctly. It seems the k-3 can have it turned off as well. I remember someone said that the 645Z had it as mandatory on, but then they fixed it in a firmware update. So Pentax seems to take care of us on that front.
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