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11-16-2010, 12:11 PM   #1
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K-5 Noise Reduction

It's probably been said here before but...

Reading through the documentation, it appears you can turn off the noise reduction on the K-5 the same way you could on the K10D for long exposures. I have a K10 and K20 and would only need the K20D if it wasn't for it's inability to shut off the noise reduction.

I'm assuming this has been fixed with the K-5 and it can once again be shut off?

Thanks for any help!

11-16-2010, 12:14 PM   #2
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Yes, you can shut it off and I believe it's already tested for over one hour long exposures.
11-16-2010, 01:17 PM   #3
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Thanks! Good to know!
11-16-2010, 01:49 PM   #4
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since i moved fm a k20 and couldnt do this, why is it a good practice to do that for long exposures?

11-16-2010, 02:03 PM   #5
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QuoteOriginally posted by patriotap Quote
since i moved fm a k20 and couldnt do this, why is it a good practice to do that for long exposures?
Among other things you can use much more powerful noise reduction s/w in a PC than that which can be crammed in some firmware on a camera.
11-16-2010, 02:19 PM   #6
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My main reason...with NR turned on, if you take a long exposure, say 5 minutes, as soon as your exposure is done, the camera will automatically take another 5 minute exposure with the shutter closed to use as a comparison when reducing the noise. This wreaks havoc when you are trying to take several images in sequence such as star trails.

By allowing you to turn off the NR, you can then take your sequence and then do one manual black image at the end and combine them in post to reduce the noise.

It was one of the few negatives I had about the K20D. Before purchasing a K-5, I just wanted to make sure this had been rectified. Sounds like it has! Excellent!
03-02-2011, 03:47 PM   #7
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not necessairely, navcom. the dedicated hard (processor) and software actually might do a better job than is cramped in a general purpose computer. The K-5 does an excellent job and NR. Having said that, NR can be customized by ISO level or on long (>1') exposures or switched off completely.
03-02-2011, 08:23 PM   #8
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I use k20,also have this problem,nice to notice this

03-03-2011, 02:27 AM   #9
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There is confusion in this thread between NR and DFS

Noise reduction is the reducing of noise within the image caused by hi gain in the sensors op amps.

DFS (dark frame subtraction) is the removal of dead pixels caused by long exposures.

The OP is asking about switching of DFS because if you take 3 30min exposures with DFS on it will take 3 hours the results will be 100% perfect.

If you switch it off and take on dark frame for precessing against the 3 images it will take 2 hours and be 100% perfect.

Its a no brainer and I don't know what Pentax devs were thinking in the k20d

It takes next to zero processing power and is as affective in camera or out.
03-03-2011, 03:05 AM   #10
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I didn't know you could turn off DFS on a K10D. Any hints?
03-03-2011, 05:36 AM   #11
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QuoteOriginally posted by Tringle WP Quote
I didn't know you could turn off DFS on a K10D. Any hints?
It is in one of the menus. Says something about long exposure noise reduction on or off. If you turn it off, then the camera will not do DFS automatically. On the K20 and K7 is not an option to turn it off for exposures longer than 30 seconds.
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