Win a Pentax Limited Lens: Raffle Now Live!

ss99 · 11-04-2014, 09:12 AM

hi, can some one advise about switch OFF the noise reduction while using low shutter speed?
since i couldn't find from the menu system.
Thanks!

Attached Images

View Picture EXIF

fap · 11-04-2014, 09:14 AM

Originally posted by ss99

hi, can some one advise about switch OFF the noise reduction while using low shutter speed?
since i couldn't find from the menu system.
Thanks!

Unlike the other Pentax cameras I am not aware that this can be turned off in 645Z......

Adam · 11-04-2014, 01:02 PM

Originally posted by ss99

hi, can some one advise about switch OFF the noise reduction while using low shutter speed?
since i couldn't find from the menu system.
Thanks!

Fap is correct, slow shutter speed noise reduction cannot be turned off on the 645Z.

rawr · 11-04-2014, 06:02 PM

Does Slow Shutter Speed NR apply when you shoot RAW, or is it just a JPEG thing?

**Ed Hurst** · 11-04-2014, 06:19 PM

It applies to RAW as well. At least in the 645Z, it can be set to 'On' or 'Auto', which means that it does not take place in all circumstances. On the 645D, it had 'On' and 'Off' settings, but 'Off' did not turn it off in most situations, which was very frustrating.

Auto seems to depend on algorithms based on three variables: exposure duration, ISO and temperature. I have found that in most situations in which I would want to avoid the dark frame being shot, there is a combination of ISO and exposure length that avoids the dark frame (which certainly was not the case with the 645D). For example, with star trails, I can certainly shoot consecutive frames without a gap. Beyond those limits, the dark frame is probably necessary for quality in any case. Beware the temperature variable! I have found certain exposure parameters to avoid dark frames on one day and not on another (when it was warmer). So it needs experimentation on any given occasion.

It would be nice if it could be turned off - and I would like that very much. But that's not the case. I would urge a little trial and error to see what combination of exposure length and ISO you can get away with in a given situation.

Good luck!

Ed

rawr · 11-04-2014, 07:12 PM

In this forum there are discussions of the hidden debug modes that are available for various Pentaxes. One of the debug options for some bodies was to turn off dark frame subtraction on cameras that didn't let you disable DFS in the main menu.

I bet that lurking within the 645Z is a debug menu option to allow DFS to be turned completely off.

11-04-2014, 01:02 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Originally posted by ss99 hi, can some one advise about switch OFF the noise reduction while using low shutter speed? since i couldn't find from the menu system. Thanks! Fap is correct, slow shutter speed noise reduction cannot be turned off on the 645Z. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
slow shutter speed noise reduction	simons-photography	Pentax DSLR Discussion	15	05-20-2017 10:20 PM
For Sale - Sold: K-5iis Low Shutter Actuations and Free EE-S Screen Price Reduction	cali92rs	Sold Items	8	05-18-2014 08:30 PM
slow shutter speed noise reduction	mde1970	Troubleshooting and Beginner Help	4	12-31-2012 01:28 AM
K-r High ISO Noise Reduction problem	ions	Pentax K-r	3	11-12-2010 01:11 AM
K20d - doubts about live view and long shutter noise reduction...	José Ramos	Pentax DSLR Discussion	16	01-26-2010 05:25 PM

11-04-2014, 09:14 AM	#2
fap New Member Join Date: Nov 2010 Posts: 7	Originally posted by ss99 hi, can some one advise about switch OFF the noise reduction while using low shutter speed? since i couldn't find from the menu system. Thanks! Unlike the other Pentax cameras I am not aware that this can be turned off in 645Z......

11-04-2014, 06:02 PM	#4
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Does Slow Shutter Speed NR apply when you shoot RAW, or is it just a JPEG thing?

11-04-2014, 06:19 PM	#5
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,657	It applies to RAW as well. At least in the 645Z, it can be set to 'On' or 'Auto', which means that it does not take place in all circumstances. On the 645D, it had 'On' and 'Off' settings, but 'Off' did not turn it off in most situations, which was very frustrating. Auto seems to depend on algorithms based on three variables: exposure duration, ISO and temperature. I have found that in most situations in which I would want to avoid the dark frame being shot, there is a combination of ISO and exposure length that avoids the dark frame (which certainly was not the case with the 645D). For example, with star trails, I can certainly shoot consecutive frames without a gap. Beyond those limits, the dark frame is probably necessary for quality in any case. Beware the temperature variable! I have found certain exposure parameters to avoid dark frames on one day and not on another (when it was warmer). So it needs experimentation on any given occasion. It would be nice if it could be turned off - and I would like that very much. But that's not the case. I would urge a little trial and error to see what combination of exposure length and ISO you can get away with in a given situation. Good luck! Ed

11-04-2014, 07:12 PM	#6
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	In this forum there are discussions of the hidden debug modes that are available for various Pentaxes. One of the debug options for some bodies was to turn off dark frame subtraction on cameras that didn't let you disable DFS in the main menu. I bet that lurking within the 645Z is a debug menu option to allow DFS to be turned completely off.

645z low shutter noise reduction problem

Win a Pentax Limited Lens: Raffle Now Live!