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Michael Piziak · 10-19-2021, 09:42 PM

How to turn off long exposure noise reduction on the k-s2 ?

So that it doesn't take forever to process a photo at the end of a long exposure doing astrophotography....

syyrmb · 10-19-2021, 10:08 PM

This option should be in Menu - Image setting page 2 - Noise Reduction - Slow Shutter Speed NR, turn it off to disable LENR.

AfterPentax Mark II · 10-20-2021, 01:37 AM - **1 Like**

Usually these answers can be found in the manual that comes with the camera.

biz-engineer · 10-20-2021, 03:38 AM - **1 Like**

Originally posted by Michael Piziak

How to turn off long exposure noise reduction on the k-s2 ?

Avoid using long exposures.

---------- Post added 20-10-21 at 12:39 ----------

Originally posted by AfterPentax Mark II

How about consulting the manual?

As we say: RTFM

**ProfessorBuzz** · 10-20-2021, 09:46 AM - **1 Like**

Originally posted by Michael Piziak

How to turn off long exposure noise reduction on the k-s2 ?

With all due respect and great affection, read the manual.

Originally posted by Michael Piziak

So that it doesn't take forever to process a photo at the end of a long exposure doing astrophotography....

Ther'es two workflows astrophotographers follow:

1) If you have plenty of shooting time, you actually probably WANT this turned on. The camera shoots your light image of the night sky, and then shoots a second image with the shutter closed, and subtracts them, removing hot/warm pixels and lowering overall noise.

2) Shoot a dark frame under the same conditions. e.g. camera completely covered, at the same temperature and exposure length and ISO.
Then you'd subtract the dark frame in post processing later.
That will give you more shooting time under clear skies.
The downside is the camera will get hotter the longer it is on and doing things. So heat builds up, and dark current raises the noise on the sensor.
Shooting the dark at the same time ensures consistent level of dark current in both frames, so it will substract out of the light frame.
If you have a CCD sensor in your camera, this is quite consistent.
The CMOS sensors in newer cameras behave a bit differently, but the principle is the same.
So, the experts will shoot darks at intervals through the night, and build a library of them, or a "master" dark produced by averaging a number of darks.

10-19-2021, 09:42 PM	#1
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815	How to turn off long exposure noise reduction on the k-s2 ? How to turn off long exposure noise reduction on the k-s2 ? So that it doesn't take forever to process a photo at the end of a long exposure doing astrophotography....

10-20-2021, 01:37 AM - 1 Like	#3
AfterPentax Mark II Pentaxian Join Date: Mar 2021 Posts: 1,467	How about consulting the manual? Usually these answers can be found in the manual that comes with the camera.

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10-19-2021, 10:08 PM	#2
syyrmb Forum Member Join Date: Sep 2020 Location: Qingdao Posts: 94	This option should be in Menu - Image setting page 2 - Noise Reduction - Slow Shutter Speed NR, turn it off to disable LENR.

10-20-2021, 03:38 AM - 1 Like	#4
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,249	Originally posted by Michael Piziak How to turn off long exposure noise reduction on the k-s2 ? Avoid using long exposures. ---------- Post added 20-10-21 at 12:39 ---------- Originally posted by AfterPentax Mark II How about consulting the manual? As we say: RTFM

10-20-2021, 09:46 AM - 1 Like	#5
ProfessorBuzz Loyal Site Supporter Join Date: Feb 2018 Posts: 1,903	Originally posted by Michael Piziak How to turn off long exposure noise reduction on the k-s2 ? With all due respect and great affection, read the manual. Originally posted by Michael Piziak So that it doesn't take forever to process a photo at the end of a long exposure doing astrophotography.... Ther'es two workflows astrophotographers follow: 1) If you have plenty of shooting time, you actually probably WANT this turned on. The camera shoots your light image of the night sky, and then shoots a second image with the shutter closed, and subtracts them, removing hot/warm pixels and lowering overall noise. 2) Shoot a dark frame under the same conditions. e.g. camera completely covered, at the same temperature and exposure length and ISO. Then you'd subtract the dark frame in post processing later. That will give you more shooting time under clear skies. The downside is the camera will get hotter the longer it is on and doing things. So heat builds up, and dark current raises the noise on the sensor. Shooting the dark at the same time ensures consistent level of dark current in both frames, so it will substract out of the light frame. If you have a CCD sensor in your camera, this is quite consistent. The CMOS sensors in newer cameras behave a bit differently, but the principle is the same. So, the experts will shoot darks at intervals through the night, and build a library of them, or a "master" dark produced by averaging a number of darks.