Author Topic: Long exposure noise reduction  (Read 7839 times)

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Offline dominicall

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Long exposure noise reduction
« on: October 22, 2008, 01:48:33 PM »
Afternoon all

Am planning to take some more shots for this month's competition this evening. Does anyone know whether on the 700 the Long Exposure noise reduction has any effect on RAW files or not?

Thanks for your help.

Dominic
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Offline tpe

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Re: Long exposure noise reduction
« Reply #1 on: October 22, 2008, 02:29:20 PM »
I am sorry i cant answer your question as not a raw user, but you can turn the long exposure noise reduction on and off under option 3 in the camera meneue (so i am guessing it does).

What i was wondering (for exactly the same reson, but it is a little cold here atm) is if it is possible to take a black frame specifically to use for noise reduction in PP? And if so is it just a case of taking a picture of the same exposure with the lens cap on?

tim

Offline dominicall

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Re: Long exposure noise reduction
« Reply #2 on: October 22, 2008, 02:47:04 PM »
Tim - funny, I was thinking a similar thing on the train on the way home a couple of weeks ago.

I've been using Neat Image for NR in Photoshop (runs standalone too) so I did some digging around profiles in the software. There are camera specific downloadable profiles for NI here http://www.neatimage.com/noise-profiles/digital-cameras/Sony/download.html that seem to work pretty well.

Not sure how they will work with Long Exposures though. When I'm out tonight I'll shoot some with and some without and if there's anything worth noting will post the results for others to have a look at.

Dominic
a900+VG + A700
CZ24-70, Sony 70-200G, Sony 70-300G, Sony 135 STF, CZ85mm, KM 20mm, KM 24mm RS, KM 17-35G, KM 400/4.5G HS, Tamron 90mm Macro, Sony 50 1.4, Sony 16mm Fisheye
Sony HVLF58AM, HVLF42AM
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Offline winjeel

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Re: Long exposure noise reduction
« Reply #3 on: October 22, 2008, 03:45:07 PM »
I've used long exposure for fireworks on the noisy old 5d, and I shoot RAW. So the procedure is... not to worry. Use iso100, and use the blur tool in photoshop for any noisy bits (not really likely) that you find.
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Offline Rob aka [minolta mad]

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Re: Long exposure noise reduction
« Reply #4 on: October 22, 2008, 05:45:54 PM »
My own opinion is that the NR makes no difference, but have not tried it since installing V4 firmware.
Prefer to do the NR in Photoshop.


Rob [minolta mad]

Offline Stef.

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Re: Long exposure noise reduction
« Reply #5 on: October 22, 2008, 07:06:46 PM »
NR in RAW does nothing BUT it does on the image displayed on the back of the camera as this little image is always a raw version. A year ago we had this discussion if some of you might remember re. DRO setting and RAW and the problem if the image displaying the DRO version on the back of the camera while the "real" raw image is much darker... so to be on the safe side: set NR to off if you want to check the noise on the image on the back of the camera as this comes closest to the real one.
Re.: black frame- yes this should work.
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Offline dominicall

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Re: Long exposure noise reduction
« Reply #6 on: October 28, 2008, 02:52:26 PM »
Just to follow up - I didn't really get the chance to properly do the Long Exposure NR On/Off test for two reasons:

1. I was getting bored after a good few 3 minute exposures ;-)
2. It was bl**dy cold.

I'll do a proper test and post the results soon - possibly over the weekend.

Dominic
a900+VG + A700
CZ24-70, Sony 70-200G, Sony 70-300G, Sony 135 STF, CZ85mm, KM 20mm, KM 24mm RS, KM 17-35G, KM 400/4.5G HS, Tamron 90mm Macro, Sony 50 1.4, Sony 16mm Fisheye
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Offline carlosdivega

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Re: Long exposure noise reduction
« Reply #7 on: October 30, 2008, 08:03:35 AM »
Hi all,
i'm a RAW shooter. I have lot of experience with the 5D, 7D and A700.

Long exposure noise reduction on those DSLR's (so i guess on all Sony DSLR's) just shoots a black frame for the same exposure time as the RAW exposure. Then the camera substracts any noise found in the black frame from the RAW.

This feature helps eliminating noise generated by temperature changes of the sensor due to long exposure.
E.g. taking long exposures in a cold winter night of the sky. This feature is typical used by astrophotographers.

If you are shooting long exposures under conditions with minimal thermal differences between the ambient temperature and temperature within the camera, you can turn off the long exposure noise reduction. E.g. Indoor shooting.

Wish you all good light

;) Carlos Di Vega
« Last Edit: October 30, 2008, 08:06:03 AM by carlosdivega »

Offline dominicall

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Re: Long exposure noise reduction
« Reply #8 on: November 04, 2008, 06:30:25 AM »
Hi Carlos

Thanks for the explanation. Appreciate the input. :-)

Dominic
a900+VG + A700
CZ24-70, Sony 70-200G, Sony 70-300G, Sony 135 STF, CZ85mm, KM 20mm, KM 24mm RS, KM 17-35G, KM 400/4.5G HS, Tamron 90mm Macro, Sony 50 1.4, Sony 16mm Fisheye
Sony HVLF58AM, HVLF42AM
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Take nothing but pictures, leave nothing but footprints.

Offline JackWaddell

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Re: Long exposure noise reduction
« Reply #9 on: March 31, 2016, 01:08:38 PM »
I often use noise reduction plugin from macphun.com/noiseless to reduce noise, as for me this is the best solution, besides you don't need to change ISO settings. Try to and I'm sure it will be useful for you. Good luck.

Offline CHOLLY

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Re: Long exposure noise reduction
« Reply #10 on: April 02, 2016, 02:26:37 AM »
Jack...  the last post in this thread was made nearly 7.5 years ago.
There are people who actually think LENS stabilization is better than sensor shifting!

Offline chappo1

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Re: Long exposure noise reduction
« Reply #11 on: April 02, 2016, 03:44:57 AM »
Welcome Jack and good to see folks using the archives here for information. I took a look at your suggestion but I already have noiseware and the Nik collection is now free.
Thanks for your suggestion though and please stick around and contribute....john
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