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DPChallenge Forums >> Photography Discussion >> Night ISO
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 05/06/2006 02:40:44 AM · #1
For shooting a long exposure shot (where speed isn't an issue) is it better to use ISO 100 on the Canon 20D, or 200-400?

I'm trying to get the highest quality image with the least amount of noise. Also is the noise reduction feature worth turning on?

Message edited by author 2006-05-06 02:45:27.
 05/06/2006 02:43:11 AM · #2
I shoot my night shots at ISO 100 and use noise reduction, and I find them stunningly smooth and excellent, as far as noise goes. But the noise reduction takes a LONG time to process and clear. I haven't done any tests at the other ISO speeds, though.

R.
 05/06/2006 02:45:49 AM · #3
Does the noise reduction reduce sharpness?
05/06/2006 02:45:56 AM · #4
I also use ISO 100 with long exposure noise reduction
 05/06/2006 02:46:14 AM · #5
I forgot about the noise reduction in my night shot..

:(
 05/06/2006 02:46:30 AM · #6
Originally posted by reemas:
Does the noise reduction reduce sharpness?


not from my experience but you almost always have to do a slight USM to tidy things up ;)
 05/06/2006 02:47:11 AM · #7
Originally posted by biteme:
I forgot about the noise reduction in my night shot..

:(


hehehhe. just turn it on hanneke. it's in your custom functions ;)
 05/06/2006 02:48:18 AM · #8
I know!!!

I saw it after I took the shot, at home :(
 05/06/2006 02:48:46 AM · #9
mine is always on... it doesn't hurt ;)
 05/06/2006 02:49:03 AM · #10
Originally posted by reemas:
Does the noise reduction reduce sharpness?


No, not that I have seen. I just processed a night shot that is stunningly crisp, with no trace of noise whatsoever and rich, vibrant color to boot :-)

R.
 05/06/2006 02:50:09 AM · #11
Originally posted by Bear_Music:
Originally posted by reemas:
Does the noise reduction reduce sharpness?


No, not that I have seen. I just processed a night shot that is stunningly crisp, with no trace of noise whatsoever and rich, vibrant color to boot :-)

R.


"nautical twilight" papa bear? :P
 05/06/2006 02:50:16 AM · #12
I'm not good at Neat Imange or something like that.

would that help? I used "reduce noise" in Photoshop

Message edited by author 2006-05-06 02:50:30.
 05/06/2006 02:51:49 AM · #13
Originally posted by biteme:
I'm not good at Neat Imange or something like that.

would that help? I used "reduce noise" in Photoshop


i use the presets (bibble) for the 20D and just use the default setting but almost always, i take it down to about 40% instead of the 60% default :)
 05/06/2006 02:53:32 AM · #14
ow.

ok.

I don't have bibble. I think I'm gonna unsubmit :(
 05/06/2006 03:19:12 AM · #15
Dang is this Team Canon?! I didn't see anything but a 20D or 30D. Yes depending on the subject push the iso down if it stationary, run the noise reducer blank click sensor noise. Im really starting to like 50 ISO on night shots;) But Im just a lone olympus man having fun.
 05/06/2006 06:23:57 AM · #16
Just remember that the noise reduction feature takes about as long to process as the capture lasted. Which means if you exposed your image for 5 minztes, you have to wait another 5 minutes before you can take the next picture. I usually turn it on only when I'm done testing and got everything set the way I want for the final shot.
 05/06/2006 11:11:57 AM · #17
Some more good info for you reguarding Noise reduction in your camera

KNOW ABOUT IT BEFORE YOU SHOOT and if in a rush, know why or why not to
use it (I posted it in another night photography thread)

Noise reduction will NOT make an image soft. Lets say that you take a picture for 5 seconds. The camera will close the shutter when the picture is taken and record the same amount of time (5 sec in this case) with NO LIGHT at all and use the image to see any Hot or dead pixels. It will then FIX the dead or hot pixels in the image making a MUCH cleaner image. The only downside is that the shot we just took of 5 seconds took 5 more seconds to process. Not bad but when you leave the shutter open for 20 minutes and then have to wait 20 minutes before you can do anything with your camera....well, the image quality is still worth it...BUT FRUSTRATING!

It has absolutely no effect on sharpness. Hope this helps.


05/06/2006 01:30:23 PM · #18
Interesting discussion. I went out last night for the first attempts at night shots I have ever made. Hand held at 3200 ISO kept the noise reduction in CAM off (all exposures under 1 sec.) and they didn't look bad at all. However, the types of shots I was taking wouldn't show much noise anyway.

I commend all who can get those fantastic night scenes. I got a lot to learn in this area.
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