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TOPIC: noise reduction over long exposure

noise reduction over long exposure 4 years 10 months ago #635

Hi all, I'm having some trouble with noise reduction on long exposure pics,I've tried to fix it with LR4 but the image is not good as I wanted can anyone help me?

kkphotos.blogspot.com
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Re: noise reduction over long exposure 4 years 10 months ago #638

  • Serdar Dikdik
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noise in long exposure?

turn off your auto iso setting. put your iso as low as possible 100 or 200, and keep your shutter longer.

I think you have high iso selected, thats why you are having noise.
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Re: noise reduction over long exposure 4 years 10 months ago #644

  • Christian Udarbe
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Agreed with Serdar. Possibly you've got your ISO quite high here. Usually, you'd want to use the lowest ISO your camera has during long exposures.

And if that doesn't cut it, if you're a Nikon user, there should be an option in the menu named Long Exposure Noise Reduction (or Long Exp NR). I don't know the Canon equivalent to that option :oops:

But more often than not, just having you're ISO set lower should remedy that.

Have another go at this and let us know!

Happy Shooting!

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Re: noise reduction over long exposure 4 years 10 months ago #651

Iso was not auto and camera was in manual mode on a tripod with bulb exposure for 120 seconds
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Re: noise reduction over long exposure 4 years 10 months ago #653

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What was ISO setting though? Even if it isn't on auto-ISO, what was its value?

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Re: noise reduction over long exposure 4 years 10 months ago #654

  • Serdar Dikdik
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ok iso was not in auto, so what was it
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Re: noise reduction over long exposure 4 years 10 months ago #655

  • Serdar Dikdik
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hahaha sory christian I havent seen your post.

heart to heart same question, u r my man.
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Re: noise reduction over long exposure 4 years 10 months ago #657

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LOL no problem friend! Our minds are in the same wavelength!! :)

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Re: noise reduction over long exposure 4 years 10 months ago #664

  • Olaf Kleemeyer
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Using low ISO is just half the truth. During long exposures, the sensor is warming up, noise is increasing then. So it might be better in certain situations, to increase the ISO a little bit to decrease the exposure-time. Noise-reduction causes a lack of details and sharpnes, as it can be seen on the photo, you´ve posted.
Conclusion: Trial and error, the results are depending on the amount of ambient light. There is no nostrum, sorry :(

BTW: Here´s a photo with ISO 1000 to keep a fast shutterspeed

Tempodrom von Olaf Kleemeyer auf Flickr
Nikon D700, Nikkor 24mm 1.4, 50mm 1.4, 70-200mm 2.8
Last Edit: 4 years 10 months ago by Olaf Kleemeyer.
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Re: noise reduction over long exposure 4 years 10 months ago #669

  • Serdar Dikdik
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Dear Olaf,

120seconds as our friend has done, is not a long time to show that much of noise because of the sensor warming as far as I knew.

There is a link of the guys I am admiring and following on my long exposure tries as knowledge. Those guys are using much longer exposures and there is no noise on theirs. Also Scott kelby a nice long exposure guy taking longer shutters without noise.

You know what came in my mind Right Now. Dude you have to close the viewfinder, to stop light coming from the mirror.
d3s has a lock to close the viewfinder. Notsure if the d700 has. If it does close it, if not put a scotch tape on it.

please try and let us the result. Also keep the ISO low
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Re: noise reduction over long exposure 4 years 10 months ago #670

  • Serdar Dikdik
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the link


also, olaf while we are filming movie on the dslr, how the sensor is not warming up. I dont know if you know can you share
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Re: noise reduction over long exposure 4 years 10 months ago #697

  • Christian Udarbe
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It's true that increasing the ISO will decrease the exposure time, but I think Kevin wants to have the longer shutter speed by looking at his photo (the slight star streaks); so raising the ISO to lower the shutter speed a tad too much might defeat the purpose.

And yes, noise-reduction will lose a ton of details, but that should only be during the post-processing. I think he wants to get it right in the camera, so he doesn't have to worry about the noise while post-processing.

I still say, try lowering the ISO; if you're a Nikon user, look for the Long Exp NR option in your menu.

Let us know if it remedies the noise.

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