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Subject: "Night Photography- Small red stars with no trails" Previous topic | Next topic
Pipewelder Registered since 09th Jan 2013Fri 24-May-13 11:11 AM
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"Night Photography- Small red stars with no trails"


Iuka, US
          

I have recently began taking more pictures at night. I have noticed at 100% view I see small red and purple specks that I do not believe are stars. They do not trail like the stars. These are 1 minute or less exposures.

Is this "noise" or something else. I do a poor job staying out of dusty areas and wonder if there is something inside the camera.

Here is one of the images.

Thanks for any information.

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Replies to this topic
Subject Author Message Date ID
Reply message RE: Night Photography- Small red stars with no trails
kodiak photo Silver Member
24th May 2013
1
Reply message RE: Night Photography- Small red stars with no trails
Pipewelder
24th May 2013
2
     Reply message RE: Night Photography- Small red stars with no trails
nrothschild Silver Member
24th May 2013
4
     Reply message RE: Night Photography- Small red stars with no trails
kodiak photo Silver Member
24th May 2013
5
Reply message RE: Night Photography- Small red stars with no trails
aolander Silver Member
24th May 2013
3
Reply message RE: Night Photography- Small red stars with no trails
Pipewelder
25th May 2013
6

kodiak photo Silver Member Nikonian since 28th Feb 2013Fri 24-May-13 11:47 AM
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#1. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 0


Montrιal, (Qc), CA
          

*
Hi Gerald,

Your assumption, that there may be noise in your shot,
is absolutely correct. But there is more!

In night photography, the two problems, most often met,
are noise and compression artefacts. The noise is taken
care of with the settings prior to shooting and the artefacts
with the right option selection before publishing.

The noise:
This is rather easy to get under control. Since you know
that you're heading for a long exposure time, make sure
that the ISO setting is low, 100-200 ISO. That should do it!

The compression artefacts:
This is responsible for the "muddy" rendition of the uniform
black areas in the shy. To keep this in check, select highest
quality compression before saving/publishing to jpeg. This
ugly artefact is a side effect of too high jpeg compression.

I hope I answered you question.
If yes, I want to see your next shot.

Have a good day… and night's shootings.

Kodiak
Groovy Shootings
Image Mιdia
www.kodiakmedia.at

• • • • • • • • • • • • • • • • • • • • • • • • • • • •
In photography, light is free but catching it is not!
• • • • • • • • • • • • • • • • • • • • • • • • • • • •

  

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Pipewelder Registered since 09th Jan 2013Fri 24-May-13 12:49 PM
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#2. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 1


Iuka, US
          

Thanks. So for a given ev a longer exposure at a low iso is better than a shorter exposure at a higher iso? I will try that again.

I will try raw and fine too. I haven't quite got the hang of processing raw yet.

Thanks for the information.

Visit my Nikonians gallery.

  

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nrothschild Silver Member Neil is an expert in several areas, including camera support Nikonian since 25th Jul 2004Fri 24-May-13 01:07 PM
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#4. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 2


US
          

>> So for a given ev a longer exposure at a low iso is better than a shorter exposure at a higher iso?

That is a general rule of thumb, but in an image such as yours, it isn't necessarily quite that simple.

You did not indicate your exposure, nor does your image contain the shooting EXIF. But if you significantly reduce ISO (slowing the shutter speed to compensate) you will significantly increase the star trailing. You may or may not want that. You have to find a happy medium between the star trailing you will accept and the noise you will accept.

Noise reduction tends to treat stars like noise. There is not much difference between the odd bright noisy speck and a faint star, especially if there is no trailing. I think that tends to limit the amount of NR you can apply, and that has to be considered too.

_________________________________
Neil


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kodiak photo Silver Member Nikonian since 28th Feb 2013Fri 24-May-13 01:36 PM
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#5. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 2
Fri 24-May-13 03:16 PM by kodiak photo

Montrιal, (Qc), CA
          

*
Hi Gerald, aka Pipewelder (I like that!)

My starting setup is:
ZERO everything!
Manual Mode. Manual focus.
Matrix metering.
ƒ8-ƒ16
Iso 100
No EV!

At dusk, the moon may be in the shot BUT NOT LATER!
The darker the sky the thinner the mood.
Better is none at the beginning.

Manual focus at ∞ minus a tad.

Take a first shot. Read on screen if the exposure is ok.
At this point, exposure adjustments should done only
through +/- EV.

Take your time, you got the whole night (if you previously
made proper arrangements with the weatherman!)

SHOOT RAW! ONLY RAW! ALWAYS RAW!
I could help you there if required…

Have a good time!

Kodiak
Groovy Shootings
Image Mιdia
www.kodiakmedia.at

• • • • • • • • • • • • • • • • • • • • • • • • • • • •
In photography, light is free but catching it is not!
• • • • • • • • • • • • • • • • • • • • • • • • • • • •

  

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aolander Silver Member Nikonian since 15th Sep 2006Fri 24-May-13 01:01 PM
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#3. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 0


Nevis, US
          

I'm not seeing the "small red specks" even on the larger view, but these may be hot pixels which show up more with long exposures. In camera "long exposure noise reduction" can be used to removed these.

http://www.kenrockwell.com/nikon/d200/d200-dark.htm

Alan

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Pipewelder Registered since 09th Jan 2013Sat 25-May-13 04:35 PM
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#6. "RE: Night Photography- Small red stars with no trails"
In response to Reply # 0


Iuka, US
          

Thanks to All for your help. I turned on the Long Exposure Noise Reduction and kept ISO near 100 and noticed the specks gone. Exposed for the same amount of time (1:15sec ish) and everything was better but I need to try again tonight to recreate the image.

But Thanks to All

Gerald

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