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  #1  
Old 27-06-2014, 11:18 PM
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cometcatcher (Kevin)
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Show me your DSLR noise and amp glow

Now that I have camera number 3 I am ever more curious what other DSLR cameras are like, or compare to the ones I have.

If I could be so bold to ask a big favour to those with various DSLR cameras to do a comparison for me by posting pics of your amp glow? To keep things equal I need a 10 minute dark frame at ISO 1600 at 22C or close to it. No pre processing other than to convert to jpeg. The reason I need these settings is to show the noise without stretching.

Here's mine. The old Nikon D70s is pretty bad. Even at 1 minute it glows and is noisy. The Pentax K-x is much better and more evenly distributed. The Pentax K-5 glows brighter than the K-x at the bottom right but less at the top left.

I'd really like to see what an 1100D looks like if any 1100 D owners can oblige.
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  #2  
Old 28-06-2014, 12:18 AM
raymo
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One good turn deserves another.
1 dark frame, 1100D, 10 mins, 1600 ISO, approx. 21.5 Degrees ambient.
raymo
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  #3  
Old 28-06-2014, 03:52 AM
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cometcatcher (Kevin)
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Thanks very much Ray! Wow that's really quiet.
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  #4  
Old 28-06-2014, 10:46 AM
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JohnG (John)
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As you asked so nicely

1 x Dark @1600 ISO, 600 seconds with a Canon 60Da.

1 x unstretched and one x stretched to the max..

Cheers
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  #5  
Old 28-06-2014, 11:02 AM
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Yes, I never heard a sound for the whole 10 mins.
raymo
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  #6  
Old 28-06-2014, 12:44 PM
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cometcatcher (Kevin)
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Thanks John, that's even quieter! What was the ambient air temperature?
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  #7  
Old 28-06-2014, 12:57 PM
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Quote:
Originally Posted by cometcatcher View Post
Thanks John, that's even quieter! What was the ambient air temperature?
Around 18.5c I believe, inside the house.
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  #8  
Old 29-06-2014, 11:39 AM
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SimmoW (SIMON)
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This is a good thread, quite interesting to see all the results.

pouring with rain right now, nice and cozy in my 21c house, so I'm baking a sub for you right now!
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  #9  
Old 29-06-2014, 12:08 PM
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Ok here are my 2 examples.

The first horrid one is ISO1600 unstretched, the second better one is 400. Hmm, I might try 400 in my shots...

it'd be nice to see some of the $10,000 CCD guys post similar examples. And a Canon 5D mk 3, and a few Nikons.
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  #10  
Old 30-06-2014, 02:20 PM
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Hey Raymo and John, I can't see anything in your pictures.
Didi you do something wrong? haha....
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  #11  
Old 30-06-2014, 03:28 PM
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Har Har, that's as silly as my post.
raymo
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  #12  
Old 30-06-2014, 03:43 PM
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Ha, here are my best 3 astrophotos I've ever taken

Canon EOS 5D Mk I I I

1600, 800 and 400. Very pleased! I gotta start using this baby!

The original pics appear better than here, as usual. Much less noise pattern.
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  #13  
Old 30-06-2014, 06:09 PM
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Wow my cam is way noisier than that

This is just a 10 minute exposure at ISO1600 with any lens on (and the lens cap ) ?
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  #14  
Old 30-06-2014, 06:30 PM
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Yep, in fact my 40d shots were with no lens , just the bayonet cover on.
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  #15  
Old 30-06-2014, 06:53 PM
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This is my miserable attempt... Canon 1100D at ~21.5C ISO1600 600s with all noise-reduction functions disabled.

When I look at the actual raw image in Canon tools, the coloured pixels are more saturated.
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  #16  
Old 01-07-2014, 02:32 PM
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Quote:
Originally Posted by SimmoW View Post
Ok here are my 2 examples.

The first horrid one is ISO1600 unstretched, the second better one is 400. Hmm, I might try 400 in my shots...

it'd be nice to see some of the $10,000 CCD guys post similar examples. And a Canon 5D mk 3, and a few Nikons.
FLI Proline 16803 1x1 binning -30C 600 second master dark, I boosted it in Photoshop like I normally would do to a light exposure. The jpeg is a bit small, there are some hot pixels in there but its also pretty clean.


Greg.
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  #17  
Old 01-07-2014, 02:38 PM
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That's more like it! I can't see much right now on my mobile phone, but it looks like you forgot to turn the camera on! :-)

Can u post the unstretched version, so we can all have a cry?

This is proving to be a great testing resource.
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  #18  
Old 01-07-2014, 11:46 PM
Star Catcher (Ted Dobosz)
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Hi
Here are some darks from a Canon 6D. No stretching or noise reduction.

Starting with ISO1600 on left through 800 and then ISO400 on right. Temperature about 20C.
Ted
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Last edited by Star Catcher; 02-07-2014 at 10:36 AM.
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  #19  
Old 04-07-2014, 03:02 PM
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very good results. Now, if only someone with an SBIG 8300 cam chimed in...
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  #20  
Old 04-07-2014, 03:29 PM
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Whilst it is not 600 seconds, here is a Dark of 30 minutes @ -20c with a Moravian G2-8300.
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