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Astrophotography and Sketching >> DSLR & Digital Camera Astro Imaging & Processing

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Hilmi
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Reged: 03/07/10

Loc: Muscat, Sultanate of Oman
Re: Funky diffraction spikes new [Re: Hilmi]
      #5676976 - 02/13/13 02:53 AM

Tom,

Sorry I missed your post about the battery. I had actually seen your topic, but I'm not keen on using the AC power adapter because the idea is to be as portable as possible. i.e. no dependence on external power sources. Although I do wonder if a battery grip will achieve the same. After all, it does move the battery to outside the camera body and it does carry 2 batteries.


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mmalik
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Reged: 01/13/12

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Re: Funky diffraction spikes new [Re: Hilmi]
      #5676989 - 02/13/13 03:16 AM

Quote:

I'm finding that with 20 darks my DSLR images are still full of noise even though the exposures are 20 seconds long.




Are you using in or out camera NR; if not then that would be the reason. Thx


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Hilmi
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Loc: Muscat, Sultanate of Oman
Re: Funky diffraction spikes new [Re: mmalik]
      #5677048 - 02/13/13 05:50 AM

I switched off the camera's built in long exposure noise reduction feature. I took plenty of exposures and then I took 20 darks.

The outside temperature was around 20 C, sensor temperature was 26 C. I also have version 2.x.x of the Canon 7D firmware if that makes any difference


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mmalik
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Re: Funky diffraction spikes new [Re: Hilmi]
      #5677060 - 02/13/13 06:16 AM

Try taking couple of in-camera NR control shots (for comparison I mean) in case out-camera NR is not fully eliminating the noise due to whatever reason, temp mismatch, etc. Thx

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