7D: Grainy sky pics

Started May 2, 2012 | Discussions thread
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mermaidkiller Contributing Member • Posts: 709
7D: Grainy sky pics

I am very happy with my 7d and use it for astrophotos as well. As long as I use post processing (stacking , noise reduction) I can go up to 3200 or sometimes even 6400 ASA to get a decent low noise.

But for time lapsing I need a lot of pictures which are grain refined in itself because the camera has to take every 20s ... 1 minute a picture using a time lapse controller such as an Aputure cable release or an Android device with a DSLT controller app.

Even when setting the C Fn II Image => Long exposure noise reduction to ON and High ISO speed noise reduct'n to STRONG, the pictures are rather grainy even at 1600. Strange, pictures taken indoor @ 3200 or even 6400 are less grainy when when the latter setting si set to NORMAL.

OK it can be removed by Photoshop, GIMP or DPP, but when I have hunderds of pics to be grain-refined manually...
What am I doing wrong ?

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Canon EOS 7
Canon EF-S 15-85 f/3.5-5.6
Sigma 10-20 f/4-5.6
Canon EF 85 f/1.8
Canon EF 50 f/2.5 Macro
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Canon Powershot S100

 mermaidkiller's gear list:mermaidkiller's gear list
Canon G7 X II Canon EOS 6D Canon EF 85mm f/1.8 USM Canon EF 50mm f/2.5 Macro Canon EF 24-105mm f/4L IS USM +3 more
Canon EOS 7D
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