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D80 RAW format problem-- making a dark flat for astrophotography not working

Dr Garry

AU
3 posts

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Dr Garry Registered since 11th Sep 2012
Tue 11-Sep-12 11:19 AM

Hi All:

I'm a noobie tinkering with astrophotography. One of the things you do is to make a series of dark flat images, which are 1/4000 ISO 100 exposures with lens cap and eyepiece cover on. The idea is to capture wonky sensor elements (I think). You take these in NEF/RAW format.

A dark flat should look completely black with the odd wacky pixel. But my dark flat RAW images are cacophonies of coloured "snow". My understanding is that just ain't right.

When I make a dark flat using JPEG/Fine/Large it looks just like it's supposed to: entirely black with some wonky pixels. But you can't use jpegs for astrophotography.. they have to be RAW.

Any ideas? I open my images in Paint Shop Pro X2 just to see what they look like, and process them with DeepSkyStacker. My only thoughts are:

* Paint Shop Pro X2 does not open the Nikon D80 RAW format correctly.
* I should convert Nikon NEF to some normative RAW format.
* There's a tiny elf in my camera lighting a firecracker when I take the image.

Thanks for your time
Garry

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