Milky Way 871mp 360 degree mosaic D800E

Started Sep 17, 2012 | Discussions thread
Astrophotographer 10
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Re: Temperature is critical
In reply to TheRidgeback, Sep 20, 2012

Hi Mac,

Yes that is certainly one way to do that and I did that on one set. But for 30 second shots is not that much of a wait for long exposure noise reduction and its done neatly in camera and a more perfect match of the exposure.

But subtracting a dark with DSLR images isn't that easy as most software packages are designed for CCD cameras and don't like colour images. Apply image function in Photoshop may do it. I've only ever done it using specialised software like Images Plus.

Bias frames are not needed for darks as the dark already contains the bias data.

Bias is used for scaling darks to create an adaptive dark which do not have to match exposure times of the light frame.

Flats are not needed for widefield lens imaging as Capture NX2 has vignetting correction (vignetting I found was very minor, you should see some of my RAW astro CCD images from a telescope - wow, they really need a flat to correct vignetting).

If you use a telescope then yes you would need flats.

Greg.

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