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Old 20-11-2012, 08:58 PM
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rcheshire (Rowland)
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ST-8300 image settings - where did the nebulosity go?

The attached screen shot, starting from the left - a single light frame of 6 minutes, taken under moderately light polluted skies. The middle a 6 min exposure at a dark site.

Cropped - the image on the right is the calibrated, debayered, registered, integrated result of 34 frames - a total exposure time of 2hours @ -20C, 200mm Canon prime, stopped down to f/6.

Is the obvious lack of nebulosity a case of truncated pixel values or is it a processing artefact.

Regards,

Rowland.
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Last edited by rcheshire; 21-11-2012 at 04:39 PM.
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Old 20-11-2012, 10:46 PM
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alocky (Andrew lockwood)
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Two things that you haven't mentioned, and apologies if you've done it;
1. Did you register the sub frames before integrating them?
2. Have you applied a screen transfer function - or done a histogram stretch?
The nebulosity around the Pleiades doesn't show up without a bit of stretching.

Edit - I see you've used these processes, so maybe that's not the problem then. You haven't been playing about with masks, have you?

cheers,
Andrew.
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Old 21-11-2012, 09:52 AM
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rcheshire (Rowland)
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Thanks Andrew. The more I think on it, the probability is camera settings. I noticed during the session that the images had a binarized look about them.
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