Deminishing returns.....

Started 3 months ago | Discussions thread
Saabster Regular Member • Posts: 265
Re: Deminishing returns.....

Kemo-sabe wrote:

82Virago wrote:

5 minute subs at Bortle 9 is too long regardless of filter.

I have 25 minutes of data at Bortle 5/6 no filter, 300mm f4 ISO 320, that looks better.

You have to pretty much always work some very short subs in, to get data in the core.

Could be issues in the processing, maybe post a single untouched sub. 16 hours of M42 should be mind blowing.

The whole astro thing is a learning curve. The fact you got 193 5 minute subs, means your tracking and focus techniques are working.

Get to a to a darker site, this much data on an object is outstanding and darker skies will make the most of it. I live in Bortle 9, so I have to travel to shoot, but the time is worth it.


16 bit jpeg sub

16 Bit TIFF can be downloaded here:

Unfortunately the dropbox link is for a JPEG file and not a Tiff file. If you could repost it I'd like to take a shot at it.

Based on what AstroZoid was able to pull from it, you have good data, but it definitely needs flat frame calibration to get rid of the vignetting/doughnut. there's ways of generating a synthetic flat after the fact, and while it has some improvement it's not a substitute for true flat frame calibration.

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