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I present you an image of the Flaming star nebula and the Tadpoles.

I have 2 versions. Ha only and HOO.

I started with 4 panels mosaic shot with the 130PDS, each panel is ~2h exposures. Then I shot another 7.5h with the Canon 300 F4 L lens, but the result was awful, compared to the mosaic. So I added this only in a small amount and only on the darker areas of the image.

For the O3 image I only used the Canon lens. The IS element inside gives me a lot of headaches, and I have coma in some corners, other corners are out of focus, etc. And it behaves differently each session.
Not only the IS was not playing nice, but I also had focus shift due to temperature drop and I did not refocus.

The camera used was the ZWO ASI1600MMC, cooled to -15C.

180s subs at 300gain with the 130PDS and 300s subs at 139 gain with the Canon lens.

Mount: AZ-EQ5.

The lens was wide opened and the newton was corrected with a SW coma corrector, hence the halos around the brighter stars.

Guiding: OAG with 130PDS and side-guiding with a 200mm lens for the Canon lens shots.

Software: APT and PHD for acquisition; DSS, APP, StarTools, Registar, GIMP for processing.
When blending the O3 I had to abuse star reduction, star removal, heavy blurring, masks, layers, etc. for a decent result.

Link to a better resolution and other details: http://www.astrobin.com/315278/D/

Thanks for watching,

Alex

IC405-IC410-F300-F585-2017-10-02-Ha_p04.jpg

IC405-IC410-F300-F585-2017-10-02-Ha-F300-2017-10-17-O3_p05.jpg

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