Keyhole / Carina Nebula HST

[dylan_odonnell (Dylan)]

12 x 180s Ha (Green)
12 x 180s OIII (Blue)
12 x 180s SII (Red)

Total 108minutes imaged in a single run last night with C9.25" Edge HD and Hyperstar w/ Baader 2" f2 tuned filters.

The shorter exposure times keeps the keyhole structure from blowing out too much. Processed with dark bad pixel mask, but no flats. PixInsight Dynamic Background Extraction, Morphological star reduction, and HDR transform with a star mask to protect the stars. Channels combined in Photoshop.

Looking forward to framing this better and using multiple exposure lengths for the whole nebula, though this framing shows the inner structure ok I think. The collimation was a little off on the Hyperstar so the stars aren't even across the field.

Higher Res : http://deography.com/wp-content/uplo..._clone-HDR.jpg

d

[Atmos (Colin)]

Looking reasonably good as a start, with more exposure time you'll be able to bring the noise in the background down a bit more.
Is it just collimation or is there some tilt in there as well?

[dylan_odonnell (Dylan)]

Originally Posted by Atmos

Is it just collimation or is there some tilt in there as well?

The hyperstar lens has three screws to control the tilt, much like the three collimation screws that control the tilt the secondary mirror that gets removed for the hyperstar. It's usually ok to set by eye most of the time but I really should've checked it better before I hit that crucial time of night when you decide to stop fiddling and start imaging before your targets move away