Friday, February 27, 2015

Rosette with the Pentax K10D DSLR


This image of the Rosette Nebula was taken in the backyard during January 2015.

Taken with the Pentax K10D DSLR with smc P-A* 1:4 300mm lens.  An IDAS LPS P2 filter was used on the lens to improve contrast.

This is not a great picture, just OK.  The upper right shows issues with framing and a green gradient due to DSS' mosaic process.  The focus is soft across the whole field, largely due to operator error.

Eventually I'd like to get the camera back into the field to try a wide target like this again.  Galaxy season is happening now and while it's fun to consider, I'm not sure if the DSLR would be sensitive enough to make much of the galactic light show.  Would be worth a shot to get the whole Markarian Chain.


Thursday, February 26, 2015

Sharpless 274 with the QSI 683

First real picture with the new camera.




As noted in the earlier post, this was a sum of RGB and Luminance data.

The RGB comes from 7 Blue, 9 Green, and 9 Red subs at 600 second durations.
The Luminance is from 15 subs also at 600 seconds.

Shot using the Stellarvue SV4 scope with flattener.

I'm happy enough with the image.  The sky isn't fully dark as there's still glow from streetlights.  I look forward to getting up to MBOSP to see how it looks different up there.

Wednesday, February 25, 2015

SH2 274 in Process


A view of the workspace in PI as I'm processing the data from SH2 274 AKA "Medusa Nebula."

I started gathering data before the new moon and up to first quarter.  Tried using 2x binning on color data but didn't like how it appeared afterwards.  Ended up using 1x binning for everything.

The windows seen here are still linear, post DBE, with just an unlinked STF for display purposes.

The RGB comes from 7 Blue, 9 Green, and 9 Red subs at 600 second durations.
The Luminance is from 15 subs also at 600 seconds.

I noticed gradients that needed to be flattened with DBE before this screenshot was taken.  The Luminance image needed to bring up the upper left corner.  This is either due to a bias from streetlights.  The RGB had a hot red spot in the middle, centered over the nebula.  I didn't think that this glow was from nebulosity as it was too evenly dispersed.  DBE removed both with minimal trouble.

At this point, I'm going to freeze the work progress to get some JIT learning regarding noise reduction in the linear state before the color and lum data are merged.