Sunday, March 31, 2013

Gull to Thor Widefield

Gull to Thor Widefield by S Migol
Gull to Thor Widefield, a photo by S Migol on Flickr.
Via Flickr:
Gull to Thor Widefield as seen in the backyard. Used a Pentax SMC TAKUMAR/6x7 1:4/200mm lens with adapter to fit the Pentax K10D camera. IDAS LPS P2 filter on the lens with a Baader Ha filter inside the adapter. This was required because the camera is a full-spectrum modifed one and there was sigificant unfocused light from the lens.

This is a stack of six 1200 second subs that had been calibrated with Maxim and stacked in Pix Insight.

My first effort with a monochrome image, it's a pretty grungy one. In the process of working on the file, I resampled to 50% to remove evidence of bayer lines due to the lower resolution of the red channel.

This turned out better than I'd expected, given the conditions. I'm glad that I tried it. I'll give it a try again another time, but with a non-converted camera or add an IR filter in the mix.

Here's the platesolve from PI:
Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
-0.003476522382 -0.000033246131 +3.384950874320
+0.000028792576 -0.003478460023 +2.208816745728
+0.000000000000 +0.000000000000 +1.000000000000
Resolution ........ 12.519 arcsec/pix
Rotation .......... 0.495 deg
Focal ............. 100.01 mm
Pixel size ........ 6.07 um
Field of view ..... 6d 43' 45.2" x 4d 28' 20.0"
Image center ...... RA: 07 09 26.127 Dec: -11 48 38.53
Image bounds:
top-left ....... RA: 07 23 08.458 Dec: -09 35 10.16
top-right ...... RA: 06 55 54.322 Dec: -09 31 51.77
bottom-left .... RA: 07 23 11.430 Dec: -14 02 58.90
bottom-right ... RA: 06 55 30.463 Dec: -13 59 36.75