Hi all-
Hope you don't mind the brief step outside the solar system -
I've been wanting to try using my B&W webcam on a small bright deep sky
object and had a first opportunity from the dark skies of Cherry
Springs State Park and Black Forest Star Party last weekend.
The skies were very dark - the seeing quite unsteady with much
scintillation. The luminance image is made by stacking streams with 30 second exposure frames (max for the DMK21BF04) - a total integration of about 45 minutes using the 10" mak/cass at f9.8. The video frames were surprisingly low in noise - some hot pixels (of
course I forgot to do a dark frame) and a little amp glow were removed in Photoshop. I shot RGB frames using the traveler which was piggybacked on the 10" and 1200 mount. The low res color images were pretty hard to work with - I had to do a substantial amount of color
tweaking in Photoshop.
I haven't done any deep sky work in quite a few years. For processing I used my planetary techniques in Photoshop. I was surprised and pleased that the webcam could do such a decent job.
best,
Alan
Hope you don't mind the brief step outside the solar system -
I've been wanting to try using my B&W webcam on a small bright deep sky
object and had a first opportunity from the dark skies of Cherry
Springs State Park and Black Forest Star Party last weekend.
The skies were very dark - the seeing quite unsteady with much
scintillation. The luminance image is made by stacking streams with 30 second exposure frames (max for the DMK21BF04) - a total integration of about 45 minutes using the 10" mak/cass at f9.8. The video frames were surprisingly low in noise - some hot pixels (of
course I forgot to do a dark frame) and a little amp glow were removed in Photoshop. I shot RGB frames using the traveler which was piggybacked on the 10" and 1200 mount. The low res color images were pretty hard to work with - I had to do a substantial amount of color
tweaking in Photoshop.
I haven't done any deep sky work in quite a few years. For processing I used my planetary techniques in Photoshop. I was surprised and pleased that the webcam could do such a decent job.
best,
Alan
Attached Image:
Alan Friedman
http://www.avertedimagination.com