image submission - NGC 2392
Posted: Tue Jan 15, 2008 4:41 pm
hi friends,
I have conducted an experiment with a monochromatic CCD and a barlow lens I attached to my f/9 system. seeing met my intentions to do some HR DSI that very night, luckily. curious enough to see, that aligning the luminance frames taken at f/18 was very hard to achieve, as r,g,b was taken at f/9.
all frames 1x1 binned.
the field curvature is dramatically different. it was not only a matter of different size,...it was the field.
I had to this in photoshop,...it was hard,...but it worked fairly enough to present this l-rgb version here.
data:
luminance:
9"f/18 TMB Apo using televue big bralow
SXVF H36 - crop (as I told you less than 50% remained...it'S the files issue that I will have to solve with a decent flattener...
l = 18x4 minutes
7 dark frames
r,g,b 9"f/9 5x4 minutes each.
maxim color calibration:
r=1.3
g=0.8
b=1.1
this was trial and error stuff, since I will have to do a G2V star color balancing with the entire system...
http://www.stargazer-observatory.com/NGC2392-LRGB.html
thanks for taking a look.
Dietmar
I have conducted an experiment with a monochromatic CCD and a barlow lens I attached to my f/9 system. seeing met my intentions to do some HR DSI that very night, luckily. curious enough to see, that aligning the luminance frames taken at f/18 was very hard to achieve, as r,g,b was taken at f/9.
all frames 1x1 binned.
the field curvature is dramatically different. it was not only a matter of different size,...it was the field.
I had to this in photoshop,...it was hard,...but it worked fairly enough to present this l-rgb version here.
data:
luminance:
9"f/18 TMB Apo using televue big bralow
SXVF H36 - crop (as I told you less than 50% remained...it'S the files issue that I will have to solve with a decent flattener...
l = 18x4 minutes
7 dark frames
r,g,b 9"f/9 5x4 minutes each.
maxim color calibration:
r=1.3
g=0.8
b=1.1
this was trial and error stuff, since I will have to do a G2V star color balancing with the entire system...
http://www.stargazer-observatory.com/NGC2392-LRGB.html
thanks for taking a look.
Dietmar