R: [MaxImDL] Identifying a Problem in the Optical Path


Jan 11, 2015

 


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#58819 Jan 11, 2015

Hi Steve,







While i see on the Red channel, i cannot see it on the dark. I see some

lines in the corner.







Which parameters for download are you using in Maxim ? It seems some kind

of Venetian Blind effect which in oast with Maxim was due to some particular

setting..which now i do not remember...in the group for sure someone can

help.







Red channel seems also not in perfect focus.







Regards



Fabio







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(Astronomy)







Da: MaxImDL@yahoogroups.com [mailto:MaxImDL@yahoogroups.com]

Inviato: 11 January 2015 15:05

A: MaxImDL@yahoogroups.com; SBIG@yahoogroups.com

Oggetto: [MaxImDL] Identifying a Problem in the Optical Path











I have noticed for some time that I get an uneven separation or maybe better

described as an area near the top of the STL-11002M chip that is darker then

the rest. It's more prominent in the flats images which I take using an

XLFlatMan panel. The panel is about 8" from the front of my 12.5" f/9 RC

mounted on my southern observatory wall. I take the flats when it is

completely dark inside the observatory and use ACP's AutoFlat script to

adjust the ADU which I have set at 32,000. The same discrepancy can be seen

in the raw light images. I've uploaded a master flat and raw image to see in

each. what it looks like is a darker area, straight line dividing, about 150

pixels down from center top. I've uploaded a raw 2x2 fits file and a master

dark that shows the issue very well. Looking at the CCD chip from the open

end of the telescope doesn't show any obstruction that I can see. The

imaging train consist of the STL-11002M/FW10/Pyxis 3" rotator, and several

AP spacers to bring me to the proper back focus distance. The files can be

downloaded here:







www.dropbox.com/s/gzlnj9i3uwjgjub/NGC1788-S001-R009-C001-Red.fts?dl=

0







www.dropbox.com/s/t0g21ne7j2hlw6q/Flat%20Master%20-%20AutoFlat-PA310

-Red-Bin2-001-West.FIT?dl=0







Thanks for looking,







Steve











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