Quote:
Originally Posted by alpal
A good effort.
I always wanted to try a barlow lens for imaging.
Out of interest - what brand & model of Barlow did you use
& did it screw into your coma corrector or just sit in the focuser somehow?
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Thanks for your kind thoughts Alan. The Barlow is a GSO ED 2" 2x Barlow that cost me $69 from Andrews in Sydney. I didn't use a coma corrector at all - at f/12 I thought I'd be OK and there wasn't much evident - and I screwed my UHC-S filter to the end of the barlow. I inserted the QHY8L into the barlow as though it was an eyepiece and put the whole lot into the 2" eyepiece holder that came standard with the Skywatcher newt. I didn't buy an expensive barlow as it was my cheap way of testing my guiding setup at longer focal lengths. There was chromatic aberration visible but that was adjusted in DSS. However after this result I'll definitely try it on some other smaller targets!
Quote:
Originally Posted by RobF
Top effort Mario. You really have the rig singing to pull that one off so well.
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Thanks Rob! As for my rig there is one mantra that I recite before each session - "collimation, collimation, collimation!" When I'm setting up I spend about 10-15 minutes ensuring my collimation is as good as I can get. I use a laser for the secondary and a Cheshire for the primary as well as ensuring the secondary is centred. I've also added an old computer fan to the end of the scope to get the mirror cooled down quicker.
Quote:
Originally Posted by marc4darkskies
Nicely done Mario! 
Cheers, Marcus |
Thanks Marcus - still a long way to go to get to your standard but I'm working on it!!