I run Orion¡¯s 8" f/3.9 astrograph on a tripod-mounted G11, with the Orion rings and an 11¡± Losmandy dovetail plate. The camera is an STF8300, around 5 lb all-up IIRC. ?I¡¯ve been happy with it and haven¡¯t had any stability issues. ?The tube should be rotated so that the focuser is parallel to the dec axis, in order to properly balance the rig when there¡¯s a camera hanging off the focuser. ?You will need a coma corrector. ?
When I got the scope, new from the Orion store, there was some play in the focuser. ?I was able to fix it by partially disassembling and adjusting the mechanism. ?I haven¡¯t seen any sign of the tube-flex issues that some people report for this scope. ?
You will need a coma corrector. ?
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On 2 Aug 2020, at 15:26, wa1vta01452 <
loeblt@...> wrote:
Hi Jim,
I have the 10" f3.9 astrograph, the bigger brother of the 8.? The 8" OTA weight with the supplied rings and a finder is close to 20 lbs. I can only tell you what I had to do to make the 10 a solid imaging platform. First, I mounted it on a pier, replaced the focuser with a motorized one. I needed better rings and got the Parallax rings. Adding a camera, guide scope, guide camera, dovetail added close to 10 lbs.?
When I owned a G8 and a 6" F5.9 Newt a few years ago it was just usable for imaging under good conditions and any breeze bumped the Newt around.?
?
Tom
