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Old 08-09-2016, 11:41 PM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
There it is! Totally convincing and successful despite the seeing. You're up and running and hopefully addicted, should the air improve.

We used to manage 1 hour subs with a C11 on an EQ6. Our technique included having it intentionally very east-heavy to handle RA backlash, and having a great big spring (about a foot long) pulling the dec axis round, also to take up backlash. We put a 3 or 4 foot long aluminium strut between the nose of the scope and the counterweight. Permanent pier, and the polar axis intentionally out a tiny bit so that guiding was always to the south, working against the spring. Looked silly but it really worked. Mind you, we were looking over hot-tiled suburbia, and the seeing ghastly, so perhaps it didn't work as well as we thought it did.

Looking forward to more H-alpha galaxy shots, Colin
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