[Shiraz (Ray)]

Originally Posted by Steffen

I always try to watch that everything that goes into the focuser tube (eyepieces, adapters, extension tubes) goes in all the way to the stop, and then clamp it down. That's the only way to make sure everything is square and wobble-free.

From limited personal experience (few samples of each) I much prefer the GSO Dob focuser to the SW one.

Cheers
Steffen.

Originally Posted by rustigsmed

thanks for the heads up Steffen, any experience on just the OTA? I have a DSLR and have heard there isn't enough inward focus on the GSO with a coma corrector? I'm not sure if thats correct either though? I know the SW is ok, although i believe there is a bit of inward protrusion in the light path.

Cheers,

Rusty

thanks for the comments.

Am in the process of testing it- chalk and cheese - the focuser now works well, the coma corrector works pretty well (collimated through it) and everything is nice and square and stable. This mod made a major difference.

not sure about the coma corrector problem - mine focuses with plenty to spare on the QHY8 but the focal plane is only a little way back from the front plate of the camera - not 55mm. You might consider the RCC1 coma corrector, which provides bags of room.