10" GSO Truss RC focus Point

[TrevorW]

I have acquired one of these from a fellow site member at a great price including a motorized Moonlite 2.5" focuser. Just need some advice re back focus planning to use with both a QHY183c and QHY268c camera no OAG and was wondering what length extension tubes for both visual and camera would be required to obtain focus. The Moonlite has a 1.5" draw tube could be 1" just depends on where you measure too from

[brisen (Brian)]

Hi Trevor

I believe it is 250 mm - measured from the back plate of the tube.

Brian

[Joshua Bunn (Joshua)]

Hi Trevor,


You could also see where it brings the moon to focus behind the backplate, doing that in a dark place should be quite easy to see.


regards
Joshua