need measurements of how far down 290 mini sits in helical focuser

miwitte

I am trying to fit the ZWO OAG into a 8" OAG image train and i have the moonlite which makes spacing very tight. I have good spacing with the stock ZWO OAG components and the 290 mini and wanted to know if i swap out the 1.25 holder on the ZWO OAG and replace with the helical focusre if the 290 can go all the way down to the top of the ZWO OAG stalk. and detailed drawings showing how far the 290 would go into the helical focuser would be helpful. I dont want to buy and i cant reach focus with the focuser because its too large.

derpit

No, not completely. It will stop some 4mm above the base plate (so the sensor is 12.5mm above the plate).

It fits perfect for my ASI1600/EFW/OAG setup, in 'default configuration' the 290 is in focus turning the helical 2.6mm out (i.e., approx. midway in its range).

Yuck, sorry - I just noticed that I had removed the small black ring at the end of the camera for some tests. So that one is ~2mm above the bottom -> 10.5mm

miwitte

Thanks i made up a drawing and it may fit ill have to play around with spacer to get the 1600 and 2900 at same focus.

ZWO focuser and OAG.JPG

katherine.tsai

Good to know