[TechnoBill]

Originally Posted by White Rabbit

I have the an Orion refractor and use thier flattner whilst my focal length is 714mm the flattener says is for focal lengths of between 300-600 it works fine.

http://www.bintel.com.au/Astrophotog...oductview.aspx

But the orion has the two inch tube on the back which means it would probably need to go in front of the adaptive optics which put the camera a long way back from the flattener. I dont think it will work. It would be nice if the two inch tube on the front of the orion could be unscrewed so I can then put it onto the back of the adaptive optics in front of the camera (with the relevant spacers).

Originally Posted by White Rabbit

You'll need some spacers as well to get the correct distance between the flattner and camera chip/ep.

Yup have all sorts of those.

Bill D