I think there is something basic that I may not be understanding. Case in point concerns my Moravian G2-8300 camera with the built in filter wheel.
On the Moravian site it indicates that the BF to the camera window is 29mm. To this I want to add a low profile t adapter which has a size of 7.5mm. That is, on the camera side it is flat and bolts to the front plate. On the telescope side there are female t threads. So, it would appear to me that anything mounted and fully screwed into the t-thread would be extended by exactly 7.5mm making the BF 36.5mm. But no. On the Moravian site the value is given as 33.5 mm. Where did 3mm go?
So, I wrote to Moravian about this and received the following advice:
The low-profile T-thread adapter height is 7.5mm, this is true. But it definitely does not mean the BFD is 7.5mm. For BFD of various camera configurations refer to
http://www.gxccd.com/art?id=396&cat=1&lang=409
What am I missing?
Thanks,
Peter