What’s the distance to the sensor -ASI 071

aristo

The ESPRIT 100 telescope manual requires 63 mm from flattener to the sensor

Camera has 16.5+21=37.5

Telescope extra spacer is 8 mm

That is 45.5 mm total

For back focus Needed to know the distance from the camera open to the sensor .

olecuss

I'm not entirely sure this is what you are looking for, but I think the FFD for the ASI071 is 17.5mm?

kurt

I recently asked the same question, I have yet to get a response, according to ZWO online specs. it says 17.5mm according to the quick start manual it says 6.5mm, if you go with the included extensions, and 17.5 mm it comes out to the recommended 55mm back focus, also a comment made by one of the telescope manufacturers, I have recently contacted, made the comment that ZWO was smart in their design, as to offer their cameras with the 55mm back focus basically making it a plug and play setup matching that of DSLR’s, which further leads me to believe it is 17.5mm.

aristo

Thsnk yo the 17.5 mm is what I have asked for. Still dont understand what’s does 6.5 mm mentioned in the attached paper means

katherine.tsai

Aristo wrote:

Thsnk yo the 17.5 mm is what I have asked for. Still dont understand what’s does 6.5 mm mentioned in the attached paper means

If you do not attach the T2 11mm ring, the distance from the sensor ton the upper thread of the camera is 6.5mm.