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What is the shortest back focus using T2 with QHY183?

What is the shortest back focus using T2 with QHY183?
« on: March 15, 2020, 04:29:33 PM »
Hello

I am interested in buying a 183 mono but I need shortest possible back focus using T2 thread.

I can see that stock adaptor exposing T2 female thread will need a back focus of 18 mm - this is too long.

However, I have seen somewhere that there is a 020056 adaptor which will expose a T2 male thread and give a shorter back focus of may be 13 mm - if this is true, this will be perfect for me.

However, all the diagrams I can find show the 020056 being used with other adaptors. Can this be used by itself?

If this can be used by itself, what is the exact back focus of (camera + 020056) not including the actual T2 male thread, which will be taken up at the female end?

How long is the male T2 thread?

Thanks