The FTF3015B-A is correct I have it on my RC10 there is no issue with backfocus its the same length as the original so I dont know where that
idea comes from . I also got the microfocus kit for mine as well . I considered the Moonlite but you cant change the motor to another focuser if you wanted to later on .
Other thing to remember is that the FT is not a crayford and as such will support much heavier loads and also accounts for its extra expense.
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