thanks. mine is an F6, so was told I'd need longer exposure times but will have less issues with Coma. still to try it out.
the focuser is a standard 10:1 2" crayford focuser and it has the 2" barrel to accept 2" lenses or adaptors. but that barrel can be unscrewed. so would the T-ring thread fit the focusser thread? I'm guessing not.
if so, I might get the T-ring and the 2" adaptor with the thread such as this.
https://www.bintelshop.com.au/Product.aspx?ID=7403
issue might be that it would increase amount of infocus travel required to reach focus.