The Astro-Photography Mailing List ------------------------------------ >I have an F4.8 RFT Newt. and wish to get a very precise focus for my >trusty Nikon F. >I have a SureSharp but find it useless for this scope. Why do you find it useless? I used mine on an f4 scope at one time and it worked fine. Chuck <aa6g@aa6g.org>