Re: diagonal focusPosted By David Payne |
I just bought a new FS-78 and I am using a 2" televue diagonal and there is not enough "in focus" to focus with an eyepiece of shorter focal length than 8mm. An 8 mm Radian will just barely come to focus but a 7mm Pentax XL won't come to focus...and none of the eyepieces will come to focus with a 2x barlow...kind of exasperating when you figure all the time and money involved getting a new scope mounted and up and running and then discover that you can't get over 78x when using the 2" set up....and if you want to use shorter focal length eyepieces you must take off the 2" diagonal and the 2" ocular adapter,then put the 1 1/4" ocular adapter back in and then install a 1 1/4" diagonal...all this just to up your magnification..and then if you want to put in a long fl eyepiece again you gotta go through the process all over again...in the dark nonetheless...