Quote:I think there must be about 6 inch difference in the distance where my Barcon reaches focus and where my 2.6X Glaspath reaches focus, the Barcon being the longer. This is in my 4inch apo...point is, I think you are too long. I think a 1.2X or 1.5X Glaspath would be best with your scope.
Quote:Look again TanveerI see none of what u speak
Takahashi FS128, TSA 102, FSQ106N, Losmandy GM-8, Baader Mark V, Leica ASPH, Takahashi, Ethos and Panoptic eyepieces.
Quote:Tanveer or Eddgie,As Celestron lists the design backfocus distance of the 8" edge at 133mm and the 11" edge as 146mm could one of you try an experiment for me? Attach the MarkV's (without any GPC ) directly to the back of the scope without using any diagonal, in the case of the 8" a 2" to T-thread adapter should provide about the perfect distance ( i.e. MarkV = 123mm + T adapter = 10mm? = total of 133 distance), in the case of the 11" (MarkV = 123mm + 2" nosepiece = 20mm? total = about 145mm ). I surmise that the corrector lens in the Edge should work the same as the GPC or recommended barlow to help narrow the image and the resultant views should be about as good as possible with the widest views possible. Either of you care to try? ( I am considering getting an Edge 8" for use with MarkV's and this information would help me make a decision). ThanksRex
Quote:I have of course not used the Ziess one, but the Baader appears to perform about as good as I think a diagonal can perform.When used in my 6" APO, I could fine no difference between it and a Telvue Dielectric. Views were identical.It is not at all difficult to make a diagonal to prism to an excellent standard of quality, and the coatings on the Baader look quite excellent to me.I have no reservations at all about giving a 100$ recommendation to the standard T2. I personally believe that any difference between it and the Ziess prism will be to small to be seen at the eyepecie in any way, shape or form.That is of course only an opinion, but the unit appears to be flawless as compared to very fine, high reflectivilty mirrors.