Prism dedicated to binos only or not?
Posted 16 August 2013 - 10:10 AM
2nd question: Will I ever need to buy a 2" diagonal or can I just use the prism diagonal? The prism diagonal is advertised as having a 34mm clear aperature. It seems like I read somewhere that the 8" EdgeHD is limited to 31-32mm due to the baffling anyway, so would I ever benefit from using an eyepiece with a field stop larger than 32mm-ish anyway? I may be mistaken on these numbers.
Posted 16 August 2013 - 10:37 PM
Just slip in your regular diagonal for normal use.
Also this. You can use even a 31mm Nagler with the EdgeHD 8" with great results. Don't be worried about using a 2" diagonal.
My advice though to everyone using an SCT is to always keep the back focus as short as possible. I recommend the Televue Short SCT to 2" adapter. This will work with the 2" nose attached to the front of the T2 Prism and this would allow you to easily swap from a 2" diagonal to the Binoviewer. The Short SCT adapter though will only allow a 2" diagonal with a short nose to fully seat (Televue makes a short diagonal, but I think there are some others).
The shorter you make the light path, the better.
Posted 17 August 2013 - 09:17 PM
Posted 18 August 2013 - 10:08 AM
Posted 18 August 2013 - 01:45 PM
Seriously though, a few millimeters won't matter. When it really matters is when you can reduce 30mm or 40mm, but avery little bit does help. Then it simplly becomse cost/value and each man or woman for themselves...