Been meaning to post on this.
Another CN member that I PMed with purchased from Ultimate Night Vision and Ultimate told him that they built up his system using the Vyper 14 chassis rather than the PVS-14 chassis.
Now the Vyper 14 chassis has been around a bit but I was not really familiar with it, so I did some research.
As it turns out, the Vyper chassis is a composite chassis that takes the place of the PVS-14 chassis (the part that holds the tube). It still uses the PVS-14 objective and still used the PVS-14 power supply and eyepiece, but the primary difference is that unlike the PVS-14, the objective on the Vyper chassis is removable without having to take the device completely apart. There is a threaded ring (Burk ring) that secures the PVS-14 objective and this makes it possible to essentially just screw the objective off.
This would make it possible to make an adapter so that the Vyper 14 could be used at prime focus!
Now the other good news is that you can buy the chassis and retro-fit it to a PVS-14. I think the price is something like $260. Since you use the same power supply, objective and the same eyepiece, it would be a pretty straightforward teardown and rebuild.
So, this may be a great upgrade to PVS-14 owners that want to have the option of doing prime focus!
Edited by Eddgie, 28 May 2020 - 08:59 PM.