PST Nosepiece adaptors

[Merlin66]

I see the PST nosepiece adaptors have come up again on the SnS boot sale..

Anyone considering a PST mod in the future should grab one while they are available.

Ken

[Tim]

Thanks Ken

[Dave Smith]

Thanks Ken. Does that mean that the host scope needs a 2" focuser?

Dave

[Merlin66]

Dave,

Yes, ideally the donor OTA needs a 2" focuser for these nosepieces...however...I recently modded a 90mm Meade "starter" scope and found the drawtube was near as d*&m 2" i/d so the adaptor just slipped in after the 1.25" eyepiece adaptor was removed.

Also, you really don't need a focuser between the OTA and the etalon.

The etalon just needs to be positioned 200mm inside prime focus, so its sometimes easier to remove the focuser from the OTA and replace it with a end disk, which has a 2" aperture - that way you don't have to cut the donor OTA to get the magic 200mm spacing.

ken

[Dave Smith]

Thanks Ken, I have one on order.

Dave

[Tim]

me too