I have an older (non-IS) NP101 for imaging with my small-ish 533MC-Pro’s sensor that I got used back in 2022. It works very well, and the smaller Petzal doublet vs the newer -IS models has no illumination issues. I’ve even used a D5300 Nikon (APS-C) and while I do see some dropoff on the corners, it was very fixable with flats.

So I got several accessories for this guy, including a WO rail that I put my guide scope on, a Vixen rail, an extra Vixen dovetail slot (to mount the ASIAir) and for good measure, the RAD-1074 to use for the 0.8X NPR-1073 — that last addition has been a LOT of fun.

For the few times I’ve profaned the sacred temple and used a…a…<scrambles for notes> “eyepiece”, it’s been exquisite. Squeezed any possible drop that can be had of 4” of unobstructed aperture. Stupidly sharp on planets and lunar details. Completely color-free—and not through lack of trying with >200X on lunar crater shadows. No color. Black.

An older (non-IS) NP101 may not be THE preferred solution nowadays; I’m just saying I can attest it works.

So…dumb question…anyone do the same thing with its big brother and use a first-generation (non-IS) NP127 for imaging? Other than the rear doublet being bigger, am I correct in assuming it’s just like the NP101 in that it’s flat, color-free, just a smaller illuminated circle?

Clear Skies,
Phil