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Frank, I examined a photo of the Promaster scope from a 24hourcampfire.com review dated 10/23/08. While the eyepieces appear to be very similar there also seem to be some differences. For instance the knurled locking ring at the front looks wider on the Baader zoom to me and the zoom adjusting...

Owen, The importer says that the click stops are now accurately labeled and the new eyepieces are supplied with both 2" and 1.25" barrels. The optics and the housing are supposed to be unchanged so I wouldn't expect it to reach focus in the Pentax scopes. Henry

Thanks eitanaltman, for bringing the Baader zoom to our attention. I've posted a new thread comparing it to other zooms. If I were you I wouldn't be too quick to return it. Henry

Baader zoom arrived today. I had limited time to test it, mainly comparing it to the Zeiss zoom. I'll post a more complete review, but I can safely say now that its light transmission, contrast and color accuracy are superour to the Zeiss zoom. It's comparable to the very best complex eyepieces...

I have both the 1.25" and 2" adapters made by Zeiss. I use an APM 2" adapter for the Swaro zoom. It's actually intended for Zeiss eyepieces but works with the Swaro zoom if longer hex screws are substituted. My Nikon adapter is home made, but APM also offers a 1.25" adapter for the Nikon...

I don't have a Pentax scope, but I have the Zeiss, Swarovski and Nikon zoom eyepieces, adapted for use on astronomical scopes. I'll compare the Baader to those on an f/6.6 AP Stowaway and an f/5.6 Takahashi Sky 90. That should pretty well cover the same range of focal ratios it would encounter...

I ordered a Baader zoom eyepiece yesterday. It certainly resembles the Zeiss, but isn't really a clone. The Zeiss has 8 elements, the Baader 7. The Zeiss focal length range, eye relief (if the Baader spec is accurate) and apparent field at high magnification are different from the Baader. I have...