Steve,
From my experience they are the equal of the Pentax and Meade and almost the equal of the Nagler & Pano's.
Having said that though I doubt that you would be able to "see" the difference. Then again the Sieberts are cheaper than the Naglers.
Go to the website and see the comparisons made between the Ultras and Naglers. The similarities are amazing.
Also,Sieberts make up the lenses for you after you have placed the order.
Quote:
Originally Posted by janoskiss
John, have you compared the Sieberts with some of the more "mainstream" widefield EPs, eg Pano, Nagler, Pentax, Meade SWA/UWA, LVW & clones ...? How do they stack up?
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