Quote:
Originally Posted by The Mekon
Matt, the T2 cannot be a 1.25' with a T2 thread. We might be getting a bit mixed up here as it is a mirror if it has silver coating. I am mostly interested in prisms.
This thought has come to me as I struggle with my UO 2" prism which is excellent optically - much better than a Bintel 99% dielectric that I have but not so good to work with mechanically. There seems to be a dearth of 1.25" prisms on offer. I will probably end up buying a Baader 2" dielectric with the clicklock, but thought first about a 1.25" prism which could also be used in my smaller scopes.
The ultimate solution is the Baader 2" zeiss prism which I think is over 400 euros. not sure I want to spend that much.
(and thanks Suavi - I have that article on diagonals that you linked)
John
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John, ..... the Baader T2 Zeiss #2456095 prism actually has a BBHS coated hypotenuse surface, the surface is first coated in silver, then copper before being sealed against any oxidisation.
Their T2 Zeiss and 2" Zeiss prisms have had the BBHS coating for the almost two decades, the use of the coating on the mirrors is only a recent development. Both are available in 1.25 (Actually the prism is slightly oversized at 35mm ) and 2" sizes. I have the smaller prism which has a female T2 thread (42x0.75) on the scope side and a male T2 on the eyepiece side. These can be fitted with either the 1.25" or 2" nosepiece or the Baader Quick Connect coupling.
I use the T2 Zeiss with the 2" nosepiece and the HD Quick Connect for my binoviewing and the 2" BBHS- Sitall mirror for mono viewing.
http://www.baader-planetarium.com/en...part-01b).html