Hello, I bought some time ago from a friend of mine a Zeiss 50/540 lens in cell. We believe it to be a C50/540. Now I would like to get it intubated and I received a call from the shop, if I am going to view straight-through or if the tube should be short enough for a diagonal and which optical length. I believe they were meant to use for straight-through viewing, as I believe Zeiss prism diagonal were M44 and had matched spherical aberration that corrected the residue of bigger instruments. However I would think they are not suited to a 50mm f/11. I would also have some other diagonals, the most old-fashioned are a .965" and a 1.25" prism diagonal. Your valued opinion would be most welcome. Thanks a lot in advance, Daniela
50/540
Started by daniela, 01/19/2009 10:42AM
Posted 01/19/2009 10:42AM
Opening Post
Posted 01/27/2009 04:01PM
#1
Daniela
what you want to do with the lens ? Build a finder, then do it maybe straight with a 2" focuser for 2" eyepueces, or build a real telescope , then you need to select first a focuser
if you want to use a stardiagonal the backfocuse shall be about 130 mm behind end of fully racked in focuser so you can use any normal eyepieces
regards
Markus
what you want to do with the lens ? Build a finder, then do it maybe straight with a 2" focuser for 2" eyepueces, or build a real telescope , then you need to select first a focuser
if you want to use a stardiagonal the backfocuse shall be about 130 mm behind end of fully racked in focuser so you can use any normal eyepieces
regards
Markus
clear skies
Markus Ludes
APM-Telescopes/Germany
Posted 02/06/2009 01:32AM
| Edited 02/06/2009 01:34AM
#2
Hello Daniela,
I have a C50/540 that I use with a Borg Series 80 tube and focuser. This is Borg Part #6000. I had Ashley Stevens from PreciseParts make a special adapter that holds the Zeiss lens and screws into the Borg's threads. Ashley is an artist with a lathe - it was not cheap in the end, but it is a great little telescope. I am hoping to use it with a LSS Ha filter someday.
best regards,
Steve
I have a C50/540 that I use with a Borg Series 80 tube and focuser. This is Borg Part #6000. I had Ashley Stevens from PreciseParts make a special adapter that holds the Zeiss lens and screws into the Borg's threads. Ashley is an artist with a lathe - it was not cheap in the end, but it is a great little telescope. I am hoping to use it with a LSS Ha filter someday.
best regards,
Steve
Funding Member
