336 replies to this topic

[AllanDystrup]

Hi Allan, Do you know the eye relief of the W eyepieces? 

Carlos

     I haven't come across a spec by CZJ of the eye relief for the wide field eyepieces, but as they are an improved Erfle type, I guess the eye relief should be ~15 to 20mm (?). I never tried one of the CZJ W eyepieces personally, as they are rather rare and therefore cost the equivalent of the nose of a 5. gen. jet fighter... 

 

     -- Allan

Edited by AllanDystrup, 01 September 2022 - 09:30 AM.

[Piggyback]

Zeiss W 31S widefield eyepiece featuring 70 degrees apparent FOV according to the 1986 Zeiss sales literature. Eye relief not given. Hope this helps.

[Most2]

Hi folks. Does anyone know how the slow motion mechanism on a Telementor T-1 mount works. Advise for the amount of friction settings on the RA DEC lock/clutches and how it affects the slow motion knobs? Just acquired a Type 1 Telementor. Lovely optics and mount. Thanks. Mark

Edited by Most2, 06 May 2025 - 10:09 PM.

[Astrojensen]

Hi folks. Does anyone know how the slow motion mechanism on a Telementor T-1 mount works. 

As per my other post, spring loaded tangential drives. A threaded rod pushes against a plate. 

 

 

Advise for the amount of friction settings on the RA DEC lock/clutches and how it affects the slow motion knobs? Just acquired a Type 1 Telementor. Lovely optics and mount. Thanks. Mark

 You adjust the friction until it suits you. You can set it to just the right amount, so you can push the scope along manually, like a Dobsonian. 

 

 

Clear skies!

Thomas, Denmark

[Most2]

As per my other post, spring loaded tangential drives. A threaded rod pushes against a plate. 

 

 You adjust the friction until it suits you. You can set it to just the right amount, so you can push the scope along manually, like a Dobsonian. 

 

 

Clear skies!

Thomas, Denmark

Thank you Thomas for the description. Yes indeed it moves as easily as my other excellent, modern, alt az mounts. The quality is evident in the manufacture of the Zeiss mount. Classic scopes are fun. 

 

Take care.   Mark 

[Corcaroli78]

Just to re-bump this nice thread:

 

My Telementor has been my first choice for uncomplicated observations this summer, either solar or at dusk night for lunar and planetary. I still can not fully describe the joy it produces every time that i set it for observation, a classy, reliable and enjoyable instrument. For important events, it is my first choice.

 

 

 

The possibility to set the friction and use it as a dob is probably one of the reasons because i like to observe with it.

 

Carlos

 

[Astrojensen]

After almost eight years, this thread is still going. Fun! 

 

Despite owning many larger instruments, I still use my Zeiss C63/840 regularly. Mainly for solar observing, but also now and then for casual lunar observing, as well as some deep sky. 

 

 

I've found that the Masuyama 85 eyepieces play extremely nicely with the 63/840. The 32mm gives a riveting wide-field view. Exceptional contrast and brightness for such a small instrument. The stars are sharp almost to the edge, and the Double Cluster is a most stunning sight. The 20mm has an almost ideal balance between brightness and magnification for many smaller NGC objects. NGC 2158 near M35 pops right out as a small, dense glowing fuzz, easily visible. 

 

It's also surprisingly capable as a photographic instrument. Here's a ten-minute image of the Leo Triple, taken with my smartphone through a 40mm ES52 eyepiece:

 

The Leo Triplet (M65/M66/NGC3628), March 30th, 2025. Zeiss C63/840, 40mm ES52. OnePlus Nord CE3 Lite, Deep Sky Camera app. 20 x 30 seconds at 6400 ISO. Stacked in DSS; processed in Windows Pictures.

 

 

Clear skies!

Thomas, Denmark

[cavecollector]

What did you use to adapt it to 2"?

[Astrojensen]

What did you use to adapt it to 2"?

A 2" Baader diagonal. The following can be used: # 2456115; # 2456117; # 2456120. 

 

Use the following adapters (sorry for the Danish text):

 

 

The diagonal (# 2406210) shown in the drawing is no longer in production and must be replaced with one of the three mentioned above. I now use the 2" Baader/Zeiss prism diagonal, also no longer available, but replaced with the virtually identical 2" BBHS prism diagonal # 2456117. The prism diagonals eats about 20mm less back focus than the dielectric ones. 

 

It's not exactly a cheap way to adapt the Telementor/Telemator to 2" eyepieces, but it does work very well, and is completely reversible. You do need a 2" diagonal anyway, so I've found it the least complicated way to get 2" eyepieces on my Telemator.  

 

To give less vignetting with very large eyepieces, I have removed the rearmost baffle in the focuser tube in the OTA. I've also lined the inside of the focuser tube with black felt. 

 

 

Clear skies!

Thomas, Denmark

Edited by Astrojensen, 13 May 2025 - 02:34 PM.

[cavecollector]

Perfect, this is exactly the information I was looking for! Thomas, you're the best!

 

I have a bunch of Zeiss diagonals,  just needed help with the various Zeiss (and Baader) adapters. 

Edited by cavecollector, 13 May 2025 - 03:18 PM.

[Corcaroli78]

Perfect, this is exactly the information I was looking for! Thomas, you're the best!

 

I have a bunch of Zeiss diagonals,  just needed help with the various Zeiss (and Baader) adapters. 

There is another option that Thomas has proposed to me as well:

 

If you buy an adaptor ring (part # 2458110  Adapter M48a auf T-2i) it can be screwed in the 2 inch eyepiece filter thread and then directly to any T2 Baader diagonal (like the 1.25 Prism diagonal). It is not the most user friendly, but in this way, i can use my current 1,25" Baader diagonals.

 

Carlos

[Astrojensen]

There is another option that Thomas has proposed to me as well:

 

If you buy an adaptor ring (part # 2458110  Adapter M48a auf T-2i) it can be screwed in the 2 inch eyepiece filter thread and then directly to any T2 Baader diagonal (like the 1.25 Prism diagonal). It is not the most user friendly, but in this way, i can use my current 1,25" Baader diagonals.

 

Carlos

True. This solution works well for eyepieces with slightly smaller field stop than the full 2" barrel. It can be made more user friendly by putting a Baader Quick-Coupler between the eyepiece and the diagonal, and putting a Quick-Coupler ring on the 1.25" adapter used for normal 1.25" eyepieces. This way you can quickly change between low power 2" wide field and higher power 1.25" eyepieces.  

 

I've not updated the drawing to show the Quick-Coupler between the diagonal and eyepiece, but the basic configuration looks like this:

 

If you want to use 2" eyepieces on a Zeiss M44 diagonal, you can do the same, by using the Zeiss/T2 adapter between the diagonal and the M48/T2 adapter. 

 

I need to make new drawings.

 

 

Clear skies!

Thomas, Denmark