Milling tolerances for Jaegers objective cell
Posted 09 February 2013 - 08:29 PM
Thought you might like these pictures of my cell. It's very simple. And I didn't have to single point any threads..
Posted 10 February 2013 - 04:37 PM
Mine too has the collar that slips over and bolts onto the tube, in my case a 76mm Unitron tube. Mine will have a little interior rim the same thickness as the Unitron tube wall where it will sit square and below that there will be 5 holes drilled to secure the cell to the tube. This cuts the aperture of the lens down from 83 to 78 mm. Above this the cell widens to accommodate the wider objective lens. Then the top of the cell will be threaded for the Unitron thread on dew shield. The entire cell assembly will stand 55 mm but 10 mm will be obscured by the dew she's shield when attached.
I built a cradle for the OTA last week which has two opposing Vixen dovetail bars 8 inches long, so the scope can be mounted on my Vixen StarGuy or my CG4 or my Unistar Deluxe. The bars are also drilled and tapped with 1/4 20 holes so I can also put the scope on my Vintage Professional Jr. Panhead 16mm motion picture tripod.
When this project is finished I will begin planning my Jaegers 4 inch F15.
Posted 11 February 2013 - 07:16 AM
Posted 11 February 2013 - 10:09 AM
I did. A good friend told that basically, when a good deal comes along, you've got to strike while the iron is hot. Not in those exact words but you get his meaning. It was way to good of a deal to pass up so I did just that. I haven't got it yet but should have it in a week or so. Its a Telementor T1 which was exactly the model I wanted, the one with the helical focusor, and its on a beautiful T2 mount, the one with all the pretty blue and red. I am very excited. I will post pictures when I receive it.
Posted 11 February 2013 - 11:21 AM
Posted 11 February 2013 - 01:04 PM
Posted 11 February 2013 - 03:52 PM
Posted 11 February 2013 - 04:39 PM
Posted 12 February 2013 - 04:39 AM
The Telementor and T-mount is a uniquely innovative and well crafted example of astro engineering, and I'm sure you'll fall in love with that baby when you hold it in your arms...
Posted 12 February 2013 - 05:08 AM
The T-mount is almost without equal. The setting circles are 4.5" in diameter and highly accurate. You can use them to polar align in daylight with enough accuracy to use them to dial in stars and planets in daytime. I've used my Telemator to split Castor in the early afternoon.
Posted 12 February 2013 - 09:06 AM
Posted 12 February 2013 - 02:44 PM
Very few 60mm's can take a binoviewer+diagonal+adapters+2x25mm LER Zeiss eyepieces. Or a 30mm ES82 2" eyepiece and 2" Baader diagonal.
The only negative I can say about it is that it's a little too coarse, but other than that, it works like a dream. Here Zeiss was *really* thinking outside the box and came up with something truly brilliant and elegant. An engineering masterpiece.
Posted 12 February 2013 - 03:45 PM
Posted 12 February 2013 - 03:53 PM
The only negative I can say about it is that it's a little too coarse, but other than that, it works like a dream.
I would add also another slight negative of the internal focusing mechanism. Due to double tube, the OTA is quite heavy (definitely, it feels heavier than for example similarly sized ED100). But it is more than paid back by the option of hanging anything on the eyepiece side without worrying about sliding focuser.
Posted 12 February 2013 - 04:26 PM
Given the huge advantage of not having to deal with any focuser issues whatsoever when using heavy accesories, it's a bit of a mystery to me why not more manufacturers have used this design on their 50mm - 70mm scopes. An 80mm is big enough to support a beefy 2" focuser, but on the smaller scopes it might make more sense to make a lightweight inner focuser for the comparatively lightweight objective.
It certainly made sense to Zeiss.
Posted 13 February 2013 - 04:38 AM
Posted 13 February 2013 - 08:13 AM
Posted 26 February 2013 - 01:36 PM
Posted 26 February 2013 - 01:40 PM
Posted 26 February 2013 - 01:42 PM
Posted 26 February 2013 - 01:47 PM
Posted 26 February 2013 - 01:50 PM