Vintage Sears Tower or Discoverer Telescopes
Posted 01 August 2005 - 01:51 PM
Posted 01 August 2005 - 04:11 PM
Posted 01 August 2005 - 04:14 PM
Posted 01 August 2005 - 05:18 PM
Posted 01 August 2005 - 09:29 PM
...The image shows the hibrid diagonal that I use with it to adapt standard 1.25" eyepieces...
Curious; i have been hunting about for one of these, yours looks like a 90 degree mirror version, all i have found for sale is 45 degree prismatic ones. Where did you get yours?
Posted 01 August 2005 - 10:13 PM
It works fine though. I also use it for my 76mm.
Posted 02 August 2005 - 03:44 PM
Posted 02 August 2005 - 04:17 PM
Posted 02 August 2005 - 11:21 PM
Posted 03 August 2005 - 10:25 PM
Thank you very much for posting your manual. The 6334 is basically the same as my 2535. The colors are the same. The only differences are the tripod legs (2535 are wood) and the finder plus maybe some details of the equatorial mount. The manual will serve me well. Mine was lost when the telescope spent some years in my friends hand. Again thank you. I will try to get a good image of my 76mm to post here ASAP.
Posted 04 August 2005 - 08:13 AM
Posted 04 August 2005 - 07:17 PM
I have one anecdote that is interesting. After checking out a 76mm Sears in ebay I noticed that someone wrote the seller to indicate that this particular telescope of that model was from a lot that Sears bought from Unitron. According to that comment Unitron was getting rid of that model and Sears bought the remaining stock. I wonder if you have heard about this.\
Another thing is that someone must have adapted a more modern motor drive to this mount. I wonder if those small motors sold by Orion would work.
When I first got my 76mm I did use the sun filter many times ignorant of the dangers involved. I was lucky.
As soon as my son gets my digital camera back here I will take the images.
Posted 05 August 2005 - 08:22 AM
Posted 05 August 2005 - 08:58 AM
In fact Unitron is just the name of the U.S. company that bought the component parts for their scopes from a few manufacturers in Japan and had them either fully assembled or partially assembled in Japan and then shipped to the U.S. for sale. Unitron type scopes designed for sale in Europe and other parts of the world were labeled Polarex. Polarex being a separate company from Unitron as far as we have been able to tell.
Unitron telescopes first became available in the early 1950's thru the United Scientific Company operating out of Boston, Mass. The scopes rapidly evolved thru the 50's so that by the early 60's the established scopes remained essentially unchanged until they died out in the late 90's due to the fact that their prices by that time were outstripping the inflation rate, amateur astronomers were going to shorter, faster and cheaper telescopes, and the Japanese suppliers of many of the components were moving their businesses away from small and moderate sized telescopes to other ventures.
The 76 mm Sears equatorial refractor as pictured in the post above this one is the scope that brought me back to astronomy in 1978. I bought it used for about $175.00 complete and in perfect condition. It had fantastically good optics with the ability to split the Double-Double with a 28.7 mm RKE eyepiece (42x), a feat I have never duplicated with another telescope. I have also owned numerous Unitrons including the #152 (4" eq.), #145 (3" photo-equatorial), #142 (3" equatorial), #128 (2.4" equatorial) and the #114 (2.4" alt-azimuth). They were all great, well-built scopes with tube assemblies very different from the Sears refractors in terms of component parts and tube diameter (Unitron 2.4" refractors have a larger tube diameter than typical 2.4" refractors) and with a mount that is totally dis-similar to the Sears equatorial mount that is pictured above.
Having said this, I will say again that none of the Unitron scopes as good as they were could beat that Sears 3" in respect to splitting double stars inch per inch. The 3" Sears with it's somewhat unusual mount as pictured and available for just a few years from the late 60's to the early 70's was a great scope. (It was listed for $129.00 on sale in the 1973 Sears catalog.) Sears 3" scopes after the early 70's had an identical mount commonly seen with Tasco, Meade and many other refractors. The 2.4" Sears with the same light blue-gray-green tube assembly and darker blue trim always had the equatorial mount commonly seen with the Tasco and Meade scopes with the black wrinkle finish. While ok, the 2.4" Sears was no different from many other 2.4" scopes available from a variety of sources. I have had a total of 3 of them, bought used on eBAY. I gave one away and sold the other 2 for very reasonable prices.
Hope this info helps,
Barry Simon, Founder and Moderator
UnitronTelescopes Yahoo Group
Posted 05 August 2005 - 09:54 AM
Posted 05 August 2005 - 09:33 PM
For those of you who have the 76mm with wood tripod legs that end in thats pointed metal cap, you can get a new rubber end cap for the metal cap at an auto parts store. I bought some rubber caps that are used to plud vacuum lines and although they are a tight fit, they do the job.
76mm f/16 Sears (1966)
60mm f/11 Sears (1965)
Criterion RV6 (1970)
ETX 90EC (2002)
Sky View Pro 120mm f/8 (2003)
Posted 12 August 2005 - 08:53 PM
Posted 12 August 2005 - 10:01 PM
Posted 19 August 2005 - 10:40 PM
Posted 20 August 2005 - 09:30 PM
Posted 21 August 2005 - 07:59 AM
It said, "Sears" (and what is in my original post).
Does it say Tower, Scope or Discoverer in the focuser label?
Posted 21 August 2005 - 08:09 AM
ACHROMATIC COATED LENS
tubes on scope and finder are white. most fittings and dewshield are black. Black metal tripod tube legs, no light on tray. Solar projection screen has 2 pieces, the white surface, and a black aperture (black metal piece with hole in it). Solar projection holding rod attaches to tube, not draw tube. apparently camw with 6mm and 22mm eyepieces.
Posted 21 August 2005 - 09:30 AM