old 8inch celestron
Posted 25 June 2020 - 08:25 PM
Posted 25 June 2020 - 08:53 PM
- Defenderslideguitar likes this
Posted 25 June 2020 - 09:19 PM
Posted 25 June 2020 - 09:25 PM
Posted 25 June 2020 - 09:27 PM
Tubes were indeed orange in the 1970s. Could it have been painted? Or a later tube mounted on an older base?
- Defenderslideguitar likes this
Posted 25 June 2020 - 09:33 PM
Posted 25 June 2020 - 09:50 PM
It was made in the first quarter of 1973. At least the base/fork assembly was. It is a sand cast, but can't tell if a tricolor or not with the dark backlit picture.
Pictures of the tube and mount will help. Also a picture of the OTA front showing the corrector and secondary button.
- markb likes this
Posted 26 June 2020 - 05:32 AM
They changed to black around late 1983. Could be a later made black OTA on a older set of forks. OR THE TUBE WAS PAINTED.
Edited by CHASLX200, 26 June 2020 - 05:32 AM.
Posted 26 June 2020 - 06:25 AM
Posted 26 June 2020 - 07:08 AM
There's a fairly good likelihood you have a solid scope likely to be be a good performer.
I'm not sure why it's age is still being discussed, the label on the base tells it all, documented here on CN. 1973, it possibly sat at a dealer before being sold. Sand-cast cells indicating it may have been repainted, which you have now confirmed.
Time to do some research, and some hunting.
The base does have a synchronus drive motor running from house current, 110 in the US. With luck, it will still work.
There shouldn't have been any loose wires underneath, if so, post clear well lit photos like the ones of your label to get a little help.
You should find the appropriate power cord, do a search here on Cloudynights for the appropriate part number to search for. There have been posts in the last year, and I believe they're still available on eBay at the very least. It's an unusual cord but was used in various equipment through the 60s.
You also have to start doing some research, there are books, websites, and forums here on cloudy nights. Beginners forum, Cats and Casses (you have a Schmidt CASSegrain, SCT), and even the Vintage forum.
You might also have purchased the other two things you need, a tripod and wedge. Tripod is self-explanatory, the wedge is essentially pieces of cast metal that make an angle of approximately 45 degrees that can be adjusted for your position on the Earth, equal to the latitude.
Once bolted to the wedge and the wedge is bolted to the tripod, the internal motors should turn the telescope to track with the sky. More advanced users may want to vary that speed, but you should ignore that until you learn more. back when this telescope was made very few people bought the expensive electronics to allow that. Virtually everyone just plugged it in and used it.
If you don't have one, you can research what you need to buy used. Lots of older tripods and wedges are floating around as people upgraded, or shifted to a different type of Mount to hold the telescope tube.
You will need something to aim the telescope, a finder, a used mini telescope finder can be inexpensively bought in the classifieds.
Don't go crazy with eyepieces yet, a 12mm and 26mm plossl, even inexpensive ones from places like our host, Astronomics, link at the top of the page will be fine to get you started enjoying the telescope. You can call them for some advice on the eyepieces. which numbers are proximate and I chose them based on what most people tend to use on an everyday basis.
Edited by markb, 26 June 2020 - 07:14 AM.
- danny7481 likes this
Posted 26 June 2020 - 07:12 AM
Posted 26 June 2020 - 07:56 AM
Right, it's an equatorial mount with a clock drive. It turns at solar rate. And does nothing else. There are mechanical dec and RA slow motions; no electrical slow motions. Here is the instruction manual: http://www.company7....8manual1971.pdf
- MJB87 likes this
Posted 26 June 2020 - 09:01 AM
- Michael Covington likes this