banjaxed Posted October 27, 2019 Share Posted October 27, 2019 I have placed a wanted ad for a reflector OTA to practice my collimating skills and have been advised to steer clear of the Bird Jones type, but my problem is I don’t know what a Bird Jones reflector type is 🙄Could anyone please explain how to tell the difference, thank you. Link to comment Share on other sites More sharing options...
domstar Posted October 27, 2019 Share Posted October 27, 2019 If there are no takers on this one I'll have a go. If the focal length of the Newt is longer than the tube then it's a Bird Jones. There is a built in Barlow. This is just what I've learnt from the forum-no direct experience. Link to comment Share on other sites More sharing options...
joe aguiar Posted October 27, 2019 Share Posted October 27, 2019 Theres a long thread maybe it's on ph 2 maybe 3? Joejaguar Link to comment Share on other sites More sharing options...
Craney Posted October 27, 2019 Share Posted October 27, 2019 37 minutes ago, banjaxed said: I have placed a wanted ad for a reflector OTA to practice my collimating skills and have been advised to steer clear of the Bird Jones type, but my problem is I don’t know what a Bird Jones reflector type is 🙄Could anyone please explain how to tell the difference, thank you. Where abouts are you in the North West ??..... I do have an old battered C8N ( Celestron 8" Newtonian F5 ) that didn't fair well in the hands of a courier when it was delivered. I have always felt a bit embarassed about posting it on the 'For sales' as the tube has a dent and a few scratches., but it seemed to work OK for visual and might be what you need as a practice instrument. The mirror, cell , secondary + vanes are all fully functional. I was going to dismantle it and sell these bits as a package. If interested. Drop me a message. sean. Link to comment Share on other sites More sharing options...
banjaxed Posted October 27, 2019 Author Share Posted October 27, 2019 Thank you for your replies, much appreciated. Link to comment Share on other sites More sharing options...
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