ICEINSPACE
Moon Phase
CURRENT MOON
Full Moon 99.7%
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17-07-2019, 01:08 PM
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Deprived of starlight
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Join Date: Nov 2006
Location: Sydney
Posts: 3,774
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Anyone collimated a Tele Vue scope?
My recently acquired Pronto appears to be out of collimation, showing coma in star images at 60x. I contacted Bintel and Astronomy Alive and they both said the scope would need to be sent back to Tele Vue for re-collimation. However, the cost of doing this would be more than the scope is worth.
I've seen a handful of threads on CN suggesting that DIY collimation is possible although way beyond my own (non-existent) skills. So I thought I'd see if anyone here has ever done this successfully with a TV scope and might be willing to have a go at this one.
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17-07-2019, 01:19 PM
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Registered User
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Join Date: Feb 2009
Location: Sydney
Posts: 1,217
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17-07-2019, 01:25 PM
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Deprived of starlight
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Join Date: Nov 2006
Location: Sydney
Posts: 3,774
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Quote:
Originally Posted by Profiler
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Thanks. I've left a message. I do note, however, that Tele Vue is conspicuously absent from the list of supported brands on their website!
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17-07-2019, 01:45 PM
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Registered User
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Join Date: Jun 2006
Location: Camberwell, Vic
Posts: 319
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Morton, I think it’s Roger Davies most recently from Bintel in Melbourne, unfortunately now closed. He’s really knowledgeable and should give you a straight answer, Fox
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17-07-2019, 07:21 PM
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Registered User
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Join Date: Oct 2013
Location: Dunners Nu Zulland
Posts: 1,665
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Morton, have you seen this thread?
https://stargazerslounge.com/topic/3...e-vue-prontos/
I'd probably just ring TV. Good old phone is still a highly effective way to get answers quickly (unless it's a govt dept or something).
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17-07-2019, 07:28 PM
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Feel free to edit my imag
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Join Date: Jan 2019
Location: Llandysul, WALES, UK
Posts: 1,381
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Is this true
" Whereas the TV76 has a 76mm full APO objective, the Pronto is a 70mm achromat. Read that again. No, it’s not a “semi-APO”, it’s an achromat! From what I have read (by a certain person who almost certainly knows), TeleVue used a cheap ED glass in the objective which has little or no effect on correction for chromatic aberration, but did allow them to use the letters “ED” when marketing it!"
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17-07-2019, 07:29 PM
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Feel free to edit my imag
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Join Date: Jan 2019
Location: Llandysul, WALES, UK
Posts: 1,381
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I would be interested in a thread about collimating refractors or web site please
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17-07-2019, 08:33 PM
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Registered User
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Join Date: Mar 2018
Location: Sydney, NSW
Posts: 83
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Roger is brilliant. I found a visit to his workshop and a nice long chat with him to be a privilege and that alone was well worth the drive to padstow. He’s got spare parts and bits of every kind too.
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18-07-2019, 12:24 AM
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Deprived of starlight
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Join Date: Nov 2006
Location: Sydney
Posts: 3,774
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Roger replied and isn't put off by tackling a Tele Vue scope so I may pay him a visit.
I also discovered tonight that the retaining ring on the front of the lens was a bit loose. Tightening this by hand (and breaking several nails in the process) has made a dramatic improvement and the coma seems to be gone. It's not quite perfect but then the seeing is awful so it's hard to tell. Once I get a better night I'll do a proper star test but things are looking up.
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18-07-2019, 09:13 AM
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Registered User
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Join Date: Feb 2009
Location: Sydney
Posts: 1,217
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Roger is probably the best person going in Sydney so you have certaionly made the right choice when you consider/balance up the variables of cost vs value of the scope etc
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18-07-2019, 07:29 PM
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Deprived of starlight
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Join Date: Nov 2006
Location: Sydney
Posts: 3,774
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In better seeing tonight things are looking pretty good! Might take it to Roger for inspection anyway but I'm getting nice tight stars and good contrast. Just need to find a way to balance it better.
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18-07-2019, 09:36 PM
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pro lumen
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Join Date: Jun 2006
Location: ballina
Posts: 3,264
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I took my new one out for a spin last night , pretty poor seeing at the moment i believe, and a bit of smoke around and was happy enough at around 90 x , I dont expect it to be more than a nice compact widefield .
Though on the moon I found CA to really be minimal like its there but nothing like a any of the short achros I've looked through .
Over 2k when new in aus .
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19-07-2019, 11:17 AM
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Deprived of starlight
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Join Date: Nov 2006
Location: Sydney
Posts: 3,774
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Yes, the CA is well controlled. On Jupiter it's more evident but not objectionable, and this is hardly a planetary scope anyway.
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