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Old 11-07-2018, 06:15 AM
Malcolm
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Location: Lismore NSW Australia
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66mm Secondary?

Hi, I'm looking for a 66mm secondary. Out of a 10" AOS telescope. I did send both the primary and the secondary to Palmway Optical for re-coating but the secondary has come back in much the same cloudy condition so maybe it wasn't possible to re-coat it. It must be an odd size and I don't really want to have to replace the holder and possibly the spider as well.

It might be possible to carefully remove the holder flange and have a slightly larger flange 3D printed and glued into place as the holder looks like some sort of plastic material. That way I could maybe use a slightly smaller sized secondary. Thoughts on this or where I could get the correct size without having to take out a second mortgage? T.I.A.
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Old 11-07-2018, 11:12 AM
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billdan (Bill)
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You can get a 68mm secondary with holder ready to install from Teleskop Express in Europe. The price shouldn't break the bank, 83Euro.

https://www.teleskop-express.de/shop...tallation.html

Cheers
Bill
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Old 11-07-2018, 11:46 AM
astro744
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66mm is 2.6". This is a standard imperial size and is readily available from any U.S. source. What type of secondary holder do you have? Is it a proper holder or is it simply glued?

Try http://www.telescopes-astronomy.com....ccessories.htm

The 2.6" is not shown but could probably be ordered or he may have one.
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Old 11-07-2018, 07:26 PM
Malcolm
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Good one. T&A have a 65mm. Perfect. :-)
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