Nearly forty years (since Nov 1973) I have a Polarex spotting scope which I sometimes still use because of its ultimate grab&go capability.
I modded it years ago to replace the crappy turret + crappy Huygens eyepieces by a 1.25" diagonal which fits 'normal' eyepieces. Using a 13mm Nagler (38x) makes it a good 80mm deep sky viewer (but brighter stars show the spikes). Of course not as good as my Genesis.
But going beyond 50x power nasty spikes appear around bright objects and planetary observing is useless because of the spikes which destroy any contast.
Now I pointed thes scope to Arcturus and moved the focuser and filmed it, see here
http://pix.northsouthsky.com/polarex-80-spikes.gif the result.
The objective is mounted with three metal pins :
http://pix.northsouthsky.com/polarex-80-objective.jpg
which might cause the spikes. I put some black felt over the metal pins with no avail.
Any ideas on this ?
BTW I consider retrofitting this scope with a new objective :
http://www.teleskop-express.de/shop/...r-Fassung.html
but this costs me $440 and an aluminum adapter ring of M84x1 (thread on telescope) to M89x1 (thread on new TS objective) of about 5cm long to retain the same backfocus to be lathed.
Then this old one is refurbished to an APO.
Worthwile ?
