Replacement secondary for xx12i
Posted 28 April 2013 - 03:38 AM
Posted 28 April 2013 - 06:08 PM
Posted 28 April 2013 - 06:42 PM
I want a high quality secondary but the 2.6 inch Antares and protostar are a bit smaller then 70mm. Will this cause a loss of illuminated field?
70mm is 2.76". It's hard to answer your question without knowing the design specifics of your scope. Do some measurements and lay them out here The 70mm could turn out to be oversized or undersized. Unless you plan on doing photography, shoot for a fully illuminated field of 1/2". Here is another calculator
Posted 28 April 2013 - 08:15 PM
Posted 28 April 2013 - 09:45 PM
Posted 28 April 2013 - 09:47 PM
Posted 29 April 2013 - 05:08 AM
I use ethos EPs up to 21mm with no worries!
21 Ethos and 31T5 Nagler, with no worries with either.
Posted 29 April 2013 - 11:09 PM
Posted 01 May 2013 - 06:36 PM
Did u guys have to buy a new secondary holder?
No, it's not necessary to replace your secondary holder in order to replace the secondary on any of the Orion XT line of reflectors. When I had an XT8, I replaced the stock secondary with an Antares tenth-wave secondary. With my 12XTi, I electively replaced *both* the secondary mirror *and* the entire spider/secondary assembly with Protostar models, but I could have instead just replaced the secondary mirror and used the stock Orion secondary holder to mount it on.
Posted 01 May 2013 - 08:09 PM
Posted 02 May 2013 - 04:50 AM
Posted 02 May 2013 - 05:44 AM
What could I ask for the stock secondary? 30?
I wouldn't sell it until you have the new secondary installed.
I paid $20.00 plus shipping for a used GSO 2.75" with the holder.
Posted 02 May 2013 - 08:21 AM
Posted 02 May 2013 - 09:45 AM
I've compared standard diagonals in refractors to high end diagonals and to my eyes the difference is obvious. Hoping this will be just as obvious. Subtle but clearly better. Well if there's no resale value I won't bother w the hassle of taking pics and making an ad then boxing it up going to post office. Keep it as a backup just in case.
If there is no one in your area to test your oem secondary fairly cheap, then replacing it (may) provide better images.(which I hope it does).
What are the chances? 50/50, so not so bad of odds.
Posted 02 May 2013 - 10:23 AM