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Replacement secondary for xx12i

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#1 mak17

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Posted 28 April 2013 - 03:38 AM

Anyone know where I can get a new secondary? The Orion website says its a 70mm secondary.

#2 planet earth

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Posted 28 April 2013 - 04:00 AM

Agena Astro has the GSO 70mm, 12mm thick $70.00.
http://agenaastro.co...rror-70-mm.html
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#3 pstarr

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Posted 28 April 2013 - 08:50 AM

If your replacing a bad secondary. I wouldn't go with another supplier who has been hit miss on quality. Antares or Protostar are two who sell quality secondaries. web page
web page

#4 mak17

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Posted 28 April 2013 - 06:08 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?

#5 pstarr

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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

#6 FirstSight

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Posted 28 April 2013 - 08:15 PM

I have the 2.6" Protostar Quartz secondary in my 12XTi (which optically is identical to your XX12i). I don't notice any significant loss of field illumination using that size secondary.

#7 mak17

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Posted 28 April 2013 - 09:45 PM

What's the widest field eyepiece you're using and do you see a difference between the protostar and stock diagonals?

#8 cliff mygatt

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Posted 28 April 2013 - 09:47 PM

I have the 2.6 inch protostar in my Orion XT12i as well with no problems!

#9 cliff mygatt

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Posted 28 April 2013 - 09:48 PM

I use ethos EPs up to 21mm with no worries!

#10 FirstSight

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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.

#11 mak17

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Posted 29 April 2013 - 09:06 AM

Thanks guys.

#12 jrbarnett

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Posted 29 April 2013 - 11:09 PM

Out of curiosity, what's wrong with your current secondary?

Regards,

Jim

#13 mak17

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Posted 30 April 2013 - 04:41 PM

Nothing. I just want a premium secondary.

#14 mak17

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Posted 01 May 2013 - 06:05 PM

Did u guys have to buy a new secondary holder?

#15 FirstSight

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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.

#16 dan777

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Posted 01 May 2013 - 06:42 PM

Happy Birthday Chris.

#17 mak17

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Posted 01 May 2013 - 08:09 PM

Thanks Chris and happy birthday. I plan on buying the 1/18 wave Antares optics 2.6. Hopefully I can see a brighter image.

#18 mak17

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Posted 01 May 2013 - 08:11 PM

What could I ask for the stock secondary? 30?

#19 UmaDog

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Posted 02 May 2013 - 04:50 AM

By all means upgrade if you want, but if you're buying it to see a brighter image, then I wouldn't bother. Even if it's 10% brighter, you'd be hard-pressed to notice that without a simultaneous side-by-side comparison. Depending on what's on your scope, there might be other upgrades out there which provide greater bang for the buck.

#20 planet earth

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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.
Sam

#21 mak17

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Posted 02 May 2013 - 08:21 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.

#22 planet earth

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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.
Clear Skies
Sam

#23 mak17

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Posted 02 May 2013 - 10:14 AM

Good point.

#24 NewMoonTelescope

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Posted 02 May 2013 - 10:23 AM

I second Antares Optics out of Rochester. I use them almost exclusively and have yet to get an underperformer.

Darker skies,

Ryan

#25 mak17

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Posted 02 May 2013 - 12:28 PM

Ryan those scopes look amazing. Thanks for weighing in.






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