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Thread: Refractor or Catadioptric?

  1. #41
    fallout2077's Avatar
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    Default Re: Refractor or Catadioptric?



    One question I've been asking myself concerns the 6" Advanced VX Refractor, and whether or not you folks could tell by looking at the images if the diagonal fits the 2" eyepieces or only the 1.25" eyepieces. My judgment leans toward the latter, and you would have to remove the diagonal to fit the 2" EPs into the focuser. Is my perception correct, or do my eyes deceive me?

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    Default

    Most 2" diagonals come with a 2" to 1.25" adapter (at the eyepiece end).


    If it's a 2" focuser, then the diagonal will almost certainly be 2" as well.

    That's one of the nice things with refractors - since there's no secondary mirror, you can still use 2" eyepieces with many (but not all) of the smaller ones.

    Both my 80mm and 60mm refractors can use 2" eyepieces - though putting a big 82 degree eyepiece in the 60mm is a bit like the tail wagging the dog

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    Default Re: Refractor or Catadioptric?

    Well then, that's one more point for the refractors! Another big selling-point for me in regards to refractors is their simplicity in contrast with reflectors and their need to be collimated to achieve the perfect result. Of course, with the cost of the 6" refractor, I can buy an 8" reflector. Darn telescopes, it all seems to be a lesson in compromise! What would you recommend, folks: a 6" chromatic refractor or an 8" reflector?

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    Default Re: Refractor or Catadioptric?

    My Explore Scientific APO came with a dielectric 2" diagonal but my 120mm Celestron XLT refractor came with a 1.25" diagonal even though it has a 2" focuser. The XLT uses a reducer in the focuser. I wouldn't be too surprised if the 6" Celestron also has a reducer in the focuser and then a 1.25" diagonal. I certainly wouldn't let that stop ME though. You can get a 2" dielectric diagonal for a little over $100.
    Dennis. ~ 45 years of astronomy and not giving up anytime soon!
    Explore Scientific 16" truss DOB; Explore Scientific 152mm carbon fiber triplet w/3" Feathertouch; ES 80mm triplet; Apertura 10" DOB w/tweeker's; Celestron 9.25" Edge; Celestron Edge 14" with Feathertouch; Celestron CGE Pro mount; Celestron AVX mount with ADM "D" saddle; QHY Polemaster; and my first, a Sears 60mm F/11 doublet; ZWO ASI294MC-Cool; ES field flattener; ES 3" flattener/FR; Televue 0.8 field flattener/FR; lots of TV and ES eyepieces; Lunt solar wedge with Celestron XLT 102

  5. #45
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    Default Re: Refractor or Catadioptric?

    Equatorial
    Orion Atlas Pro, Vixen VMC260L 10 inch, Vixen Atlux, Nexstar 8SE, Advanced VX GEM, Vixen ED81S, Vixen Skypod Mount, iOptron ZEQ25, Televue Ethos eyepieces, Celestron Eyepieces - StarSense, Skysync, Orion Starshoot Autoguider, ASI120MM, Atik 383L+ Color CCD, Nikon D810a, Nikon 810a, Nikon D800e modified (Spencers), Nikon F/4 200-400, Nikon F/2.8 70x200. Solar filter for 8 inch, 2 Meade Piosai illuminated reticle eyepiece, 1.25.

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    Default

    What are you referring to, Nikon Shooter?

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    Default Re: Refractor or Catadioptric?

    Quote Originally Posted by fallout2077 View Post
    What are you referring to, Nikon Shooter?
    Apologies - for the disconnect. I thought I had added the quote with answer (I was putting my two cents in for purchasing a equatorial mount if Astro Photography is going to play a major part of your "looking up" experiences.

    My son gave me a Vixen ED81 refractor and lots of gear with a Vixen goto mount (Alt Az) The scope was too much for the mount so the goto and tracking was so so. I then bought the Nexstar 8SE and soon realized I needed a EQ mount for long exposures (AP) . I added the AVX mount which was a great choice for me.
    Orion Atlas Pro, Vixen VMC260L 10 inch, Vixen Atlux, Nexstar 8SE, Advanced VX GEM, Vixen ED81S, Vixen Skypod Mount, iOptron ZEQ25, Televue Ethos eyepieces, Celestron Eyepieces - StarSense, Skysync, Orion Starshoot Autoguider, ASI120MM, Atik 383L+ Color CCD, Nikon D810a, Nikon 810a, Nikon D800e modified (Spencers), Nikon F/4 200-400, Nikon F/2.8 70x200. Solar filter for 8 inch, 2 Meade Piosai illuminated reticle eyepiece, 1.25.

 

 
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