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Celestron Evo 8 viewing planets and dsos

cassegrain Celestron eyepieces observing SCT
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#1 deriksss

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Posted 15 August 2019 - 07:40 PM

what is the best setup for celestron evo 8 sct for viewing planets and dso. im thinking about:

  • getting a 2 " diagonal, using 2" 32mm ep for dso and getting an 1.25 adapter and use 10mm ep for planets.
  • getting a 2 " diagonal, using 2" 32mm ep for dso and getting a 2" barlow and use 26mm ep for planets.
  • getting a 6.3 reducer with 32mm ep for dso and a barlow with 10mm ep for planets all on 1.25 setup

are any of these options sufficient for viewing plants and dsos without having to remove a reducer or anything? any other suggestions?



#2 Nippon

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Posted 15 August 2019 - 09:21 PM

Personally I would stick with a 1.25" diagonal and for starters get decent Plossl eyepieces of 32mm, 15mm and a 9 or 10mm. The f/6.3 reducer/corrector is a nice and useful way to widen the true field and correct for the inherent off axis aberrations of an 8"SCT. Better in my opinion than using a 2" diagonal and wide apparent field of view long focal length eyepieces. An 8" SCT is just not a wide field instrument but frames most of the best DSOs with a set of the above listed eyepieces. The 9 or 10mm will, on most nights, provide as much magnification as the seeing will allow for planets and the Moon.


Edited by Nippon, 15 August 2019 - 09:22 PM.


#3 SeattleScott

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Posted 15 August 2019 - 10:50 PM

I consider option #1 the most ideal because you do lose something when viewing Moon and planets with the reducer, and it is a bit of a hassle to take it on and off. With 2” you can avoid hassle of a reducer altogether. It is the more expensive route however, and I would go 38mm instead of 32mm.

I generally wouldn’t get a barlow for an SCT because they have so much focal length already. Of course I have other scopes so I have a wide range of eyepieces to work with all my scopes. Just starting out with a SCT I could see how a barlow could be useful.

Scott


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