Jump to content


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Eyepiece Upgrade Help - Should I spend my money?

  • Please log in to reply
8 replies to this topic

#1 CChristakis


    Explorer 1

  • *****
  • topic starter
  • Posts: 84
  • Joined: 12 Sep 2016
  • Loc: Maryland

Posted 23 September 2020 - 10:28 AM

I probably don't need a new eyepiece but I was looking at possibly replacing or adding a new eyepiece to my collection for my 8" F6 Dob and 4" F6.5 Acro.

I am debating about either adding a 30mm APM UFF or replacing something in the 10mm to 12mm range (Possibly a Morpheus 12.5mm or ES82 11mm).   I mostly use my scopes at my house which is Bortle Sky 5 but I have a nearby train yard with lots of stray light.   Without my light pollution issues I would get the 30mm APM.  However, my concern is it will not get used as often because of the amount of extra stray light I have to deal with.

Here is what I currently have.

Celestron Omni Plossl - 32mm (Rarely Use.  On the chopping block to sell.)
ES68 - 24mm (Great eyepiece and often use it.)
APM HDC - 20mm  (Great eyepiece and often use it.   I tend to use this eyepiece more than my ES68 24mm because the sky is slightly darker in my light polluted sky.)
Celestron X-Cel LX 18mm (Rarely Use.  On the chopping block to sell.)
Celestron Duo 17mm (I actually like this eyepiece and use it often.  Mostly for lunar.)
ES82 - 14mm  (I use it often but its not as comfy as my other ES eyepieces.)
Celestron X-Cel LX 12mm  (I have been using this eyepiece less and less.)
Celestron Luminos 10mm  (I try using this eyepiece but I prefer using my ES82 8.8mm.)
ES82 - 8.8mm (Bought this eyepiece last year and enjoy using it.   Great eyepiece.)
Celestron X-Cel LX 7mm  (I still use this one but tend to use the ES82 8.8mm more.)




#2 sg6



  • *****
  • Posts: 9,018
  • Joined: 14 Feb 2010
  • Loc: Norfolk, UK.

Posted 23 September 2020 - 10:43 AM

You don't need a 30mm or anything in the 10-12mm range.

Don't spend your money.

Unless you want a 6mm.

  • CChristakis likes this

#3 havasman


    Voyager 1

  • *****
  • Posts: 11,591
  • Joined: 04 Aug 2013
  • Loc: Dallas, Texas

Posted 23 September 2020 - 10:44 AM

The 30mm likely wouldn't get much focuser time. Mine never gets used here in town because of the high level of light pollution. If you think you need something between the 14 and 8.8 then the 11 seems like a fit.

  • CChristakis likes this

#4 rowdy388



  • *****
  • Posts: 4,001
  • Joined: 09 Apr 2013
  • Loc: Saratoga County, NY

Posted 23 September 2020 - 11:14 AM

I really liked my 11mm ES82 and used it a lot but got tired of having to clean the smudges off it

after every use. The Morpheus 12.5 would probably be a treat to try. I have the 17.5 and 9 and 

love the immersive views. Since you like your 20 APM HDC the 13mm APM might also be worth


  • russell23 and CChristakis like this

#5 Echolight



  • -----
  • Posts: 1,076
  • Joined: 01 May 2020
  • Loc: Texas

Posted 23 September 2020 - 12:54 PM

I've been struggling over picking my next eyepiece.


The 20 Hyperwide should be here tomorrow.

But the APM 13 shows to have a shorter eye relief. And I'm all about comfort and ease of use.


11 Nagler and ES82 look to have even less eye relief.



So I'm thinking that the Morpheus 12.5 might be my only real option in the semi-premium class. Or the APM Hi-FW 12.5mm. But I like the 2 inch skirt on the Morpheus. And $60 cheaper.

There's also the XW10.


I think I'd rather be the guinea pig on the Meade 28mm PWA than get the 30UFF. Seems like a better fit behind the 20mm Hyperwide. Although it's 28 ounce weight is a bit offensive.

Edited by Echolight, 23 September 2020 - 12:58 PM.

  • CChristakis likes this

#6 macdonjh


    Fly Me to the Moon

  • *****
  • Posts: 6,016
  • Joined: 06 Mar 2006

Posted 23 September 2020 - 12:56 PM



Before you buy any other eye pieces, try to decide what you want to get out of your purchases.  Is there something you want from your current eye pieces you don't get?  Are they not sharp enough?  Do you wnat more (or less) eye relief?  How is the field of view?  


Some specific questions based on the information you provided:

  • Do you like the view through your ES82-14, but just wish it was more comfortable?  Perhaps a different 14mm, then?
  • Do you think you have too big a magnification gap between your 17mm and ES82-8.8?  Perhaps get a different 10mm- 12mm you like better and sell your current 10mm and 12mm.
  • Do you wish you had an eye piece with a focal length shorter than your ES82-8.8?


Of your eye pieces, you said you use these most often:  24mm  20mm  17mm  8.8mm which provide:

  • 8" f/6: 50x, 60x, 70x, 136x
  • 4" f/6.5: 28x, 33x, 39x, 75x

So considering magnification only: you have low magnification well covered.  I don't know how steady the sky is in Maryland, but I can use much higher magnification than 136x pretty often where I live.  I'd be looking for a 6mm and a 4-5mm focal length eye piece.  But that's just me.

Edited by macdonjh, 23 September 2020 - 12:58 PM.

  • CChristakis likes this

#7 CChristakis


    Explorer 1

  • *****
  • topic starter
  • Posts: 84
  • Joined: 12 Sep 2016
  • Loc: Maryland

Posted 23 September 2020 - 04:31 PM

I appreciate some of the feedback.

I think selling off what I don’t use and don’t like is my ultimate goal and replacing them with wider FOV and comfortable eye relief.

But I do like the idea of also adding something in the 5 to 6 range.

The challenges with this hobby is being content with what you have but often find myself wanting more.

#8 SeattleScott



  • *****
  • Posts: 8,968
  • Joined: 14 Oct 2011

Posted 23 September 2020 - 04:51 PM

The 20mm 100 probably has almost identical TFOV as the APM 30 UFF so it would be redundant unless you just preferred more eye relief or something.

Remember your 7mm is really 6.5. So a 4.5-5 would be the logical progression. Possibly the highly acclaimed Meade 5.5 and that could potentially replace the 6.5 with better AFOV.

17 to 8.8 is a sizable gap. I would want something between 11-13 in there. Sounds like your 12 and 14 aren’t really doing it for you so time to try something else. The 12.5 Morpheus or 12.5 APM Flat Wide come to mind, both having wide AFOV and long ER.


#9 sportsmed


    Vostok 1

  • *****
  • Posts: 134
  • Joined: 01 Aug 2012
  • Loc: Hot Springs, AR

Posted 23 September 2020 - 05:13 PM

I have a ES 82 11mm and love it, I use that and my ES 14mm all the time, great eyepieces. But I think you have alot covered, You could get a ES 82 6.7 if you want more FOV then the X-Cel 7mm. Clear skies!

  • CChristakis likes this

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Recent Topics

Also tagged with one or more of these keywords: eyepieces

Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics