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Eyepiece Guidance

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#1 jeffz

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Posted 18 September 2020 - 07:45 AM

All I  require some guidance on an eyepiece selection. I am a minimalist with three main eyepieces and a 2.5x Powermate.

My scopes are a SV80mm Access and a Meade 90mm ETX. I view planets, nebular, and general items. My requirements are that the eyepiece can accept a DioptRx.

I am looking for a lower power eyepiece 1.25" so it can be used with both of my telescopes. I am replacing with this purchase my now sold TV Nagler 17mm Type 4, which is a 2" eyepiece and gave me very acceptable views. I am looking at 4 eyepieces all of which should accept the DioptRx. The TFOV was calculated for the SV 80mm Access.

 

32mm    TV Plossl      TFOV 2.86

24mm    ES 68           TFOV 2.91

19mm    TV Panoptic TFOV 2.31

18.2mm TV Delite      TFOV 2.02

 

I am undecided but favoring the 24mm ES and the 19mm Panoptic. I have no experience with any of the eyepiece accept the TV 32mm which I have owned. 

 

Your knowledge of these eyepiece would be very helpful. There plusses and negatives, etc. Your help is appreciated. Thanks.



#2 Second Time Around

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Posted 18 September 2020 - 08:11 AM

I gather that the 24mm ES68's eye relief is overstated and will be insufficient with a Dioptrx to see the full field of view. The 24mm 65deg APM ultra flat field takes a Dioptrx and should show you a greater field of view in practice.
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#3 cst4

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Posted 18 September 2020 - 08:16 AM

I've used them all except the ES 24mm... I have a 24mm Panoptic instead. 

My favorite individual eyepiece out of those you list is probably the 18.2 Delite.  It's a great eyepiece... super sharp and very comfortable.  Nice long eye relief.

The 19 Pan is great too but the eye relief is a little tight.  I haven't touched my 19mm Pan since I got an 18.2mm Delite if that tells you anything.  

I just sold my TV 32mm plossl because it never got used.  Eye relief is actually a bit too long and it is slightly touchy on eye placement.  Plus it feels narrow once you get used to wide FOV EP's. 

I much prefer using my 24mm Pan as my max field piece.  If you don't have something along those lines in your kit then I recommend you go with that.  Shows the most sky in a 1.25" format.


Edited by cst4, 18 September 2020 - 08:18 AM.


#4 25585

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Posted 18 September 2020 - 02:50 PM

I gather that the 24mm ES68's eye relief is overstated and will be insufficient with a Dioptrx to see the full field of view. The 24mm 65deg APM ultra flat field takes a Dioptrx and should show you a greater field of view in practice.

24 APM UFF has just enough eye relief for wearing glasses. My 22mm Vixen LVWs have more effective eye relief, cups turned down, but they are sadly discontinued. However a Baader Hyperion 21mm is not bad and is also easy viewing.

 

Otherwise long eye relief can be found in 25mm Meade HD-60/Celestron Xcel LX, 26mm ES62 and Takahashi 28mm MC 60° Erfle. I own and use all the above 


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#5 SeattleScott

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Posted 18 September 2020 - 05:04 PM

Given you are also using a Mak, I would be inclined to go longer FL to get a brighter exit pupil. I use a discontinued 30mm Ultima for my ETX90. Something around 30mm wouldn’t be bad at all for the Access either. My Ultima was purchased used for $75. Of course you can buy the TV Plossl new.

Scott

#6 russell23

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Posted 18 September 2020 - 06:05 PM

The 18.2mm DeLite would be my choice if you are using a dioptrx.   The 19mm Pan only had 13mm of eye relief so it likely will vignette the field.  The Ethos field is vignetted with 15mm of eye relief. 

 

The 18.2mm DeLite is one of my most used eyepieces with my 72mm f/6 and 102mm f/7 APO's.



#7 jeffz

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Posted 20 September 2020 - 06:35 AM

Thanks for the great information.



#8 csrlice12

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Posted 20 September 2020 - 11:42 AM

Find a used 22 Panoptic...you will thank me later.




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