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Explore Scientific ES102ED on a Twilight II

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#1 divers

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Posted 12 January 2018 - 04:03 PM

Well....I did it.  Just bought a used ES102ED and a used Twilight II to be used for my grab and go for those nights I don't want to drag the big 7" Mak outside.  If I have the sole aim of the widest view with this scope what is a good eyepiece to buy?  

 

Thanks!

 

 

Still looking for a used TMB92 f/5.5 if I ever get lucky :) 


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#2 HAVACOW

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Posted 12 January 2018 - 06:10 PM

For a F7 ratio, these eyepieces would be compatible:

 

1)  William Swan 40mm $118 20 oz.  72 degree.  No head movement needed to see the full field.  By far, the widest field of the three, but with some softness at the edges.  A good substitution for a viewfinder.

2)  Nagler 31mm 82 degree $650 35 oz.  

3)  ES 25mm 100 degree $799 41 oz.  About the same field as the Nagler, but with more desirable smaller exit pupil for improved contrast.  Very hefty weight and price.

4)  Meade MWA 21mm 100 (88 actual?) degree $199 27.5 oz. The smallest field, but higher contrast, reasonable weight,

and a great value!

 

Bill


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#3 divers

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Posted 12 January 2018 - 08:22 PM

Thanks...going to see if I can find a used Meade.



#4 jring

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Posted 13 January 2018 - 05:40 AM

Hi,

 

I'd also consider the 40mm ES 68 ($309). This one will give roughly the same field as the Williams SWAN but it will be pinpoint sharp to the edge. Heavy though.

 

This would give you a 3.8 deg field on the ED102.

 

I have the even heavier Maxvision variant which is optically the same but quite a bit cheaper at 125€ and not waterproof... great views in my ED80/600 but works also quite nicely in faster instruments.

 

https://www.bresser....kular-40mm.html

 

Joachim


Edited by jring, 13 January 2018 - 06:03 AM.

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#5 divers

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Posted 13 January 2018 - 08:01 AM

Looking at a ES 30mm 82 at the moment.  Two of them in the for sale section.



#6 jring

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Posted 13 January 2018 - 10:38 AM

Looking at a ES 30mm 82 at the moment.  Two of them in the for sale section.

 

That is also a nice one... the Terminagler clone is good value.

 

Joachim



#7 SeattleScott

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Posted 13 January 2018 - 11:30 AM

20-25mm 100 deg eyepieces are made for fast Dobs, not F7 scopes. I really appreciated the extra pop in faint fuzzies going from 24mm to 38mm eyepiece. Granted that was an F9 so translating to an F7 would mean closer to 30mm. If you plan to use a 2" OIII to view the Veil Nebula then a 40mm would be better. Maybe split the difference and get a 34mm 68 deg? Small enough exit pupil for suburban observing, large enough exit pupil for neb filter, considerably cheaper and lighter than the 30mm UWA or some of the 40mm SWA options. Another possibility would be the Baader 36mm Hyperions for a wider FOV. Some complain that they are getting close to higher end brands in terms of price but don't perform well in fast scopes, but I would think F7 would be fine.

Scott

#8 divers

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Posted 13 January 2018 - 12:27 PM

Just bought a used ES 30mm 82.
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