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ES 82˚ 6.7 vs Meade UWA 6.7 or ES 82˚ 4.7

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10 replies to this topic

#1 surfindogg

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Posted 07 February 2017 - 11:34 AM

Continuing my eyepiece rehash for the Takahashi FS-60CB/Q .......

 

I have the Meade at the moment and wonder if I would see any benefit from swapping to the ES 82˚ 6.7. Has anyone used them both and is there anything that recommends one over the other. I like the small size of the Meade but I do like the two ES 68˚s I have [16 and 24].

 

Would I be better off with the ES 82˚ 4.7 for the wider field at higher magnification?


Edited by surfindogg, 07 February 2017 - 11:35 AM.


#2 russell23

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Posted 07 February 2017 - 11:39 AM

You would be better off with the Meade 5.5mm UWA.  It is the best of these lines.


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#3 dufay

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Posted 07 February 2017 - 11:58 AM

You do not mention if it is the later 5000 or the earlier 4000 UWA you are referring to, but your mentioning of small size indicates that it is the older 4000 UWAs(?). I have the current ES 4.7mm and 6.7mm as well as the old Japan made Meade 4000 UWA in in the same focal lengths.

 

I have used them head to head just a few times and plan to do a more thorough comparison with a write-up later. My initial impressions are that they are optically on the same level.  The big advantage of the 4000s over the 5000s and ESs is the tiny sizes of the 4.7mm and 6.7mm focal lengths. The big advantage of the ESs is the ergonomics. With the 4000s you need to put your eye straight up to the eye lens and even then you have to move your head and "peak around the corner" in order to take the whole field. The ESs, in contrast, provides a big easy panoramic view. I know some people complain about the eye relief of the ES82s (and the Nagler T6) with reference to the big easy panoramic of view of a XW, Delos, Morpehus etc. It is kind of the same feeling switching from the 4000s to the current ESs.


Edited by dufay, 07 February 2017 - 12:00 PM.


#4 surfindogg

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Posted 07 February 2017 - 12:06 PM

@dufay - thanks. It is the 4000.

 

My wonder was if the ES are better with more modern coatings. I like the Meade but find it quite dark with the FS-60 in Q mode.



#5 dufay

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Posted 07 February 2017 - 12:19 PM

I compared them on lunar and planetary targets where coating differences are of less importance. I'm sure the ESs have improved coating over the Meades and it might be a consideration depending on you observing preferences. The 6.7mm gives a 0.67mm exit pupil in your FS-60Q, which many will find quite dark. I would not expect modern coatings to provide a dramatically brighter image.


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#6 Jon Isaacs

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Posted 07 February 2017 - 12:20 PM

@dufay - thanks. It is the 4000.

 

My wonder was if the ES are better with more modern coatings. I like the Meade but find it quite dark with the FS-60 in Q mode.

What's the focal ratio in Q mode?  What's the exit pupil?

 

Jon



#7 Jon Isaacs

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Posted 07 February 2017 - 12:34 PM

https://www.optcorp....-tfk6004qm.html

 

In the Q mode, the scope is F/16.

 

A 6.7 mm eyepiece provides a 0.41 mm exit pupil, it will be dim.

 

Jon



#8 dufay

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Posted 07 February 2017 - 12:56 PM

https://www.optcorp....-tfk6004qm.html

 

In the Q mode, the scope is F/16.

 

A 6.7 mm eyepiece provides a 0.41 mm exit pupil, it will be dim.

 

Jon

 

I might be mistaken but I believe the FS-60Q is a F10, like this one: https://www.optcorp....-tfk6004qe.html

 

From reading the description of the extender module in the link above, it seems like a device for converting the FS-60 CB (F5.9) into a FS-60Q (F10) that also could be used to extend the FS-60Q system (therefore the reference to F16). I'm no Takahashi expert, so I might be wrong.


Edited by dufay, 07 February 2017 - 12:57 PM.

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#9 surfindogg

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Posted 07 February 2017 - 01:13 PM

Sorry Jon, I should have clarified that. The FS60-Q is F10 as dufay linked to.

 

It is a great little scope with the option of F5.9 or F10 with the 1.7CQ extender module.

 

In CB mode fl 355 F5.9 the 6.7 give a 1.4 exit pupil and the 4.7 a 0.8. With my eyes it might be pointless going for the 4.7 at F10!

 

I will have to experiment with the eps I have already and the 2.5 powermate.


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#10 paul m schofield

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Posted 07 February 2017 - 03:44 PM

I had an ES 6.7mm and it was quite good, excellent sharpness and contrast. I now have the Meade 6.7mm UWA 4K series. I see little difference between them optically. I prefer the Meade for its compactness and smooth barrel. My other 82's are all Meade 5000 series including the very excellent 5.5mm. I really don't like the tapered barrels on the ES eyepieces so I'm sticking with the Meades. 


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#11 AxelB

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Posted 07 February 2017 - 06:27 PM

I had a Meade 5k 5.5. Very good optic but I sold it because of the greasy eyecup. I prefer the rubber of the ES.


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