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Masuyama 20mm coming out

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5 replies to this topic

#1 nicknacknock

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Posted 18 September 2019 - 11:08 PM

For those into Masus, a 20mm 2" 85° is coming out. 

 

Nice to have more choices!


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#2 Tyson M

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Posted 18 September 2019 - 11:43 PM

Looks awesome!

 

Eye relief is the main concern of mine.  Love Masuyama's though. 


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#3 Scott99

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Posted 20 September 2019 - 01:02 PM

It's amazing that this gentleman sees the stars as points across the 85-degree FOV at f/5.6.  He must be the world-champion of focus accomodation!    

 

At f/9 I liked the 26mm very much but it wasn't even close to being sharp to the edge.  These are excellent minimum-glass widefields for longer f-ratio scopes IMO.  The bodies are clean and minimalist and not cluttered up with undercuts & big logos & sliding eyeguards, etc.


Edited by Scott99, 20 September 2019 - 01:05 PM.

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#4 Astrojensen

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Posted 20 September 2019 - 01:09 PM

It's amazing that this gentleman sees the stars as points across the 85-degree FOV at f/5.6.  He must be the world-champion of focus accomodation!    

That, or the curved focal planes of the eyepiece and the telescope are closely matched. That's actually not impossible. Haven't seen any published data on the field curvature on the Masuyama's though, so can't say for sure that this is what's happening. 

 

 

Clear skies!
Thomas, Denmark



#5 skullpin

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Posted 20 September 2019 - 05:27 PM

Huh?!? Why not 1.25" to match their max FOV 32mm in 2"? I suppose it would not be some magical 85 degrees (more around 81 degrees) to match the rest of their line, but that would be a trade-off I would accept. Disappointed.

 

Keith


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#6 ThomasM

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Posted 15 October 2019 - 04:47 PM

Yes, I was also hoping that it would be 1.25".

 

I intend to use it in a APM bino, which is only 1.25". One the other hand you can with some luck also attach larger eypieces.

 

http://ems-bino.com/...0deg-binocular/

 

Anyway, has anybody purchaised this eyepiece and give a report?

 

Thomas




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