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Masuyama 20mm coming out

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13 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



#7 ThomasM

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Posted 18 November 2019 - 05:46 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

I got two Masuyama 20 mm today, they are intended for binoviewing with the APM 70mm 90 degree binocular. Now I am waiting for the adapters from Japan...

 

An initial impression, the huge FOV is very  impressive..smile.gif .

 

Thomas


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#8 25585

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Posted 18 November 2019 - 05:50 PM

12.5mm eye relief. Pass. 


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#9 old_enough

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Posted 19 November 2019 - 07:06 AM

I got two Masuyama 20 mm today, they are intended for binoviewing with the APM 70mm 90 degree binocular. Now I am waiting for the adapters from Japan...

 

An initial impression, the huge FOV is very  impressive..smile.gif .

 

Thomas

Hi Thomas,

 

sounds great! I hope some day I may compare them to my 20mm Nagler T5. Shouldn‘t Matsumoto-san‘s adapters work with any 2“ eyepiece (within sensible field stop sizes)?

 

Best,

Sebastian



#10 ThomasM

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Posted 19 November 2019 - 04:23 PM

Hi Sebastian,

 

yes, a comparison with the 20 mm Nagler will be very interesting, however I think it is from beforehand clear that the Masuyamas can not compete in off axis sharpness.

I was also expecting that the adapters would fit for all 2" Masuyama eyepiece, but Tatsuro mailed me that this seems not to be the case. But I am still optimistic, I have to wait.

 

Thomas



#11 ThomasM

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Posted 06 December 2019 - 03:51 PM

The adapter for the APM bino arrived today, so now I can use the 20mm Masuyamas for binocular viewing with 70 mm aperture.  My first impression, very nice wide field of view. And some additional good news, the adapter als works for the 32 mm Masuyamas:smile.gif

 

Thomas


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#12 Spikey131

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Posted 06 December 2019 - 06:21 PM

Looking forward to a shootout with the TV Apollo 20 grin.gif



#13 faackanders2

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Posted 06 December 2019 - 07:29 PM

Looking forward to a shootout with the TV Apollo 20 grin.gif

Sorry Apollo only went up to 17 (excluding the movie), but Apollo  11 is the major one worth celebrating (especialy with Al working on the Apollo capsule window 110 deg optics.



#14 faackanders2

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Posted 06 December 2019 - 07:29 PM

Sorry Apollo only went up to 17 (excluding the movie), but Apollo  11 is the major one worth celebrating (especially with Al working on the Apollo capsule window 110 deg TFOV optics.




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