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Is this the same Konig eyepiece design?

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#1 GaryJCarter

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Posted 18 November 2010 - 08:09 AM

I've been searching for a University Optics 32mm MK-80 Konig for some time and not had any luck finding one for sale. I've stumbled onto a Japanese website, Kasai Trading Company, that has these "Extra WideVue - 32mm" eyepieces for sale - they look to be the same design as the UO 32mm MK-80 Konig, maybe with a slight variation to one of the groups to further widen the AFOV by a few degrees. Is anyone familiar with this eyepiece? http://www.kasai-tra...xtrawidevue.htm

#2 junomike

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Posted 18 November 2010 - 02:33 PM

Gary, It does look very similar to my UO MK80, but the optics have to be slightly different as the UO MK80 has 80 Deg and the Kasai Trading Company lists theirs at 85 Deg. I was able to find a translated description below.

web page

Also, keep in mind that 29,500 Yen is $340USD! :shocked: :shocked: :shocked:

Mike

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#3 Mak2007

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Posted 18 November 2010 - 03:56 PM

OH MY GOD!!!... ARE ALL THESE KONIGS YOURS???
THEY ARE ALL ZEBRA!!!! ALSO THE KLEE BARLOW IS ZEBRA!
I WOULD DREAM WITH A COLLECTION LIKE YOURS... :bow: :bow: :bow: :bow: :bow: :bow:

PS. If you ever decide to sell your collection, please contact me :D

#4 junomike

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Posted 18 November 2010 - 05:42 PM

Mak2007, Those are indeed my Konig MK/Konig II's and not for sale. I'm a big UO fan (older classics, newer Ortho's) and also have the H.D.'s and the O.P.S. Series made for a short while. The MK's are great in my F10 SCT. I also have a few Naglers and a 28mm Pretoria (for scopes under F5).
Mike

#5 GaryJCarter

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Posted 18 November 2010 - 08:57 PM

Hi Mike,

Thanks for your reply. And I second the Kudos on your collection! I've been slowly collecting some classics too. I have both MK-70's (25mm & 40mm) along with two later model volcano tops (12mm and 16mm).

Milo replied to a PM I sent him....He's the only person I've been able to track down that actually has one of these EWV 32mm mystery eyepieces. He confirms the 85 degree AFOV. He also said he took his with him to Japan earlier in the year to inquire about its origins but could only confirm the Kasai Trading company connection.

I have also inquired to the folks at UO to see if they knew anything about this variant.

Kanpai!

#6 GaryJCarter

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Posted 18 November 2010 - 10:27 PM

Wow! I received a reply directly from Kasai-san himself!

"...our EWV-32mm is mostly identical to UO 32mm Konig MK-80; same manufacturer and same lens elements. Only the metal parts are different"

Armed with this information I'm guessing the difference in the AFOV is achieved by repositioning the Field Stop or manipulating its diameter.

#7 junomike

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Posted 19 November 2010 - 04:36 PM

Gary, That does sound like It has the same internals. I am curious as to how they can get more FOV with the same glass as I thought that by increasing the FOV you would have to decease the magnification. Being only 5 Deg, I guess It's possible. So are you going to get one?

Mike

#8 BillP

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Posted 19 November 2010 - 04:58 PM

To increase the FOV of an eyepiece, *generally* all you need to do is open the field stop some (a metal part) and this works to a point. Of course that off-axis you are opening might be aberrated more than the original design wanted. The Edmunds RKE is a good example. Current versions have a field stop in it and it is nice and sharp edge. The old version of it used the barrel as the field stop and the AFOV was aboit 10 deg larger. Of course the edge is now vignettet some and more severe aberrations out there if the focal ratio of the scope is too short. I have both versions :). So if all they are opening it up by is adding 5 more deg of AFOV, then should be doable by opening the field stop as long as its within the constraints of the 2" barrel diameter.

#9 Scanning4Comets

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Posted 19 November 2010 - 05:51 PM

Prob the same EP rebadged and the 85 degree tag just thrown in for good measure. :poke:

#10 GaryJCarter

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Posted 20 November 2010 - 05:36 PM

BillP said "Prob the same EP rebadged and the 85 degree tag just thrown in for good measure."

That what the folks at UO thought when I got their opinion....they said they may have been conservative.

I may pick one up just to try it out and see.

#11 junomike

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Posted 20 November 2010 - 11:38 PM

Well that makes sense as when I compared It to a 31T5 in a [air of NS11GPS, The MK80 seemed to have a noticeably larger FOV. The Nagler yields a 90X and .91 Deg and the MK80 88X and .91 Deg. If the AFOV is closer to 85 Deg than It would work out to 88X and .97 Deg which is about half degree larger and would be noticeable.

#12 Johndob

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Posted 23 December 2010 - 02:44 AM

On the same web page they have a 94 degree widefield web page

#13 junomike

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Posted 23 December 2010 - 08:36 AM

Ok, Now something is definitely fishy. Take a look at the 94 degree's twin! Looks Identical to me! twin

#14 Jim Rosenstock

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Posted 23 December 2010 - 08:41 AM

Also, keep in mind that 29,500 Yen is $340USD! :shocked: :shocked: :shocked:


I paid $300 new for mine about 8 years ago; it's a good, well-made eyepiece. No, it doesn't "do fast" like a Nagler, but the price tag is in line with its overalll quality IMO.

I seem to recall the MK-80 measuring out to "eighty-something" degrees; I'm pretty sure the Kasai product is a "clone".


BTW, I have a small herd of zebras, too!

Jim

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