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Kenko NES-90 (90/1300 Achromat)

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#1 Marco1968

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Posted 17 June 2019 - 10:14 AM

Greetings,

 

admittedly, I can hardly resist the charm of old long tube refractors.

 

Recently I added to my small collection of vintage telescopes a Kenko 'NES-90' 90/1300 achromat, complete with all the documentation and accessories that were originally part of the set. According to what I think is a quality certificate, this telescope was produced in 1990.

 

The Kenko 90/1300 is well regarded amongst the italian astro amateurs community, although all those I have read about are later models featuring the light blue color for both the OTA and NES mount. My sample has the previous black-and-white color for the OTA while the NES mount is all black.

 

A sensible difference with later models lies in the objective cell that in my sample can be collimated with three couples of push-pull screws.

 

Visually the telescope shows a nice star test, with diffraction ring patterns quite similar between extra and intra focal position. In intra focal the first diffraction ring looks to me a bit more diffuse on its border than in extra, with the adjacent, internal first black ring a teeny bit darker than its extra counterpart.

 

In focus the stars look like textbook Airy disks surrounded by a faint first diffraction ring, a quite 'classical' view.

 

The celestial views are very 'calm' as is to be expected by the relaxed f14,4 focal ratio, no chromatic aberration is apparent in the center of the field of view.

 

Now for some photographs of the newcomer, mount and accessories.

 

Would love to hear from others CNers experiences with this old school achromat.

 

Clear Skies from Italy!

Marco

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#2 Marco1968

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Posted 17 June 2019 - 10:15 AM

Closeup of the collimatable lens cell

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#3 Marco1968

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Posted 17 June 2019 - 10:17 AM

Detail of the NES mount

 

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#4 Marco1968

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Posted 17 June 2019 - 10:18 AM

OTA label, eyepieces and diagonal 

 

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#5 rolo

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Posted 17 June 2019 - 10:18 AM

Is it me or do I see hints of Vixen?

 

Those eyepieces have a hint of Pentax 60c eyepieces...


Edited by rolo, 17 June 2019 - 10:21 AM.

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#6 Marco1968

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Posted 17 June 2019 - 10:19 AM

The original documentation

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#7 Marco1968

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Posted 17 June 2019 - 10:21 AM

Hi Rolo,

 

indeed it looks like... I have no idea whether this early Kenko objective was possibly made by Vixen.

From what I have read, people rate the views from the Kenko 90/1300 a bit better that those from the quite similar Vixen 90L 90/1300. I can not speak by my direct experience, though.

 

Clear Skies,

 

Marco


Edited by Marco1968, 17 June 2019 - 10:24 AM.

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#8 memento

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Posted 17 June 2019 - 11:26 AM

Beautiful and rare scope.

Does it have any manufacturer markings anywhere? The rear end and focuser don’t look like Vixen but more like Towa or Dai-Ichi Kogaku to me...?
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#9 Marco1968

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Posted 17 June 2019 - 11:42 AM

Hello,

 

thanks for your appreciation!

 

The only marking on the OTA is the gold and blue label showing Kenko as manufacturer and the telescope serial number.

There are no other markings anywhere, neither on the lens cell assembly, nor on the focuser.

 

The mount is well known and undoubtedly Kenko (identical to the later light blue model) and all three eyepieces have 'Kenko' lightly engraved on them and filled in white. The diagonal has no marking at all and appears to be a cheaper build if compared with the eyepieces.

 

The focuser features a focus-lock lever on the right side of it when looking from the eyepiece side.

This locking lever is found also on later, light blue examples of the Kenko 90/1300, I honestly do not know it it was used by other manufaturers as well.

 

One document refers to a series of telescopes marketed on the NES mount, three refractors having apertures of, respectively, 60, 80 and 90mm, all looking extremely similar except, of course, for their tube lenght (doh!).

 

Clear Skies,

 

Marco



#10 Bomber Bob

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Posted 17 June 2019 - 03:30 PM

Great Score!  Kenko made a push to sell in Europe vs the USA.

 

Kenko / Pentax / Vixen - Hardware Similarities

 

- Eyepieces could be from a Pentax J-60, or a Bushnell Banner 1000;

 

- If the NES Mount is as robust as the KES Mount that came with my 125C, it's a Super Polaris equivalent;

 

- Focuser is identical with the Bushnell (HINO/MIZAR) Banner 1000


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#11 Marco1968

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Posted 17 June 2019 - 04:36 PM

Hello BB,

thank you for the hints, I knew nothing about the Bushnell Banner 1000 until your remark.

I noted few images of it here in CN and, sure enough, the 'Bausch & Lomb' german equatorial mount is identical to the Kenko NES except for the wooden tripod legs.

Apparently another case of re-branded astro gear.

Oh, I forgot to state in my first post, this Kenko NES-90 set arrived directly from Japan.

I won a Yahoo auction for a very reasonable price and, at the end, the shipment plus the import taxes was higher than the set itself... fortunately non that much to be fired by my CFO, you all know!

Clear Skies!

Marco
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#12 Marco1968

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Posted 17 June 2019 - 04:56 PM

I thought some more images of the accompanying documentation could be interesting... 

 

Here the front page of the leaflet describing the telescope, with original price!

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Edited by Marco1968, 18 June 2019 - 02:17 AM.

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#13 Marco1968

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Posted 17 June 2019 - 04:57 PM

The rear page of the same leaflet, with description of accessories

 

 

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#14 Marco1968

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Posted 17 June 2019 - 05:00 PM

This small leaflet seems to me a warranty certificate... I cannot read it but note the red stamp and the date, likely March 28th, 1990.

 

Maybe still valid???

 

 

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#15 Marco1968

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Posted 17 June 2019 - 05:02 PM

One more, the cardboard astrolabe.

I should learn kanji on time or another...

 

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#16 Marcus Roman

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Posted 20 June 2019 - 05:41 AM

I thought some more images of the accompanying documentation could be interesting... 

 

Here the front page of the leaflet describing the telescope, with original price!

Compliments! Really cool!!!


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#17 Marcus Roman

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Posted 20 June 2019 - 05:43 AM

Greetings,

 

admittedly, I can hardly resist the charm of old long tube refractors.

 

Recently I added to my small collection of vintage telescopes a Kenko 'NES-90' 90/1300 achromat, complete with all the documentation and accessories that were originally part of the set. According to what I think is a quality certificate, this telescope was produced in 1990.

 

The Kenko 90/1300 is well regarded amongst the italian astro amateurs community, although all those I have read about are later models featuring the light blue color for both the OTA and NES mount. My sample has the previous black-and-white color for the OTA while the NES mount is all black.

 

A sensible difference with later models lies in the objective cell that in my sample can be collimated with three couples of push-pull screws.

 

Visually the telescope shows a nice star test, with diffraction ring patterns quite similar between extra and intra focal position. In intra focal the first diffraction ring looks to me a bit more diffuse on its border than in extra, with the adjacent, internal first black ring a teeny bit darker than its extra counterpart.

 

In focus the stars look like textbook Airy disks surrounded by a faint first diffraction ring, a quite 'classical' view.

 

The celestial views are very 'calm' as is to be expected by the relaxed f14,4 focal ratio, no chromatic aberration is apparent in the center of the field of view.

 

Now for some photographs of the newcomer, mount and accessories.

 

Would love to hear from others CNers experiences with this old school achromat.

 

Clear Skies from Italy!

Marco

A beauty!


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#18 Marcus Roman

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Posted 20 June 2019 - 05:44 AM

Detail of the NES mount

Wow! Seems in pristine conditions!


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#19 Marco1968

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Posted 20 June 2019 - 05:56 AM

Hello Marcus,

many thanks for your kind words!

Now I feel really proud for having brought to CN 'Classics Telescopes' community few hints of the old samurai wink.gif

All the Best,

Marco 


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#20 Marcus Roman

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Posted 20 June 2019 - 10:16 AM

Hello Marcus,

many thanks for your kind words!

Now I feel really proud for having brought to CN 'Classics Telescopes' community few hints of the old samurai wink.gif

All the Best,

Marco 

Never had a Kenko 90/1300 but have a Vixen 90L f1300 and a shorter Kenko 80/1000: best achromats I ever met and which can fight with my apos (and have several premium 3" and 4" apos)..


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