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Kowa Highlander: New Eyepieces in the Pipeline!

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#51 Binomania.it

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Posted 18 January 2013 - 02:57 AM

Hello Kenny, you're right. The binoculars have a big problem with the zoom eyepieces : the collimation.
Anyway I'm pretty calm for two reasons. My exemplar of Kowa Highlander is perfectly collimated
We controlled it with a Zeiss collimator 4X. At 200X has a perfect collimation !
Luca Mazzoleni has not collimated my instrument. The Docter Aspectem 20-50X of my friend Konrad was well collimated. If Kowa would, could, use this zoom on the Highlander series I do not think that they would have problems to collimate the instrument at maximum magnification. Usually there are problems with eyepieces and economic binoculars.
In any way I want to specify that this is an eyepiece created for their series of spottingscopes. I asked kowa Italy if is possible a modification for the highlander series. I am waiting for a response

#52 Mark9473

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Posted 18 January 2013 - 03:19 AM

Pier, do they have a 2" adapter to put this eyepiece in a telescope? I'm really looking forward to hear more about this one.

#53 Binomania.it

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Posted 18 January 2013 - 03:33 AM

Hi Mark. at the moment There is no serial adapter. I just wrote to the manager of Kowa Germany with my first impressions. I collect often the demands of amateurs and i send to companies. I will do this thing also.
As soon as I have a response I will alert you
Kind Regards from Italy and Have a nice week end!
Piergiovanni

#54 Stellarfire

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Posted 18 January 2013 - 03:43 AM

Having already purchased all three Kowa fixed mag eyepieces for the Highlander, personally, I would prefer to see from Kowa another fixed mag eyepiece in the 70-100x mag range.

Stephan

#55 Rich V.

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Posted 18 January 2013 - 10:49 AM

Having already purchased all three Kowa fixed mag eyepieces for the Highlander, personally, I would prefer to see from Kowa another fixed mag eyepiece in the 70-100x mag range.


I think that's a reasonable maximum for an 82mm binocular; perhaps unreasonalbe to some... ;)

82x would give a 1mm exit pupil. Less than that just seems to be pushing too hard, IMO.

Those of us with the 100mm Miyauchi Saturns wondered why the factory Miya eyepieces came in 33x, 39x, 55x and then jumped all the way up to 150x! A .66mm exit pupil is pushing these binoculars past their practical limits. The concensus was that 75x and maybe 100x eyepieces at maximum would have been a more useful limit. That range of mag. was never produced except as aftermarket eyepieces by Harry Siebert.

Even in a binocular with "perfect" optics, when you go over 100x, collimation has to be exceedingly precise and eyepiece axial alignment must be spot on as well. I'd expect the user would need individual collimation skills to insure the usefulness of the binocular at that point.

Rich

#56 KennyJ

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Posted 18 January 2013 - 12:07 PM

Thanks for the extra info,Pier.

Hope you enjoy the weekend!

Kenny

#57 Andresin150

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Posted 18 January 2013 - 01:54 PM

Thanks Pier

I would like to have an ep similar to the Docter UWA 12,5mm,
something that would give 36x and more than 2.5 TFOV. Sharp to the edge. I'm not really interested in higher magnifications, just more quality..., althoug a good high magnification ep, say 75-80x seems appealing for terrestrial use...

#58 Guest_**DONOTDELETE**_*

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Posted 20 January 2013 - 07:48 AM

........
Those of us with the 100mm Miyauchi Saturns wondered why the factory Miya eyepieces came in 33x, 39x, 55x and then jumped all the way up to 150x! A .66mm exit pupil is pushing these binoculars past their practical limits. The concensus was that 75x and maybe 100x eyepieces at maximum would have been a more useful limit. That range of mag. was never produced except as aftermarket eyepieces by Harry Siebert.

Even in a binocular with "perfect" optics, when you go over 100x, collimation has to be exceedingly precise and eyepiece axial alignment must be spot on as well. I'd expect the user would need individual collimation skills to insure the usefulness of the binocular at that point.

Rich [/quote]

Sorry for the out of subject :bow:
:jump:
On my Saturn III I've done same esperience about magnification:
Tv pl 40mm with some bend of electrical tape on the barrel, give me a marvellous 19x.

Tv pl 32mm after turning the eypices until the green writings, (2/2.5mm) some turns of tape on the non machined parts give me a good 23.5x.

Their own 19.2mm give 39x, the other Miyauchi 25.3 give 30x, the 14mm, gives nice 54x and the 5mm gives good 150x.

Too much space, so I tried some other solutions:
Tv pl 11mm, machined until neally oll the green writins dispare, the barrel must be 3mm longer, after some bend of tape on the unmachined barrel, give good 68x. Unfortunely the narrow field of the plossel after have use the precedings Er66° :p are quite bit unsatisfaid.

:roflmao: In the opposit so much good are the Naglers 7mm
Machined to have a barrel :shocked: 5mm longher.
I though easy to do, looking at the long part chromium-plated, but was'nt, durin the turn machining, half of the eypice fall down :o :crazy:.
The turner call me very afraid, ;) luckely he did not knew the price of the eypice, I run tu him, and lukely enytings was irreparably, some other turnings, then glue to reconnect the parts :grin:
107.5x all the moon in the eypice, the best, that made a Saturn III far long away from every other. :roflmao:
Clear sky
Sergio

PS I tried also to take awey the thread for filter at the Nagler 3/6mm, but it das'nt make the barrel short inaf to reach focus. :( I'm not temerary inaf to kut more :question:

#59 Rich V.

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Posted 20 January 2013 - 11:04 AM

Hi, Sergio, welcome to CN!

Yes, there is always the option to modify existing eyepieces to fit these binocular telescopes that use proprietary eyepieces. Like you have done for your Miyauchis, others have modified Naglers in a similar fashion to fit the Kowa. You seem to be much more adventurous than most of us!

Thanks for sharing your experience with the Saturns! Here's the work of a gentleman in France who has had good success modifying his Miyauchis to accept other eyepieces. You may find it interesting.

http://www.valeasy.f...ue.php?page=104

http://www.valeasy.f...que.php?page=91

I'm sure someone could work over a Kowa in similar fashion if they had the machine shop and experience to do such work. It's not for the faint of heart, though.

Rich

#60 Andresin150

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Posted 20 January 2013 - 02:33 PM

Tamiyi, you think that the Docter eyepieces are machineable to make them work with the Kowas?

#61 Guest_**DONOTDELETE**_*

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Posted 20 January 2013 - 04:00 PM

Hi, Sergio, welcome to CN!

...... Here's the work of a gentleman in France who has had good success modifying his Miyauchis to accept other eyepieces. You may find it interesting.......
Rich


Hi, Rich, and everybody, it's not my first time on CN, since 2006 I come in, unlukely I'm unable to reach my old username Sergio E, so i've made a new one.

Europe is a so smoll land, so nearly evrithing about big binoculars, is quite easy to knew.
I lived for many years in France, and Miyauchis were for long time my fixsed idea.
Lukely the Saturn III solved the problem.
Good sky
Sergio

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#62 Tamiji Homma

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Posted 20 January 2013 - 05:09 PM

Hi Andres,

No, I don't think you can use Docter UWA 12.5 on Kowa Highlander.
Docter UWA 12.5 needs 8.2mm inward focus distance than Kowa 14mm eyepiece. You would need to modify Kowa's visual back (more likely replace with something different).

As I mentioned before, TMB 92SS f/5.5 + Baader Amici Diagonal + Baader MarkV binoviewer + Docter UWA 12.5 gives you 40x, 2.2 degree TFOV, 2.27mm exit pupil.

Yes, it has lesser light gathering capability than Kowa but it gives you wonderful wide view by the Docter UWA 12.5 and it comes with better color correction and going higher power with Barlow lens in case you want to view the Moon, planets...

Posted Image Posted Image

Tammy

#63 Andresin150

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Posted 21 January 2013 - 08:26 AM

Thanks Tammy

#64 Binomania.it

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Posted 01 February 2013 - 10:55 AM

Dear Friends, yesterday i've received an update to Mr Reisner, the German Manager of Kowa Europe. Unfortunately he confirmed that is not possible to modify this eye-piece for usage on the Highlander. I am so sorry. Have a nice week end.Piergiovanni

#65 Stellarfire

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Posted 01 February 2013 - 01:04 PM

Thanks for the update, Piergiovanni.

I am still hoping that Kowa will bring at least one additional eyepiece model (somewhere between 70-100x) for the Highlander.

Stephan

#66 Tamiji Homma

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Posted 03 February 2013 - 12:25 PM

Hi Stephan,

It looks like Harry @ Siebert Optics started making eyepieces for Kowa Highlander.

You can pick 4.5, 5.0, 5.5, 6.0, 6.5, 7, 8.5, 9, 10, 14, 18, 19, 20, 26mm.

http://www.siebertop... eyepieces.html

Tammy

#67 Stellarfire

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Posted 03 February 2013 - 02:12 PM

Hi Tammy,

Very interesting news, thank you for bringing this to the attention of us Highlander users!
Looking at the enlarged picture of the Highlander-compatible eyepiece on the webpage of Siebert Optics, it seems that the eyepiece barrel will not be locked by Kowa's proprietary spring-loaded locking mechanism. I will have to check with Harry Siebert about that point and how both eyepieces will be safely retained in the Highlander, when pointed to the zenith.

Stephan

#68 CosmicEclipse

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Posted 07 February 2013 - 01:36 PM

I just talked to him and I was told the locking mechanism consists of an O-Ring on the eye piece cylinder which kinda adds grip/friction when inserted in the binocular.

Also he can manufacture the eye piece body from either Aluminum or Delrin AKA (Polyoxymethylene).
The glass is made by a 3rd party company.

I'm very tempted to buy the 4.5mm pair....

Maybe Kowa will wake up to this competition and hurry to make their own?

#69 Rich V.

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Posted 07 February 2013 - 01:58 PM

I have 10mm and 15mm Siebert pairs for my Miyauchis. The 10mm has a clever spring loaded delrin ball that holds it in place while the 15mm uses the more conventional O ring. The O ring makes a very tight fit and it's a bit hard to remove the eypiece from the focuser. A little lube would likely help but I don't like the idea of anything oily near the optics.

While the Sieberts don't have a fancy locking mechanism or slick finish like the Kowas or Miyauchis, they do seem to do a good job at a reasonable price. With the Kowas in particular, due to the very high price of their factory eyepieces, the Sieberts will save you a bunch of money; enough for multiple pairs if you like.

Rich

#70 Stellarfire

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Posted 07 February 2013 - 02:16 PM

A little lube would likely help but I don't like the idea of anything oily near the optics.


I know one thing for sure: My Highlander will never be feeded with e.p's with oily or greasy o-rings and rubber particles from the o-rings itself. Will wait for the real thing from Kowa Japan. :)

Stephan

#71 Rich V.

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Posted 07 February 2013 - 02:59 PM

A little lube would likely help but I don't like the idea of anything oily near the optics.


I know one thing for sure: My Highlander will never be feeded with e.p's with oily or greasy o-rings and rubber particles from the o-rings itself. Will wait for the real thing from Kowa Japan.

Stephan


Well, I hope you don't have to wait too long. Good luck!

You don't have to grease the O rings and I don't think rubber particles are an issue. I use a bulb blower to keep the face of the rhomb under the focuser free of dust or other junk. They're just binoculars, you know! Having eyepiece options just makes them more useful... ;) Getting out and using them is the point!

Rich

#72 kcolter

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Posted 07 February 2013 - 04:16 PM

Are the prices for the Siebert eyepieces the price for a single eyepiece, or the price for a pair? Thanks

#73 Rich V.

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Posted 07 February 2013 - 05:37 PM

They are sold individually.

Rich

#74 Tamiji Homma

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Posted 13 April 2013 - 11:07 PM

Hi Stephan,

I decided to try the shortest focal length eyepiece, 4.5mm Harry offers for Kowa.
I'll let you know how it goes.

Tammy

#75 Stellarfire

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Posted 14 April 2013 - 01:26 AM

Hi Tammy,

Nice to hear from you. I will be very interested in your findings on the 4.5mm Sieberts.

Stephan






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