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This Page Updated
23rd November 2017

Professional Standard Hi-Le, TOE, TAK-UW, Abbe Ortho
HD-Orthoscopic's from Kokusai-Kohki
The Fabulous 2" Eyepieces Have Returned!
 Here you will find the leading brands of Eyepieces available from Astronomy & Electronics Centre - Just click on any of the links above to jump to that brand, or just scroll down the page and view them all.

There are several types of eyepieces in the market. Some look very good; some have long eye-relief; some are sharp; some are cheap; some are expensive! However, when it comes to the highest contrast, maximum sharpness, high light transmission, good eye-relief and the best colour rendition, the Takahashi "LE" and "HI-LE" eyepieces have no rivals!

Below are a few comments from an expert amateur astronomer, who wrote a three-page test report on the Takahashi "LE" oculars.

Under test the LE Series oculars provided:

* Increased light transmission through the eyepiece. In other words all the LE oculars provide a brighter image;
* Increase in contrast in every case;
* Sharper images in every case;
* Increase resolution in every case.

The LE series improved every object throughout all the focal length ranges, and in comparison to both standard Plossl field of view and wide-field oculars. This is in brightness, contrast, image resolution and detail of bright and faint objects!

"...I cannot forget when, about two years ago, I had trouble splitting the double star Antares with my Takahashi FS-102 FL refractor, using five different well-known 7.5mm oculars. I started thinking that the said refractor wasn't as good as I thought. Eventually, it dawned upon me that may be I wasn't using the best oculars for the job. However, all my worries disappeared as soon as looked through an LE 7.5mm ED ocular, which fortunately I had still in stock. Antares' green companion, 7th-magnitude star, was there in all its glory!"
(Claude Voarino AEC, 2013)
LE & Hi-LE Technical Specifications and Price
Part Number Model Apparent Field Eye-Relief Weight Barrel Diam.
TKA00520 LE-5mm ED 52 10mm 130g 31.7mm
TKA00521 LE-7.5mm D 52 10mm 115g 31.7mm
TKA00528 LE-10mm 52 - - 31.7mm
TKA00522 LE-12.5mm 52 9mm 100g 31.7mm
TKA00523 LE-18mm 52 13mm 125g 31.7mm
TKA00524 LE-24mm 52 17mm 150g 31.7mm
TKA00525 LE-30mm 52 20mm 170g 31.7mm
TKA00526 HI LE-2.8mm 42 5.8mm 130g 31.7mm
TKA00527 HI LE-3.6mm 40 7.5mm 130g 31.7mm
TKA00531 LE-50mm 52 40mm 570g 50.8mm

CLICK HERE for TAKAHASHI Eyepiece Prices
Takahashi LE and Hi-LE Eyepieces are well known to be the best eyepieces on the market for sharpness, colour correction, contrast and resolution; now Takahashi has expanded their range of professional-standard eyepieces with the new TAK-UW Extra-Wide-Field (90) Series
Takahashi TAK-UW Series
Takahashi TAK-UW Technical Specifications
Part Number Model Focal Length Apparent FoV Eye Relief Weight
TKA00600 TAK-3.3UW
(10 Elements in 6 groups)
3.3mm 90 degrees 12mm 470g
TKA00601 TAK-5.7UW
(10 Elements in 6 groups)
5.7mm 90 degrees 12mm 450g
TKA00602 TAK-7UW
(8 Elements in 5 groups)
7mm 90 degrees 12mm 430g
TKA00603 TAK-10UW
(8 Elements in 5 groups)
10mm 90 degrees 12mm 420g

TAK-5.7UW mounted on TOA-130
TAK-5.7UW mounted on TOA-130
CLICK HERE for TAKAHASHI Eyepiece Prices
TAKAHASHI Abbe-Ortho Series
Takahashi Abbe-Orthoscopic Technical Specifications
Part Number Model Apparent FoV Eye Refief Weight
TKA00700 Abbe 6mm 44 4.8mm N/A
TKA00701 Abbe 9mm 44 7.5mm 80g 
TKA00702 Abbe 12.5mm 44 10mm N/A
TKA00703 Abbe 18mm 44 15mm 110g
TKA00704 Abbe 25mm 44 22mm N/A
TKA00705 Abbe 32mm 44 28mm 155g

TAKAHASHI Abbe-Orthoscopic Eyepieces
Ultimate visual observation is observation with an excellent eyepiece for an excellent telescope close to the diffraction limit. With this combination, you can deliver the resolution of the telescope optical system to the entire field of view. TOE eyepiece developed based on this concept.
If the astronomical telescope equipped with a high performance objective lens is used not only for our products but also for other companies' products using the TOE eyepiece, we can demonstrate the performance of the objective lens without regret and high resolution that you can fully convince over the entire field of vision we can provide.

The TOA, FOA, FSQ, TSA, Mewlon-CRS etc. which corrected aberration to the limit is not only used as a photographic telescope, but also it is a system that you can fully convince eye visual users by using TOE eyepiece .

The TOE eyepiece was designed with priority on easy-to-view magnification, easy to use when observing the moon / planet with high magnification. When TOE - 2.5 mm, TOE - 3.3 mm, TOE - 4.0 mm are attached to TOA - 130, it becomes 400 times, 300 times, 250 times respectively. This is a magnification that across the 320 times excessive magnification for double stars, it is just a good focal length lineup to change the magnification according to the sky conditions. In order to obtain high magnification with FSQ of f / 5, it is better to obtain a higher magnification after attaching a dedicated extender to f / 8.

The apparent field of view is same as other LE series at 52 wider than 40 of Hi - LE, and the eye relief also secures 10 mm which is the same as LE - 5 mm and LE 7.5 mm, the same as other eyepieces of Takahashi at parfocal, it is easy to use enough as an ultra high magnification eyepiece. Even if you use it for planet only for wide field of view, it will be easy to use as it is easier to catch into the field.

Evaluation of aberrations by Strehl ratio, spot diagram
When the eyepiece is combined with the objective lens, it becomes an afocal optical system which does not form an image, and the evaluation of aberration was difficult. In Takahashi, the design of the eyepiece is optically designed as an afocal system in combination with TOA - 130. In addition, as a wave optical evaluation, we use the spot diagram as the Strehl ratio which is the ratio with the diffraction limit optical system, geometrical optics evaluation. If you look at the figure below, you can see that the Strehl ratio falls to over 98% in the entire visual range of wavelengths from 486 nm to 656 nm and in the whole visual field.

There is not much to disclose the spot diagram of the eyepiece so it is not familiar, but the round frame becomes 10 micro radians of the angle. The resolving power of an aplanatic lens with a 130 mm aperture can be determined from the dose limit equation as 0.9 s squares = 4.5 microradians, so all the TOE series are far below the diffraction limit in all fields of view. In addition, it can be seen that magnification chromatic aberration (color misregistration in the surroundings) which is difficult to completely eliminate with the eyepiece is also very small.

Takahashi's unique lens composition
Optical design of the TOE series of 4 groups / 6 elements is Takahashi's original lens composition which optimizes totalization of the front group 's smice lens and the rear group' s master lens, and includes spherical aberration, chromatic aberration, field curvature, astigmatism , Distortion aberration, chromatic aberration of magnification and other various aberrations are designed to be minimized.
Also, by selecting the lens curvature that reduces ghosts and flares, by designing hardware, you can observe the moon and the planet with a good contrast image. Broadband multi-coat is applied to each boundary surface of the lens, and on the surface where necessary, a flat multi-coat with less fluctuation in transmittance due to wavelength is applied to correct the color balance and we are striving to improve the contrast.
Also, sanitizing is done on the edge surface of the lens, and we are trying to prevent stray light by carrying out a matte treatment also on metal parts.

Takahashi TOE Series Technical Specifications
Part Number Model Apparent FoV Elements/Groups Eye Refief Barrel Size Tube Diam. Tube Length Weight
TKA00613 TOE-2.5mm 52 6/4 10mm 31.7mm 39mm 76mm 150g
TKA00614 TOE-3.3mm 52 6/4 10mm 31.7mm 39mm 72mm 140g
TKA00615 TOE-4mm 52 6/4 10mm 31.7mm 39mm 68mm 130g

CLICK HERE for TAKAHASHI Eyepiece Prices

Kokusai Kohki continues the tradition of offering the highest quality Japanese made Orthoscopic eyepieces with the introduction of our brand new FUJIYAMA HD-OR eyepiece line up. Fujiyama HD-ORs are hand crafted at our Tokyo factory, and individually inspected by us before we ship.

   Named after the Japanese name for that sky reaching symbol of Japan, Mt. Fuji, the FUJIYAMA HD-ORs come standard with multi-coatings on all four air to glass surfaces, giving them extended light throughput, and brighter images overall, as compared to our previous OR eyepiece line up. And all lenses are edge blackened to reduce internal light scatter and reflections to an absolute minimum. (And, for the record, cemented lens surfaces are UNcoated).

   The entire Fujiyama lineup is parfocal, accepts standard 1.25" filters, and comes with plastic eyepiece caps. The chrome barrels of the Fujiyama HD-ORs are straight up and down, and we have removed the helpful, but also often annoying, safety groove.

   Solid construction, bright, cleaner and sharp views throughout a fully corrected 42 degree FOV with sharp field stops, makes the Fujiyamas perfect for every type of viewing, and are also an excellent match with high end apochromats for hard core planetary, lunar, solar and double star viewing.

   Each eyepiece carries a one year Kokusai Kohki parts and labor warranty.

"Our promise to you: you will either LOVE your FUJIYAMA HD-OR eyepiece or you get your money back!"
..from the Kokusai Kohki website.
Fujiyama HD-OR Eyepieces
Product ID. Focal
Size F.O.V. Coatings Eye Relief Field
Lens OD
Weight Price
1004 HD-OR
1.25" 42 M/C + edges
3.4mm 2.6mm 4.0mm ~ 60g $120.00
1005 HD-OR
1.25" 42 M/C + edges
4.0mm 3.4mm 4.5mm ~ 60g $120.00
1006 HD-OR
1.25" 42 M/C + edges
4.9mm 4.2mm 5.8mm ~ 60g $120.00
1007 HD-OR
1.25" 42 M/C + edges
6.1mm 4.8mm 6.5mm ~ 60g $120.00
1008 HD-OR
1.25" 42 M/C + edges
7.6mm 6.3mm 8.3mm ~ 60g $120.00
1009 HD-OR
1.25" 42 M/C + edges
10.4mm 9.2mm 11.0mm ~ 80g $120.00
1010 HD-OR
1.25" 42 M/C + edges
15.2mm 12.5mm 16.0mm ~ 100g $120.00
1011 HD-OR
1.25" 42 M/C + edges
22.2mm 17.4mm 21.0mm ~ 120g $120.00
Fujiyama HD-OR Eyepieces
Model Size Field of View Price
Masuyama 32mm 2" Barrel 85 FOV $478.00
Masuyama 45mm 2" Barrel 53 FOV $612.00
Masuyama 50mm 2" Barrel 53 FOV $736.00
Masuyama 60mm 2" Barrel 46 FOV $885.00
NIKON & PENTAX Eyepieces
NIKON Model Price
EiC-16 (1.6x Extender) $330.00
NAV-5mm SW $463.00
NAV-7mm SW $463.00
NAV-10mm SW $463.00
NAV-14mm SW $463.00
NAV-17.5mm SW $538.00
NAV-12.5mm HW $1,329.00
NAV-17mm HW $1,342.00
PENTAX Model Price
XW 3.5mm $492.00
XW 5mm $463.00
XW 7mm $463.00 
XW 10mm  $463.00 
XW 14mm  $463.00 
XW 20mm  $463.00 
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The above images and information and gathered from various online sources

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