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 Kokusai Kohki Orthoscopic Eyepieces

 Kokusai Kohki OR eyepieces are hand crafted and individually inspected before we ship. They come with plastic eyepiece caps, and carry a one year Kokusai Kohki parts and labor warranty. My promise to you: You will either LOVE your OR eyepiece or you get your money back!
 User comment:
Your OR25 could have the highest sharpness, throughput, contrast and resolution theoretically possible. I`d say your OR 18s and especially the OR25 are in a class all their own regardless of maker and price.
M Zander (Nishinomiya City, Japan 
 
 Top Notch workmanship, design and optical performance
Maximum sharpness, resolution, throughput and contrast

--- At a very low price---

Japanese Orthoscopic Eyepieces
 
Get Real Japanese Orthoscope Eyepieces!

A few focal lengths have sold out,but the OR4 / 5 / 12.5 and 18mm eyepieces remain available in 0.965" barrel sizes. Compare size against the 1.25" size OR25 at upper left corner.
  Our world famous lineup of orthoscopic eyepieces sport the highest quality Japanese workmanship, sharp "eagle-eye" views and excellent color correction. Our OR eyepieces will satisfy even the most demanding planetary observer, including those used to much more expensive and "flashy" name brand eyepieces, but at 1/4 ~1/10 the cost! OR YOUR MONEY BACK!

Our OR eyepieces are lovingly handmade, one at a time by craftsmen at the Tokyo factory. Producing them now for over 40 years, you can be sure of optical, mechanical and design quality you can be proud of for years to come. High magnification inclined apo-refractor, Maksutov, SCT and Mewlon users will be especially pleased with their planetary and double star viewing performance. The gorgeous barrel design includes snug filter threads and a tight, sharp field stop that precisely defines the field of view. All OR eyepiece also include caps on both ends.

For maximum image definition, contrast and light transmission, the eye lens of each eyepiece is multicoated, all other surfaces are magnesium flouride coated. Eye relief is plentiful and images merge well when used in a binocular viewer. Apparent field of view of all focal lengths hovers in the 45< degree range.

This level of quality comes at the very low price of 4,800 yen each, meaning that getting even an entire set, or doubling up for binoviewing, is a more than reasonable proposition. Eyepieces weigh in at 65~95 grams for 1.25" and from 40 to 65 grams in the .965" size. Eye lens diameters for the shortest three focal lengths range from 3mm for the OR4, 4mm for OR 5 and 5mm for OR6.

Our OR eyepieces are available in either 1.25" (4mm / 5mm / 6mm / 7mm / 9mm / 12.5mm /18mm /25mm) or 0.965" (4mm / 5mm / 12.5mm /18mm ) barrel size. Please specify FL and barrel size upon your order. Every OR eyepiece includes plastic caps on both ends.

Please see below for eyepiece specs. The 1.25" barrel size ORs are usually in stock for immediate delivery. The 0.965" barrel size ORs and Japanese made Kelner and Erfle eyepieces are available on a special order basis, with delivery about 2~4 weeks from your order.



 
My promise to you: You will either love your OR eyepiece or you get your money back!


 
Made in Japan highest quality ERFLE eyepieces available in 16mm, 20mm and 25mm focal lengths (1.25" barrel only).
Kelner 6 / 9 / 12 / 18 / 20 and 25mm also available on a Made to Order basis (2~4 week delivery, please specify .965" or 1.25" barrel sizes)


Kokusai Kohki ORTHOSCOPIC (Or), KELNER (K) and ERFLE (ER) Eyepiece Specifications
Eyepiece
Type
AVAILABLE
Barrel Sizes
Eye Lens OD
(mm)
F.O.V (degrees)
Eye Relief (mm)
Weight (gr)
Item No
Item No
Price (Yen)
 For a currency conversion site
click here
.965"
1.25"
.965"
1.25"
.965"
1.25"
OR 4mm
.965" or 1.25"
4
41
41
3.5
40
80
1012
1004
4,800 Yen
OR 5mm
.965" or 1.25"
4.5
43
43
4.0
40
85
1013
1005
4,800 Yen
 OR 6mm
.965" or 1.25"
 5.8
43
 43
 4.8
42
 90
SOLD OUT
1006
 4,800 Yen
OR 7mm
.965" or 1.25"
6.5
42
42
5.6
45
90
SOLD OUT
1007
4,800 Yen
OR 9mm
.965" or 1.25"
8.3
42
42
7.2
47
92
SOLD OUT
1008
4,800 Yen
OR 12.5mm
.965" or 1.25"
11
44
44
10
50
96
1017
1009
4,800 Yen
OR 18mm
.965" or 1.25"
17
44
46
14.4
65
97
1018
1010
4,800 Yen
OR 25mm
.965" or 1.25"
21
45
47
20
76
100
SOLD OUT
1011
4,800 Yen
Kelner 6mm
.965" or 1.25"
5.8
42
42
4.8
55
85
1028
1020
3,300 Yen
Kelner 9mm
.965" or 1.25"
10
44
44
7.2
60
105
1029
1021
3,300 Yen
Kelner 12mm
.965" or 1.25"
8.5
40
40
4.0
62
120
1030
1022
3,300 Yen
Kelner 18mm
.965" or 1.25"
16.8
45
47
9.6
65
100
1031
1023
3,300 Yen
Kelner 20mm
.965" or 1.25"
16.8
45
47
15
65
100
1032
1024
3,300 Yen
Kelner 25mm
.965" or 1.25"
16.8
42
45
16
75
105
1033
1025
3,300 Yen
Erfle 16mm
1.25"
15.5
N/A
60
9.6
NA
175
N/A
1001
8,190 Yen
Erfle 20mm
1.25"
21
N/A
62
11
NA
175
N/A
1002
8,190 Yen
Erfle 25mm
1.25"
22
N/A
62
21
NA
175
N/A
1003
8,190 Yen
The above "SOLD OUT" 0.965" size OR eyepieces are out of stock and commencing a new production run requires a minuimum 500 pc order per size. Hence the SOLD OUT designation.....The good news is that we anticipate being able to deliver the remaining .965" size ORs, and all the .965" size Kelners, for the time being, with about a 2 ~ 4 week delivery time from order. The 1.25" ORs will continue to around for a while :- ) BG


We ship via fast EMS Airmail to anywhere in the world!
to ship you 1 ~ 3 OR eyepieces
Please add 2,000 Yen to your order
to ship you 4 ~ 6 OR eyepieces
Please add 2,500 Yen to your order
to ship you 7~10 OR eyepieces
Please add 3,500 Yen to your order
 to ship you 11+ OR eyepieces
Fee varies according to destination. Please request a quote
Payment via PayPal welcome! Our Paypal account is under my email address: magellan@kkohki.com

Sorry, no shopping basket... For orders and inquiries Please email me (Barry Gooley)

 


 
 Pentax Eyepieces

 




70 degree apparent field of view, Eye relief 20mm
Practically waterproof, to assure you of years of problem-free observing
Beautiful to look AT, as well as look through

Due to popular demand, Kokusai Kohki now offers our overseas friends the fabulous Pentax XO and XW series wide angle SMC (super multi-caoted) eyepiece lineup.Though not rock bottom low price, this premium eyepiece provides tack sharp and bright images to the edge of the very wide field. Adding in superior light throughput and plenty of eye relief, the XW series deserves a place in every serious observer`s eyepiece case. The Pentax XW series also offers the discriminating observer the following benefits:

* All focal lengths standardized with a dazzling 70 degree field of view, and generous 20mm of eye relief, for ease of viewing even when wearing glasses.

* A brand new design that incorporates high refractive index Lanthanum glass elements. This sophisticated design corrects and balances all optical abberrations for images that approach optical perfection. An added plus is the extra effort made to compensate for spherical aberations found in the human eye, virtually removing kidney bean and blackout effects. A truly easy to view through eyepiece.

* Proprietary Pentax multi-coatings on every air to glass surface, with special coatings also applied to all cemented surfaces, assuring you of superior light transmission (550nm transmits at approximately 96%, and overall transmission of all visible wavelengths measured at over 90%)

* Computer designed field stops placed at critical locations provide the highest degree of high contrast views

* Choose from 3.5mm, 5mm, 7mm, 10mm, 14mm, 20mm, 30mm and 40mm focal lengths. A full lineup of all your favorite focal lengths let you choose exactly the right eyepiece for low power viewing of Milky way star fields all the way to medium and high power planetary and lunar observing.

* The XW series conforms to a JIS 4 "daily use" waterproofing rating, assuring you that your eyepiece will give you maximum value over the years by remaining unaffected by the usual dewing and wetness that occur during your observation sessions (Note: this level does NOT assure waterproofing if the eyepiece is totally immersed in water).

* The WX series 3.5mm to 20mm eyepieces use a 1.25" size barrel and the XW30mm and XW40mm come with a 2 inch barrel.

* Height adjustable rotating eye caps let you easily place your eye at the exact location for comfortable viewing and perfect eye relief. Removing the eye cap exposes a 43mm / P0.75mm pitch male thread, for accessory attachment.

* All Pentax XW and XO eyepieces are threaded for standard 1.25" , or 2" size filters, depending on their barrel sizes.

 Pentax XW Series (visual) Eyepiece Specs
Focal Length
Field of View
Eye relief
Lens Design
 Field Stop(mm)
Size (mm)
Weight (gram)
Price (Japan Yen)
XW3.5mm
70 degree
20mm
5 group / 8 lens
4.3
61 x 137
405
32,800 Yen
XW5mm
70 degree
20mm
5 group / 8 lens
6.2
61 x 127
395
29,800 Yen
XW7mm
70 degree
20mm
6 group / 8 lens
8.8
61 x 120
390
29,800 Yen
XW10mm
70 degree
20mm
6 group / 7 lens
12.4
61 x 110
390
29,800 Yen
XW14mm
70 degree
20mm
6 group / 7 lens
17.6
61 x 97
365
29,800 Yen
XW20mm
70 degree
20mm
4 group / 6 lens
24.0
61 x 86
355
29,800 Yen
XW30mm
70 degree
20mm
6 group / 7 lens
36.2
76 x 123
740
43,800 Yen
XW40mm
70 degree
20mm
5 group / 6 lens
46.5
76 x 117
700
45,800 Yen
  Pentax X0 Series (high magnification visual and eyepiece projection) Eyepiece Specs
XO 2.5mm
   44 degree
3.9mm
3 group / 6 lens
 
37 x 56
105
28,300 Yen
XO 5mm
   44 degree
3.6mm
3 group / 5 lens
 
37 x 45
90
28,300 Yen
   Pentax XP Series (eyepiece projection) Eyepiece Specs
XP 3.8mm
N / A
N / A
3 group / 5 lens
 
30 x 33
40
NEARLY GONE *
16,000 Yen
XP 8mm
N / A
N / A
5 group / 6 lens
 
30 x 42
50
SOLD OUT
XP 24mm
N / A
N / A
5 group / 6 lens
 
30 x 69
70
NEARLY GONE *
23,200 Yen
*pls check availability at time of your order (as available quantities are so small right now. that they might actually already be sold out)
Pentax XF Series (for field scope and binoviewers) Eyepiece Specs
 XF 8.5mm
60 degree
18mm
4 group / 6 lens
 
43 x 83
150
15,750 Yen
 XF 12mm
60 degree
18mm
4 group / 6 lens
 
43 x 78
150
15,750 Yen


     
 XP Series Eyepiece
XP 3.8mm
XP 8mm
XP 24mm


We ship via fast EMS Airmail to anywhere in the world!
to ship one XW eyepiece
Please add 3,000 Yen to your order
for additional eyepiece
Fee varies according to destination. Please request a quote
to ship XO or XP eyepiece (and no XWs)
please use OR eyepiece EMS airmail pricing
Payment via PayPal welcome! Our Paypal account is under my email address: magellan@kkohki.com

Sorry, no shopping basket... For orders and inquiries Please email me (Barry Gooley)

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 VIXEN LVW Eyepieces

 


Highest quality Japanese design and finish, at a very reasonable price

Kokusai Kohki offers the Vixen wide angle LVW eyepiece lineup to our overseas friends and neighbors. The LVW lineup provides a wide 65 degree field of view, with plenty of eye relief. Special multi-coatings, a solid optical design and a Japanese standard excellent finish, are all included at a most reasonable price. For high end viewing quality without the high end price tag, we heartily recommend the Vixen LVW lineup, including the low cost and fun LV 8 ~ 24mm zoom eyepiece from the previous "LV" series of eyepieces. Benefits the Vixen LVW eyepiece series offers the discriminating observer include the following:

* For maximum light throughput and bright images, all lens surfaces are fully multi-coated.

* All LVW focal lengths provide a generous 20mm of eye relief, to allow many comfortable hours of viewing, even when wearing glasses

* LVW 3.5mm to 2mm are 1.25" barrel size, the NLVW30 and LVW42 are 2" barrel size, and all offer a nearly unvignetted full 65 degree field of view

* All LVW eyepieces are threaded either for standard 1.25" or 48mm size filters.

* The NLVW-30mmeyepiece provides a very bright, crisp 65 degree FOV with excellent color rendition. The NLVW-30`s new exterior is an interesting contrast to the rest of the LVW lineup and the eyepiece is strikingly lightweight, at only 363grams. Well priced, at only 20,160 yen, and perfect for low power wide field views through Schmidt Cassegrains, large aperture dobs and even short focal length achromat to apo refractors. Available now!

 VIXEN LVW Series Eyepiece Specs (1.25 inch sleeve)
Focal Length
Field of View
Eye relief
Lens Design
Weight (gram)
Price (Japan Yen)
LVW3.5mm
65 degree
20mm
5 group / 8 lens
510
21,000 Yen
LVW5mm
65 degree
20mm
5 group / 8 lens
500
20,100 Yen
LVW8mm
65 degree
20mm
6 group / 8 lens
495
17,600 Yen
LVW13mm
65 degree
20mm
6 group / 7 lens
460
18,400 Yen
LVW17mm
65 degree
20mm
6 group / 7 lens
440
19,300 Yen
LVW22mm
65 degree
20mm
4 group / 6 lens
430
21,100 Yen
  VIXEN LVW Series Eyepiece Specs (2 inch sleeve)
 NLVW30mm
 65 degree
 22.4mm
3 group / 5 lens
 363
 20,100 Yen
 LVW42mm
 65 degree
 20mm
 6 group / 7 lens
 545
 31,900 Yen
 VIXEN LV Series (visual) Zoom Eyepiece Specs
LV8 ~ 24mm
60 ~ 40degree
19mm
3 group / 6 lens
215
15,750 Yen



We ship via fast EMS Airmail to anywhere in the world!
to ship one LV Zoom or LVW eyepiece
Please add 2,500 Yen to your order
for additional eyepiece
Fee varies according to destination. Please request a quote
Payment via PayPal welcome! Our Paypal account is under my email address: magellan@kkohki.com

Sorry, no shopping basket... For orders and inquiries Please email me (Barry Gooley)

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Eyepiece Bolt Cases

Tough screw-on plastic bolt covers protect eyepieces from dust, grime, wetness and abrasion. Choose from 3 sizes that will fit all but the latest super sized eyepieces. Low cost, light weight and with tight threads that do not come undone unless you want them to. Cheap insurance that will keep you eyepieces individually protected, and will probably do so forever, with no maintenance. Will also accept labeling with an oil based felt pen. (Water resistant but not waterproof- not to be immersed in water with your preciosu eyepiece inside!). These bolt cases probably have a thousand other uses as well. How about nuts and bolts, coins, trail mix or even coffee grounds.... ; - )

 

 
 
     
 

  Part #
  Part Name
  Inside dimensions
  Price
NEC1
Screw on Bolt Case "Large"
 64mm x   115mm
580 yen
NEC2
Screw on Bolt Case "Medium"
 48mm x   102mm
380 yen
NEC0
Screw on Bolt Case "Small"
 40mm x    80mm
280 yen

Sorry, no shopping basket... For orders and inquiries Please email me (Barry Gooley)

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