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Kokusai Kohki Orthoscopic Eyepieces

All OR eyepieces come with caps, are hand inspected before shipment, 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!
 

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" or .965" barrel sizes, in the following focal lengths: 4mm / 5mm / 6mm / 7mm / 9mm / 12.5mm /18mm /25mm. Please specify FL and barrel size upon your order. Each eyepiec includes plastic caps on both ends.

(OR eyepiece specs below. We also offer Kelner and Erfle eyepieces on a made to order basis)



 
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.


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 currency conversion
specifics click here

.965"

1.25"

.965"

1.25"

.965"

1.25"

OR 4mm

.965" or 1.25"

4

41

41

3.5

40

80

1004

1012

4,800 Yen

OR 5mm

.965" or 1.25"

4.5

43

43

4.0

40

85

1005

1013

4,800 Yen

OR 6mm

.965" or 1.25"

5.8

43

43

4.8

42

87

1006

1014

4,800 Yen

OR 7mm

.965" or 1.25"

6.5

42

42

5.6

45

90

1007

1015

4,800 Yen

OR 9mm

.965" or 1.25"

8.3

42

42

7.2

47

92

1008

1016

4,800 Yen

OR 12.5mm

.965" or 1.25"

11

44

44

10

50

96

1009

1017

4,800 Yen

OR 18mm

.965" or 1.25"

17

44

46

14.4

65

97

1010

1018

4,800 Yen

OR 25mm

.965" or 1.25"

21

45

47

20

76

100

1011

1019

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

Kelner 30mm

.965" or 1.25"

16.8

40

42

19.5

75

110

1034

1026

3,300 Yen

Kelner 40mm

1.25"

16.8

NA

40

19.5

NA

175

NA

1027

3,300 Yen

Erfle 16mm

1.25"

15.5

NA

60

9.6

NA

175

NA

1001

8,190 Yen

Erfle 20mm

1.25"

21

NA

62

11

NA

175

NA

1002

8,190 Yen

Erfle 25mm

1.25"

22

NA

62

21

NA

175

NA

1003

8,190 Yen



We ship via fast EMS Airmail to anywhere in the world!

to ship you 1 ~ 3 OR eyepieces

Please add 1,500 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

Will provide a quote

Payment via PayPal welcome! Our Paypal account is linked to my email address: magellan@kkohki.com

Questions, comments, concerns? Please email me (Barry Gooley)

           



 


Made in Japan 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

Size (mm)

Weight (gram)

Price (Japan Yen)

XW3.5mm

70 degree

20mm

5 group / 8 lens

61 x 137

405

34,400 Yen

XW5mm

70 degree

20mm

5 group / 8 lens

61 x 127

395

31,200 Yen

XW7mm

70 degree

20mm

6 group / 8 lens

61 x 120

390

31,200 Yen

XW10mm

70 degree

20mm

6 group / 7 lens

61 x 110

390

31,200 Yen

XW14mm

70 degree

20mm

6 group / 7 lens

61 x 97

365

31,200 Yen

XW20mm

70 degree

20mm

4 group / 6 lens

61 x 86

355

31,200 Yen

XW30mm

70 degree

20mm

6 group / 7 lens

76 x 123

740

55,400 Yen

XW40mm

70 degree

20mm

5 group / 6 lens

76 x 117

700

57,500 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

16,000 Yen

XP 8mm

N / A

N / A

5 group / 6 lens

30 x 42

50

19,600 Yen

XP 24mm

N / A

N / A

5 group / 6 lens

30 x 69

70

23,200 Yen

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

Will provide a quote

to ship XO or XP eyepiece

please use OR eyepiece EMS airmail pricing

Payment via PayPal welcome! Our Paypal account is linked to my email address: magellan@kkohki.com

Questions, comments, concerns? Please email me (Barry Gooley)




 Made in Japan VIXEN Eyepieces

   

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

Due to so many requests, Kokusai Kohki now 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 also 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

* All LVWs are 1.25" barrel size and offer a nearly unvignetted full 65 degree field of view

* All LVW eyepieces are threaded for standard 1.25" size filters.

 VIXEN LVW Series (visual) Eyepiece Specs

Focal Length

Field of View

Eye relief

Lens Design

Weight (gram)

Price (Japan Yen)

LVW3.5mm

65 degree

20mm

5 group / 8 lens

510

20,790 Yen

LVW5mm

65 degree

20mm

5 group / 8 lens

500

20,160 Yen

LVW8mm

65 degree

20mm

6 group / 8 lens

495

17,640 Yen

LVW13mm

65 degree

20mm

6 group / 7 lens

460

18,480 Yen

LVW17mm

65 degree

20mm

6 group / 7 lens

440

19,320 Yen

LVW22mm

65 degree

20mm

4 group / 6 lens

430

21,160 Yen

LVW42mm

72 degree

20mm

6 group / 7 lens

545

31,800 Yen

 VIXEN LV Series (visual) Zoom Eyepiece Specs

LV8 ~ 24mm

60 ~ 40degree

19mm

3 group / 6 lens

215

16,800 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

Will provide a quote

Payment via PayPal welcome! Our Paypal account is linked to my email address: magellan@kkohki.com

Questions, comments, concerns? Please email me (Barry Gooley)








Made in GERMANY TMB Eyepieces

Combining highest contrast with razor sharpness, the TMB is perhaps the ultimate planetary eyepiece.

Though not made in Japan, as the local rep for TMB products in Japan, we have recieved a surprising number of orders for the venerable German made TMB eyepiece lineup, from all over the world. At the request of a number of our foreign customers, I will take the liberty to place these here on our Japanese products pages, as "honorary" Japanese products.

TMB eyepieces are designed by Thomas Back of the USA and made in Germany to extremely high standards in Germany under the direction of APM. TMBs utilize extremely high refractive index glass polished with excrutiating slowness to a nearly unprecendented level of surface perfection, providing the most discriminating planetary observer with a no-compromise, ultimate of high contrast and image clarity. A trade off for this single minded design is a narrow 30 degree FOV that relegates TMB eyepieces mainly to planetary observations but we have also heard many nice things about the TMBs from local double star and globular cluster observers. The near 99% light throughput, image contrast and sharpness, on top of an amzing level of background "noise" suppression lets me confidently say that you will find the narrow FOV a non-factor in your viewing pleasure.

For maximum light throughput and bright images, all TMB lens surfaces are fully multi-coated. In keeping with the no-compromise design goals of highest contrast and image sharpness, TMB eyepieces have short eye relief that may not accomodate eye glass wearers. Also, the amazing efficacy of this eyepiece is best realized with a high quality apochromat lens sytem. All TMB eyepieces are threaded for standard 1.25" size filters.

The TMB 1.8X ED barlow gives added magnification that efectively doubles the number of focal lengths available with the TMB eyepiece series. Designed specifically for the TMB eyepiece, the 1.8X barlow`s ED lens adds no color whle maintainin the high level of sharpness and high contrast that thie TMBs are famouns for. Only a few left and when they are gone, they are gone!

TMBs are quickly being phased out, due (we think) partially to their difficult and high cost manufacturing method, so when our final inventory sells out, we do not expect to be resupplied. Our present inventory, along with product specs is as follows. First come first served!


TMB Series (visual) Eyepiece Specs

Focal Length

Field of View

Eye relief

Price (Japan Yen)

TMB 4mm

30 degree

3.4mm

29,800 Yen

TMB 5mm

30 degree

4.2mm

SOLD OUT

TMB 6mm

30 degree

5.1mm

SOLD OUT

TMB 7mm

30 degree

---

SOLD OUT

TMB 8mm

30 degree

6.8mm

29,800 Yen

TMB 9mm

30 degree

---

29,800 Yen

TMB 10mm

30 degree

8.5mm

SOLD OUT

TMB 12mm

30 degree

10.2mm

SOLD OUT

TMB 14mm

30 degree

11.9mm

SOLD OUT

TMB 16mm

30 degree

13.6mm

SOLD OUT

TMB Series (visual) 1.8X ED Barlow Lens

TMB 1.8X ED Barlow

NA

NA

SOLD OUT



We ship via fast EMS Airmail to anywhere in the world!

to ship you 1 ~ 3 TMB eyepieces

Please add 1,500 Yen to your order

to ship you 4 ~ 6 TMB eyepieces

Please add 2,500 Yen to your order

to ship you 7~10 TMB eyepieces

Please add 3,500 Yen to your order

 to ship you 11+ TMB eyepieces

Please send for a quote

Payment via PayPal welcome! Our Paypal account is linked to my email address: magellan@kkohki.com

Questions, comments, concerns? Please email me (Barry Gooley)


Kokusai Kohki Original "EF-508" 8x50 CORRECT VIEW FINDER


Attractive as well as functional, the EF-508 correct view finder "Complete Set",
includes the EF-508 finder OTA, finder bracket, foot, and LED illuminator (price 18, 690 yen)


EF-508 OTA, only, includesa brightness adjustable LED illuminator (price 16,590 yen)

 

One of the world`s few "correct-view" finders, The EF-508 is an 8x50 that shows you the night sky exactly as the unaided eye sees it, that is, right side up! This makes object acquisition, aligning the sky with your star map or DSC, or just looking around, so much more natural and easier than through the typical inverted image finder.Your EF-508 comes with a robust and easily detachable finder bracket, including a foot that stays mounted to your scope`s tube. This foot attaches to Meade and Celestron SCT tube assemblies as is, with no modifications.

The EF-508 uses a superior quality pechan prism that gives bright, clear, distortion free images, far superior to the dark, lusterless images of some correct-view finders in the past. The EF-508 recticle`s center circle surrounds your object so that you know when you`ve found it, not covering it up as standard X style crosshairs tend to do. The surrounding scale is divided into 1 degree increments. A red LED recticle adjusts for brightness with a quick turn of the knob. The illuminator uses three included, and commonly available LR41 batteries.

Everything about the EF-508 could be considered "robust", including the attractive removeable finder bracket. The bracket comes free of the mounting foot that attaches to your telescope with the turn of two finger screws. Anodized aluminum rings allow for a wide range of collimation adjustment, and then hold your finder OTA tightly in place, with no loss of collimation even with multiple removals and attachments.

 

 

 

An updside down Japanese neighborhood is perhaps not be what you see thru a standard finderscope ;- ) but a left to right inverted upside down image like this is what a typical finderscope shows. Though one can get used to this, and we do, upside down (and left / right inverted) is, well, upsdide down and left / right inverted.... Compare this view with the same scene shot thru the correct view EF-508 at right.   This is more like it! The EF-508 shows us the same scene in "normal" correct view, with an easy to understand direction orientation. Object aquisition, or just making sense of what you are seeing in the night sky thru your finder also becomes correspondingly so much easier with the correct view EF-508 finder. This photo also shows the EF-508`s recticle pattern, with it`s center circle that does not cover up your object you have found. 1 degree increments are engraved on the "vertical" axis.


Brightness adjustable red LED included.

 ER-508 Correct View Finder Specs
Objective Lens Multi-coated 50mm achromat lens (actual aperture 48mm)
Eyepiece Multi-coated 8X Kelner, eye relief 18mm, with rubber eyeguard
Field of View 7 degrees (AFOV 56 degrees)
Image Erecting Prism Pechan Prism
Overall length of OTA approx 235mm
OTA OD / Color approx 55mm / WHITE (White tube color and black anodized aluminum bracket matches most telescope main OTA colors)
Total weight approx 920 grams (OTA 520 grams, bracket 400 grams)
Reticle Simple crosshair, with center circle, marked in 1 degree increments
Red LED illuminator Included, with variable brightness control / uses three LR41 batteries(included)
Focus Lens and eyepiece focus positions independently (helicoidly) adjustable
Finder Bracket Robust construction easily detaches from "foot" (which attaches to SCTs without modification) by loosening two lock screws, black anodized aluminun, 6 oversized OTA alignment bolts, overall dimensions approximately 135m x 72mm x 80mm
Complete Set Price 18,690 yen includes EF-508 OTA, finder bracket with foot, and brightness adjustable LED illuminator and batteries
OTA Price 16,590 yen EF-508 OTA, and brightness adjustable LED illuminator and batteries only, no finder bracket


We ship via fast EMS Airmail to anywhere in the world!

to ship 1 complete EF-508

Please add 3,500 Yen to your order

to ship 1 EF-508 OTA only

Please add 3,000 Yen to your order

Payment via PayPal welcome! Our Paypal account is linked to my email address: magellan@kkohki.com

Questions, comments, concerns? Please email me (Barry Gooley)

 Japanese HOME page

 English main page

 Ordering and terms

Whitey Dob Telescopes

Used items page (in Japanese)
  Specials page (in Japanese)