The T-REX Alt-Azimuth mount
A dream large size alt-azimuth mount with dual axis slow motion controls and 4096 step encoders standard. Can carry up to a C-11 with no counterweights. Super smooth, rock solid, very accurate and all Made in Japan. A perfect match with DSCs. Now running loose in backyards all over the world!

Kokusai Kohki Original Correct View Finders EF-508 (8x50mm) EF-601 (10x60) Ef-508 Converson Lens EF-60 Our 8th production run of the EF-508 correct view finder adds the new and larger aperture EF-601 to the product lineup. In addition, a replacement lens for the EF-508, dubbed EF-60, makes upgrading the EF-508 to an EF-601 a simple switch of the objective lens. The EF-508 and EF-601 come in a white tube, and are both avaialable in set with our own original design and manufacture finder bracket. A third set that also includes the Baader Planetarium "Standard Bracket" foot, which will mate your finder to most any OD tube with an OD of about a 144mm to 250 mm. For tube ODs larger and smaller than these, the use of a small spacer or shim between the Standard Bracket and tube should easily allow for a decent fit. The EF-508 / EF-601 use a very well made pechan prism internally, to right the upside down image coming from the objective lens. This prism gives surprisingly clear and bright views and in no way feels inferior to the image seen thru a typical upside down finder of the same aperature. An X type reticle, marked in 1 degree increments, uses a center bubble for putting your object of interest in the center of the FOV, without covering it up. A brightness adjustable red LED that illuminates the reticle is standard with your EF-508 / 601. EF-601 (left) and EF-508 (right) in combination with the Baader Planetarium "standard bracket". The EF-508/601 finders are also available as an optical tube by itself. Our original design finder bracket is compatible with either size finder, and a variable brightness red LED illuminator is standard equipment. Though optically of significantly high quality, the correct view EF-508/601`s greatest claim to fame, is, well, its correct view image. Objects appear in correct up/down/left/right orientation, as if viewing them either with the naked eye, a binocular or a spotting scope.This makes correlating stellar patterns in the FOV with your star chart a snap. And reading far away billboards, street signs, etc is a breeze (no more having to stand on your head ;- ) Each EF-508/601 is personally inspected before shipment and is accurately focused. Of course everyone has their own focus preferences, and you can easily adjust the infinity focus, and reticle focus with some quick turns of the adjustment rings. To help deliver the brightest possible images, all optical surfaces are fully multi-coated. The red LED unit is delivered with two LR-41 button batteries that are easily sourced where-ever batteries are sold. The EF-508/601 are robust optics, and slightly heavier than a standard finderscope of the same aperture. We have seen very few problems over the years with the sale of over 3000 units worldwide to date (though almost all in Japan). Our finder bracket will also mate with a Vixen saddle plate, either separately (588 yen) or with the same on your Vixen telescope. Our finder bracket uses oversize plastic tipped 5mm aluminum adjustment bolts to secure the finder without scratching the optical tube. The EF-508 correct view finder is made in China for us to our specifications, and each unit is inspected for quality here in Japan before we ship. We market and warrant our finders on the condition that you either LOVE your EF-508/601 or you get your money back! We now offer the optional "EF-60" objective lens assembly, that lets you upgrade your EF-508 to an EF-601 with a simple replacement of the lens. Your upgraded EF-601 uses the same finder bracket and illuminator, and focuses at about the same point. See A LOT more stars with the added aperature! Correct View EF-508 / EF-601 / EF-60 Specs EF-508 Optics 8x50mm / achromat lens / Kelner eyepiece / effective aperture 48mm/ apparent FOV 56 degrees / actual FOV 7 degrees EF-601 Optics 10x60mm / achromat lens / Kelner eyepiece / effective aperture 59.8mm/ apparent FOV 56 degrees / actual FOV 5.6 degrees EF60 Optics 10x60mm / achromat lense / effective aperture 59.8mm Coatings Fully multi-coated EDF-508/601 Prism Uses one pechan prism internally EDF-508/601 Eye relief approx 18mm EDF-508/601 Dimensions approx 55mm x 235mm / approx 55mm x 262mm EDF-508/601 Weight Approx 520 grams / approx 600 grams Tube Colors available White only LED uses LR-41 button battery x 2 pc (included) Reticle pattern X shape, scaled in 1 degree increments: pattern Misc Infinity focus and reticle focus uses helicoid focus rings. Download manual here for more photos and details, please see our Japanese language page Pricing part # EF-508 / 601 / EF-60 Price ef5081w EF-508 OTA only, with LED illuminator, no bracket / color WHITE 12,800 Yen ef5082W EF-508 OTA with Vixen compatible finder bracket and LED illuminator / OTA color WHITE (Baader "standard bracket" NOT included) 14,800 Yen ef5082FS EF-508 OTA with Vixen compatible finder bracket, Baader "standard bracket" and LED illuminator / OTA color WHITE 16,800 Yen ef601w EF-601 OTA only, with LED illuminator, no bracket / color WHITE 19,800 Yen ef601WV EF-601 OTA with Vixen compatible finder bracket and LED illuminator / OTA color WHITE (Baader "standard bracket" NOT included) 21,800 Yen ef601FS EF-601 OTA with Vixen compatible finder bracket, Baader "standard bracket" and LED illuminator / OTA color WHITE 23,800 Yen ef60 60mm objective lens assembly, with cell, specifically for EF-508 easy conversion to EF-601 8,800 Yen PARTS 508V Vixen finder bracket for EF-508 (compatible with Vixen saddle / (Baader "standard bracket" NOT included) 6,090 Yen 2457000 Baader "standard bracket" saddle plate for 508V 4,800 Yen 2654-04 Vixen saddle plate, white only photo 588 Yen 508S (spare) LED illuminator only, for EF-508, with two LR-41 button batteries photo 2,980 Yen We ship via fast EMS Airmail to anywhere in the world! to ship one EF60, EF-508/601 OTA or OTA + finder bracket set Please add 2,000 Yen to your order for additional finders Fee varies according to destination. Please request a quote For currency conversion (OANDA) click here Payment via PayPal welcome! Our Paypal account is linked to this email address: magellan@kkohki.com    Accessories For Vixen PORTA / PORTA II Slewing Handle : "New Guide Handle" Carry Bag : "PORTA Bag" The Vixen PORTA, and newest model PORTA II alt-azimuth mounts, have taken Japan by storm and I hear that they are hot sellers all over the world. And no wonder; the PORTA mount carries a decent payload up to about 5~6, maybe 7Kg, OTAs attach easily to it with the now nearly universal Vixen dovetail plate, it has competent dual axis slow motion handles, and comes complete with a very decent height adjustable aluminum tripod, all for a quite reasonable price. And it`s rather pretty too. But we did notice one aspect of the PORTA mount that, in use, sometimes proves to be amazingly annoying ..... Aiming your PORTA mounted OTA around the sky usually means grabbing the focuser or star diagonal and then using this "handle" to point your scope. This often results in twisting the star diagonal out of alignment, getting gear grease on fingers or even having the star diagonal+eyepiece combination fall off onto the hard ground below....Yikes! At any rate, the usual method is, oh, so, well,... inelegant....And perhaps not very accurate either. And certainly not convenient.... Instead of grabbing and then man-handling the focuser, the simple addition of a robust handle to the altitude axis of the PORTA removes all this lack of finesse with a quick and easy installation. Our own "New Guide Handle", designed specifically for use on both PORTA mounts, has a foam covered grip on the end that keeps fingers warm, and lets you become the true master of your trusty PORTA mount ;-) "New Guide Handle", for both PORTA and PORTA II mounts, attaches in about 5 easy minutes, and the necessary tools are included with your PORTA mount as it comes from Vixen. Attachment involves removing the dovetail saddle plate on the altitude axis, slipping it over the New Guide Handle, then rebolting the combination back on to the altitude axis, a very simple procedure that is also kinda fun to perform. Highly recommended for all PORTA users!! 1) Gather your implements from under the rubber cover of your PORTA`s azimuth axis 2) Use this hex wrench to loosen the screws attaching the saddle plate to the altitude axis. 3) Get your New Guide Handle in hand, along with the included attachment screws. 4) Line up the holes in the saddle plate with the New Guide Handle and insert the screws 5) With the same hex wrench, screw the saddle plate, with the New Guide Handle sandwiched between it and the mount, back onto the altitude axis 6) Installation completed in 5 minutes or less! Make pointing of your PORTA easy, intuitive, accurate and for the first time, elegant! The PORTA Bag For both PORTA and PORTA II mounts, we also offer a PORTA specific carry bag that perfectly conforms to the hump of the alt-azimuth head assembly, and includes an inner pocket for holding the plastic parts tray from between the tripod legs. Rugged materials and strong zippers will keep your PORTA safe for a lifetime and it sure makes transporting and storing your PORTA mount a cinch. One of our most popular items in the Japanese market, this carry bag can also contain other makers` tripods or even complete telescope OTAs like a TAK FC125 (without removing the finder). PORTA BAG Internal pocket for the parts tray PORTA mount inside   Part #   Part Name   Price nhg New Guide Handle for PORTA/PORTA II 4,800 yen bag-porta Carry bag for PORTA/PORTA II 6,800 yen for more photos and details, please see our Japanese language page We ship via fast EMS Airmail to anywhere in the world! to ship 1 New Guide handle Please add 1,000 Yen to your order to ship 1 Carry Bag Please add 2,000 Yen to your order For currency conversion (OANDA) click here Payment via PayPal welcome! Our Paypal account is linked to this email address: magellan@kkohki.com Sorry, no shopping basket... For orders and inquiries Please email me   NIKON HYPER WIDE NAV HW Eyepieces Riding the wave of their international success with the NAV-SW series eyepieces, Nikon now offers the new hyper wide 102 degee FOV NAV-HW series eyepieces. This series consists of two focal lengths, the 12.5mm NAV-12.5HW and the 17mm NAV-17HW. Each eyepiece also includes, at no charge!, the unique benefit of an "EiC" tele-extender lens, specifically designed for each eyepiece, that shortens the focal length to 10mm in the case of the NAV-12.5HW, and the NAV-17HW to 14mm. Which means you are actually getting two eyepieces for the price of one. The NAV-12.5HW is a 1.25" eyepiece that includes a 2" screw on barrrel. The NAV-17HW is a dedicated 2" eyepiece. All surfaces are multi-coated with world class Nikon coatings and the mechanical and cosmetic finish is, well, perfect, as you would expect with any Nikon product. Either eyepiece is delivered in a big package, making airmail shipping rates are a bit on the high side. But I am sure you will find your Nikon HW to be a superb addition to your eyepiece case and your pride and joy as you train it on the night skies. Available from Nikon in 2~3 days from your order. NIKON NAV HW Series (visual) Eyepiece Specs Item f/l Field of View Eye relief Lens Design Size (mm) Barrel Size Weight (gram) Price (Japan Yen) NAV 12.5 HW 12.5mm 102 degree 16mm 7 group / 10 lens 64 x 151 1.25" & 2" 670 99,800 Yen NAV 12.5 HW with EiC-10 10mm 102 degree 16mm 8 group / 12 lens 64 x 170 1.25" & 2" 690 EiC-10 included free with your NAV 12.5HW! NAV 17 HW 17mm 102 degree 16mm 7 group / 10 lens 64 x 157 2" only 950 99,800 Yen NAV 17 HW with EiC-14 14mm 102 degree 16mm 8 group / 12 lens 64 x 167 2" only 990 EiC-14 included free with your NAV 17HW! We ship via fast EMS Airmail to anywhere in the world! to ship one NAV HW eyepiece Please add 5,000 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 cart... For orders and inquiries Please email me   NIKON NAV SW Eyepieces Hot off their optical benches, Nikon commemorated the International Year of Astronomy 2009 with the birth of their brand new and long awaited NAV-SW series eyepieces. Manufactured in five different focal lengths, all are now currently available and shippng from order Nikon NAV SWs, based on their excellent eyepieces for Nikon spotting scopes, have evolved to meet the requirements of high level astronomical observation, with the deepest attention devoted to exquisite rendition of astronomical point sources of light, while also taking a chapter for the digiscope design world, which demands flat fields and sharp images right to the very edge of the field of view. The NAV SW design emphasizes suppresion of field curvature and all astigmatism to bring about the maximum improvement in edge of field fidelity wthout sacrificing the quality of the image at the central of field. The compact Nikon NAV SWs are 72 degree FOV eyepieces that come with 1.25" barrels that are threaded for standard filters. The comfortable eye relief specs for each eyepiece are designed to also harmonize with the optical performance of that eyepiece. Also, removal of exit pupil aberrations virtually eliminates any instance of kidney bean blackout effect, regardless of where the eye is placed during observation. The excellent color balance of the NAV SWs was derived through rigorous testing of this optical parameter on terrestrial objects, insuring the highest degree of planetary and lunar color rendition. Multicoatings on every optical surface make sure that these images are also as bright and otherwise distortion free as possible. The Nikon NAV SW exterior design is somewhat reminiscent of the tried and true Nikkor lens design, with an attractive, high quality appearance, and rollets located around the entire circumference making the eyepieces easy and sure to grip even in darkness, or with gloved hands. A flexible silicone rubber eye shield on the top of the eyepiece helps block streets lights and other annoying sources of light pollution, especially a help when viewing sensitive planetary and lunar surface details at high magnifications. The rubber eyeguard is painted with a unique phosphorescent logo that glows ever so slightly to help make seeing the eyepieces (or finding them) in the dark just a little easier. Nikon NAV SWs moisture resistant design will provide long years of constant and worry free service and viewing pleasure to discriminating astronomers in any observing environment worldwide. The combination of the ideal optical qualities of a flat and wide 72 degree FOV that is sharp from edge to edge, excellent color rendition, comfortable eye relief intelligently designed to harmonzie specifically with each eyepiece, a beautiful and compact body design, highest quality Japanese glass, multi-coatings and exterior materials, and a good selection of focal lengths, makes the Nikon NAV SWs a true and new winner in the ever expanding world of 21 century astronomy. NIKON NAV SW Series (visual) Eyepiece Specs Item f/l Field of View Eye relief Lens Design Size (mm) Weight (gram) Price (Japan Yen) NAV 5SW 5mm 72 degree 18mm 6 group / 8 lens 56.5 x 91 300 37,900 Yen NAV 7SW 7mm 72 degree 17mm 6 group / 8 lens 56.5 x 78 290 37,900 Yen NAV 10SW 10mm 72 degree 19mm 6 group / 8 lens 56.5 x 79 300 37,900 Yen NAV 14SW 14mm 72 degree 18mm 5 group / 7 lens 56.5 x 77.5 275 37,900 Yen NAV 17.5SW 17.5mm 72 degree 26mm 5 group / 8 lens 56.5 x 94.5 365 42,900 Yen EiC-16 converter lens Specifically optimized for Nikon NAV SWs, the EiC-16 provides a 1.6X tele-extension for the NAV SWs, with even more enhanced field curvature and astigamitism suppresion. Can also be used with other makers` eyepieces, 1.25" size 21,000 Yen Nikon NAV 10SW and EiC-6 in stock and shipping We ship via fast EMS Airmail to anywhere in the world! to ship one NAV SW eyepiece Please add 2,000 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 cart... For orders and inquiries Please email me click each for larger image      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 Kokusai Kohki offers the fabulous Pentax XO and XW series wide angle SMC (super multi-coated) 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 34,400 Yen XW5mm 70 degree 20mm 5 group / 8 lens 6.2 61 x 127 395 31,200 Yen XW7mm 70 degree 20mm 6 group / 8 lens 8.8 61 x 120 390 31,200 Yen XW10mm 70 degree 20mm 6 group / 7 lens 12.4 61 x 110 390 31,200 Yen XW14mm 70 degree 20mm 6 group / 7 lens 17.6 61 x 97 365 31,200 Yen XW20mm 70 degree 20mm 4 group / 6 lens 24.0 61 x 86 355 31,200 Yen XW30mm 70 degree 20mm 6 group / 7 lens 36.2 76 x 123 740 SOLD OUT XW40mm 70 degree 20mm 5 group / 6 lens 46.5 76 x 117 700 SOLD OUT   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 SOLD OUT XO 5mm    44 degree 3.6mm 3 group / 5 lens   37 x 45 90 SOLD OUT    Pentax XP Series (eyepiece projection only) Eyepiece Specs XP 24mm N / A N / A 5 group / 6 lens   30 x 69 70 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 16,800 Yen  XF 12mm 60 degree 18mm 4 group / 6 lens   43 x 78 150 16,800 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 2,000 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 cart... For orders and inquiries Please email me To Page Top 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 your eyepieces individually protected, probably 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 precious eyepieces inside!). These bolt cases probably have a thousand other uses as well. How about using them to store nuts and bolts, coins, gold dust, trail mix or even your favorite coffee beans.... ; - )     Part #   Part Name   Inside dimensions   Price NEC0 Screw on Bolt Case "Small"  40mm x    80mm 280 yen NEC2 Screw on Bolt Case "Medium"  48mm x   102mm 380 yen NEC1 Screw on Bolt Case "Large"  64mm x   115mm 580 yen For currency conversion (OANDA) click here Payment via PayPal welcome! Our Paypal account is linked to this email address: magellan@kkohki.com Sorry, no shopping basket... For orders and inquiries Please email me To Page Top  Japanese HOME page  English main page  Ordering and terms Used items page (in Japanese)   Specials page (in Japanese)