ISTAR Optical

P O Box 3985

Page AZ 86040-3985



iStar Optical - More than a Telescope Manufacturer

iStar Optical is known for the design and manufacturing of quality telescopes and lenses for individuals and the astronomy industry. No less than a half dozen professional telescope builders and manufacturers in Europe and the US now implement our lenses in their telescopes. We have produced a number of objective lenses for Universities and observatories around the world including Mount Stromlo observatory in Canberra Australia, INAF-Osservatorio Astronomico di Brera in Italy, Swarthmore College in the USA, Hohenkarpfen Observatory in Germany, Pic du Midi  observatory in France and Université Libre de Bruxelles in Belgium.

What you may not know is iStar Optical also designs and produces lenses for “Opto Mechanical” and “Opto Electronics” applications. Lenses and optical assemblies were recently produced  for the physics departments of MIT in Massachusetts USA and Caltech in Pasadena California USA. Specially designed lenses for Holographic applications were delivered to L-3 Communications EOTech in Ann Harbor Michigan USA. Recently iStar Optical became a registered supplier of optics for the prestigious STAR Labs of Lockheed Martin Aerospace and Defense Company.

Call or email today to find out how Istar Optical and their staff of engineers and opticians can provide solutions to your optical needs.


Viktor Zsohar Proudly Presents the iStar 228mm F/7.7 ATM Build

This telescope is a great performer in its class, and is a joy to use! It is awesome for observing deep-sky and fantastic for the Moon! CA? Yes, the CA is undeniably present on bright objects, but I think it is up to a person how much it is tolerated or not? For example, I could not take off my eyes off the Moon for an hour or so, even when CA was present, because I was immersed so much in observing the craters and other fine surface details! Is this telescope good? Yes, darn good :-) Actually, this refractor may be the perfect outreach kind of scope!

I am very happy with it!


The focuser is an AP 2.7" with greased rack and   pinion  and  I  added  an  AP  extension

between the focuser and the tube so that it can be exchanged later on for a 4" AP focuser if needed. The length of the system is exactly as planned. I have 7" from the end of focuser to the focal point and it comes into focus with a diagonal even for me who wears strong glasses. The 7" back focus also makes the telescope bino friendly, however, this will need to be verified. The tube mounting is a 15" AP ribbed plate with Parallax rings. The tube is not heavy considering its size. My AP 900 is good enough to hold the refractor, but I have to balance it carefully.



Whitehorse Canada


Ares WFX 150-5 R50 SLIM


Strongly Reduced Chromatic Aberration doublet

 with a near SEMI APO performance.

Istar is proud to introduce an all new, second generation Ares WFX 150mm F5

with exciting features our customers were asking for.


  The Heart of this wide field Comet Hunter is a recently designed 154mm F5 R50-Slim improved Achromatic doublet.

This new lens is substantially lighter and Chromatic aberration is reduced to near Semi APO levels with unmatched

resolution. New white tubes with all inner parts completely re-designed for reduced weight. Split construction counter cell

with fully retractable dew shield, bayonet style locking mechanism and slim lens cap held by neodymium magnets. Each OTA is

shipped with 360° fully rotatable dual speed 2.0” WO Rack and Pinion focuser in white finish and a set of 160mm “Fast Lock” Mounting

Rings. All scope parts are precision CNC machined in the European Union out of aircraft grade alloys and powder coated. All this for only $2085.



  Watch for the release of our next generation line of super lightweight 8" Refractors the Phoenix WXT 204mm F6, Perseus AXT 204mm F9 and Asteria AXT 204mm F8 R45-S.

Stay tuned!

Test Driving the Istar Perseus 150mm f/8 Achromat

Tested and Reviewed by Neil English

Over the last several years, Istar Optical has established itself as a market leader in providing high quality achromatic and semi- apochromatic refractors at fair prices. Over this length of time, I have watched the company grow and innovate in new and exciting ways, providing customers with objectives for ATM builds or complete telescopes in traditional or truss tube formats. Recently, the company has been introducing exotic glass types into their designs, thus providing large aperture with improved colour correction to sate a growing demand from the amateur community.


Having fully test driven several Istar refractors, I eventually settled on acquiring one of my own; a beautiful 127mm f/12 R30 Asteria (aka ‘Tiberius’) which has given me immense pleasure in the pursuit of my hobby. Earlier this year, Istar owner, Ales Krivanek, contacted me inquiring about whether I would be interested in test driving yet another product from their first generation stock; a 6 inch (150mm) f/8 achromat. Naturally, I obliged and the following is a summary of how I got on with it.


Fit ‘n’ Finish

The optical tube assembly arrived in perfect condition having travelled across Europe to Scotland from its source in the Czech Republic. The instrument – a first generation Istar model – was very carefully packed and a quick examination of it confirmed that all was well. Just a few moments of casual inspection of the telescope will convince you that the workmanship that went into fashioning the tube assembly is light years ahead of the more ubiquitous Synta designed CR6.


While many have complained that the original, first-generation Istar tubes were over-built and too heavy, I have come to like them an awful lot. For me, they are reassuringly sturdy and reminiscent of the days when quality achromatic refractors were being built by the world’s famous optical houses. They feel old fashioned and look old fashioned.


Like all Istar objectives I’ve had the pleasure of using, the one that accompanied this tube was perfectly assembled within its high quality, adjustable aluminium cell. The crown and flint components are properly spaced, fully-multicoated and are surrounded by a massive dew shield that protects the lens and all but guarantees hours of hassle free observing without the need for a dew band.


J.P. Brahic - French amateur astronomer


ONLY 14.5 KG

ONLY 14.5 KG

Asteria TCR 204-8 R35

Asteria TCR 204-12 R35


ONLY 17.3 KG

ONLY 14.5 KG


ATM Build by Jack, September 2014

It’s been obvious for several years that my TV85 and cheap 6 inch Dob in our Florida home consistently outperform (on the usual lineup of urban targets) my TV102 and 10 inch Dob - Newt with a premium mirror in our upstate NY home. Atmospheric and local seeing is very good most winter nights on the east central coast of FL, and poor (on those few nights when stars are visible) in NY. So I transported...




Istar Optical attended the 2nd annual Arizona Science and Astronomy Expo held in Tucson Arizona. We certainly enjoyed talking to our customers in person. It also gave us a chance to display a few of our scopes especially the new TCR (truss constructed refractors). Our very large 204mm F12 TCR drew quite a bit of attention. We also showed a prototype of our newly engineered tubes in white with retractable dew shields, better balance and lighter weight. We look forward to meeting many of our loyal and future customers in New York this spring at the annual Northeast Astronomy Forum.


ASTERIA AT 127-12 R30




ISTAR Optical

"The universe is full of magical things

patiently waiting for our wits to grow sharper."