Last Update: 2014-04-18

ISTAR Optical, PO Box 3985, Page AZ, 86040-3985, USA

LONG FOCUS ACHROMATS vs. SHORT FOCUS APOCHROMATS

A shootout by Neil English

ARIZONA SCIENCE & ASTRONOMY EXPO

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.

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SCAE SHOW 2013

 

For nine years Craig Weatherwax and the gang at OPT Telescopes have put on the Southern California Astronomy Expo (SCAE) in Oceanside California. OPT has the perfect setup to host such an event. Two levels of vendors set up outside in cool summer temperatures. A large conference room is located on the first floor of the OPT complex to accommodate quest speakers and their audiences throughout the day. A great selection of telescopes and accessories are displayed by dealers and manufacturers. Popular names like Plainwave, Televue, Daystar, Meade, Celestron, Optronics, Optec, QSI and of course Istar Optical line the two levels in tents.

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Asteria TCR 204-12 R35

COMPLETE OTA

ONLY 17.3 KG

ONLY 17.3 KG 

Stranger than Fiction!

 

Abstract

 

This paper has compared and contrasted the optical properties of two refractors; a 4” F/6.3 doublet apochromat and a 4” F/15 Fraunhofer achromat, of classical design. The remit of the study was initially broader, including triplet apochromats, but this class of telescope was omitted from consideration, as the findings were broadly similar to those of doublets.

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COMPLETE OTA

ONLY 14.5 KG

ONLY 14.5 KG 

Asteria TCR 204-8 R35

ASTERIA AT 127-12 R30

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NEIL ENGLISH

by

ISTAR Optical

"The universe is full of magical things

patiently waiting for our wits to grow sharper."

Eden Phillpotts