The Opticstar ARC-90 is a 90mm aperture F/10 achromatic refractor that is ideal for planetary,
Lunar and Solar observing with an appropriate Solar filter. The ARC-90 uses an air-spaced
achromatic doublet delivering high magnifications for its aperture. The scope can also be used
for high power terrestrial observation with an optional prism diagonal.
The ARC-90 uses an anti-reflection coated doublet objective lens for increased image contrast
and sharpness. The long focal ratio restrains chromatic and other optical aberrations making
the telescope well suited for observation at higher powers.
The optical tube has been internally anti-reflection coated and benefits from knife-edge baffles
that prevent stray light from reaching the focal plane thus increasing image contrast and sharpness.
To further increase image quality, the optical tube assembly has a dew shield that also protects
the lenses from condensation forming on the objective when the telescope is used in unfavourable
The telescope's rack & pinion focuser will accept standard 1.25" astronomical accessories
including diagonals, eyepieces, barlows etc. The telescope has a Vixen/Sky-Watcher type dovetail
and will mount on most astronomical mounts including the Opticstar EQ700 and EQ1300 GOTO (coming soon).
The ARC-90 comes with a 6x30mm finder scope and bracket, 1.25" star diagonal, and a 25mm
eyepiece. A Moon filter and additional eyepieces are optional. A 25% transparency Moon filter is
recommended as is a 5mm-6mm eyepiece for high power viewing.
Customers who purchase any Opticstar telescopes, Opticstar optical tubes or
Opticstar mounts listed on this page qualify for a 10% cash back
on any Opticstar astronomy cameras purchased at the same time or at a later date.
This offer is valid for 1 year commencing on the date that the Opticstar
product is purchased from the Opticstar website or the Opticstar showroom.
Any additional purchases at a later date of Opticstar products that qualify for
this offer will renew the cash back period to 1 full year.
Opticstar astronomy cameras that qualify for this offer include the following:
Once an Opticstar CCD or CMOS camera has been purchased within a year of
the qualifying Opticstar purchase, the cash back can be claimed by contacting
Opticstar by email or over the phone quoting the receipt number(s). Please
allow up to 14 days to process the payment.
The A&M 80mm f/6 A&M/TMB has been
reviewed in Cloudy Nights
and it has been hailed as the "best of breed". The review concludes by saying "offers
stunning performance while standing out from the crowd, look no further".