Parallax PI320 - 12.5" f/6 Newtonian Reflector OTA

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Parallax PI320 - 12.5" f/6 Newtonian Reflector OTA

Parallax Instruments 12.5" PI320 Newtonian Reflector Telescope

Many astronomers have contacted Parallax over the years complaining that their apochromatic refractors, although providing sharp, crisp images, just don't show them the ultra fine detail on Jupiter that they saw through a 12.5" Newtonian at a star party. Parallax Instruments answer to them has been simply that there is no secret here. As Dawes limit suggests, only the larger aperture can resolve the finest filamentary structures on a planetary disc.

The 12.5" PI320 and the 16" PI400 round out Parallax Instruments line of large aperture, high performance telescopes. These research grade instruments, due to their enormous light gathering and resolving power are capable of both deep sky and planetary performance only dreamed of and represent the ultimate in a personal telescope. All models carry a focal ratio of F/6, yielding a generous image scale while remaining relatively manageable in physical size. Unparalleled optics, very special optimizing techniques, and the highest quality components are employed throughout. Enhanced aluminum coatings for the Parallax Instruments 12.5" PI320 Newtonian Reflector Telescope are available for an additional $170. (See "Accessories" tab to the left.)

All optical tubes are finished in high gloss acrylic urethane paint and are furnished with metal snap-lock dust cover and 2" and 1 1/4" focuser adapters. Diagonals or eyepieces are not included. Interferometric test report and fringe analysis data is included with each telescope.

The primary mirror cells of the 12.5" & 16" instruments are provided with a cooling fan as standard equipment. Energizing the cooling fan before an observing session ensures more rapid thermal equalization of the primary mirror to the outside ambient temperature. In fact, Parallax Instruments recommends that the fan be run continuously while observing. The resulting laminar airflow significantly reduces the effects of tube currents early in an observing session.

Although large in aperture, the 12.5" telescope, weighing in at 70 Lbs., may still be handled by one person due to its entirely aluminum construction. The 16" telescope is designed primarily for installation in a personal observatory and is also well suited for schools or universities. Parallax Instruments optional HD200 Equatorial mount is perfectly suited to handle these large telescopes.

Parallax Instruments Product Number: PI320

Customer Note: There is an approximate 4- 6 month lead time and orders require a 50% deposit - price does not include shipping charges. Once your order is placed, OPT will contact you with availability dates and shipping charges. All prices are subject to change without prior notice.


Aperture318 mm (12.5")
Exterior ColorGloss White
Focal Ratiof/6
Highest Useful MagnificationNot supplied by manufacturer
Limiting Stellar Magnitude15
Optical DesignNewtonian
OTA Outer Diameter380mm
OTA Weight70 lbs.
Telescope SeriesParallax Newtonian
WarrantyNot Supplied By Manufacturer