About the Istar Perseus AT 204-9 F/8.8 Achromatic Doublet Refractor Telescope...
Unlike so many mass-produced telescopes on the market today, refractors like the Istar Perseus AT 204-9 F/8.8 Refractor Telescope from Istar Optical are created one at a time and then strenuously tested to insure the best quality possible. The Istar Optical Refractor Telescope optics are manufactured with glass from brand name companies like O''Hara, Schott, and CDGM.
Each Istar Optical Refractor Telescope Lens is produced with a super flat black-edge masking that eliminates unwanted inner objective glass reflections while improving on resolution. Once completed, all IStar lenses, such as those incorporated into the Istar Perseus AT 204-9 F/8.8 Refractor Telescope, are tested twice. A computer interferometer test is done as well as a full visual test out under the stars. Every Istar Optical Refractor Telescope Lens is engraved with its own serial number, and that number is linked to its set of reports, which are sent to the buyer along with warranty information (5 years).
A special lens cap, like the one included with the Istar Perseus AT 204-9 F/8.8 Refractor Telescope, is shipped with each Istar Optical Refractor Telescope that will allow the user to increase or decrease the friction inside of the dew shield by simply loosening or tightening two silver bolts. It is unlike anything else on the market today.
The Istar Optical Refractor Telescope optical tube assembly and dew shield for each iStar telescope, like the Istar Perseus AT 204-9 F/8.8 Refractor Telescope, are produced in Austria and then CNC machined and powder coated in the Czech Republic. The finish of choice is matte black. The textured finish is durable and allows for a sure grip when handling the Istar Optical Refractor Telescope tube.
Finally, Istar provides a 2.5" dual speed, 360 degree rotatable focuser to finish off your Istar Perseus AT 204-9 F/8.8 Refractor Telescope in style. The focuser is CNC machined of aircraft grade alloy, and the included 2" & 1.25" adapters have brass compression rings. The draw tube travel is 4.5", and the whole Istar Optical Refractor Telescope weighs 3.2 lbs.
Istar Perseus AT 204-9 F/8.8 Achromatic Doublet Refractor Telescope Features...
- The Istar Optical Perseus AT 204-9 F/8.8 Refractor OTA is an Achromatic Doublet.
- The two element design features full multi-coatings.
- The Istar Optical Perseus AT 204-9 F/8.8 Refractor OTA has a lens diameter of 210mm with a full 8" of clear aperture.
- Longer focal ratio of f/8.8 and focal length of 1800mm.
- Istar refractors come with a 2.5" dual speed, fully rotatable Crayford focuser and includes 2" & 1.25" brass compression adapter and tube rings
Istar Perseus AT 204-9 F/8.8 Achromatic Refractor Telescope Specifications...
Number of Elements: 2
Lens Diameter: 210 mm
Clear Aperture: 204 mm (8")
Focal Length: 1800 mm
Lens Coating: Fully Multi-Coated
OTA Weight: 20.5 Kg (45.1 Lb)
OTA Length: 1639 mmIstar Product Number: ISAT204-9