Появились большеапертурные телескопы - 60 см и даже 80-см. Лёша, что скажешь про телескоп?
60-см f/3.8 стоит $57,495.00
http://www.optcorp.com/product.aspx?pid=1-600-1655-1993-17597Officina Stellare RiLA 600mm f/3.8 Astrograph Telescope OTA
The Officina Stellare RiLA Astrograph is a fast focal ratio astrograph telescope which provides a very wide corrected field.
The system is crafted with an aspherical primary mirror, a spherical secondary mirror and a lens group in the back.
The Officina Stellare RiLA Astrograph is corrected in the visible-near IR range, with more than 80% of energy focused in 4-6 microns RMS spot.
This product number is for the optical tube only.
Officina Stellare RiLA Astrograph
The Riccardi Large Astrograph, RiLA, is the first of its kind thanks to the review of Italian optical designer, Massimo Riccardi. This modern, new optical design comes from a modification of the Harmer-Wynne scheme. The system is made by an aspherical primary mirror, a spherical secondary mirror and a lens group in the back. The RiLA is corrected in the visible-near IR range, with more than 80% of energy focused in 4-6 microns RMS spot! Like the Riccardi Honders scheme, the telescope results in a very compact and lightweight system. The main goal of the RiLA is to cover a very wide corrected field with a fast F ratio.
Standard configuration: Zero expansion carbon truss tube design, four Losmandy type dovetails, three ventilation fans, mirrors heating, TC-1 controller, shroud and cap covers. Main optional accessories: Digital focusers, finderscope, additional dovetail bars, customized imaging train parts.
Officina Stellare RiLA Astrograph Features...
Optical set: RiLA, two mirrors and back lens group
Clear aperture: 400, 600 and 800 mm
Focal ratio: F/3.8 (400 mm), F/3.7 (600, 800 mm)
Corrected field: 60 mm (400 mm), 90 mm (600, 800 mm)
Spot Size inside full circle: 4 to 6 microns RMS
Weight: 41 Kg/90.4 Lbs (400 mm)
Length: 875 mm/34.5” (400 mm)
Max outside diameter: 590 mm/23.2” (400 mm)