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2048 EUR
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price without VAT: 1665 EUR
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Askar FRA is a series of professional refractors designed for use in astrophotography, characterized by the highest optical and mechanical quality.
The Askar FRA500 500 / 5.6 APO is a high-class astrograph whose optical system consists of five lenses arranged in two groups. In order to eliminate the phenomenon of chromatic aberration, the manufacturer used in this instrument as many as two lenses made of glass with reduced dispersion, while obtaining high contrast is possible thanks to coating glass surfaces with multilayer anti-reflective coatings.
This design, both mechanically (a solid 3.5-inch extractor with a microfocus) and optically (large diameter circle full illumination) has been optimized in terms of cooperation with cameras and cameras equipped with into a full-frame matrix. • an apochromatic quintuplet with two ED glass elements
• rack & pinion with a diameter of 3.5 "allowing for alignment even with a high load
• large diameter of the full illumination wheel, as much as 55 mm, guaranteeing the coverage of the full-frame matrix • optical system: ED-APO apochromatic quintuplet with air gap
• number of ED glass elements: 2
• Objective diameter: 90 mm
• focal length of the lens: 500 mm
• lighted: f / 5.6
• anti-reflective coating: full multi-layer coating (FMC)
• Diameter of full illumination wheel: 55 mm
• back focus: 158 mm from the M48x0.75 thread on the end of the conical adapter / 86 mm from the M86x1 thread on the extractor rotator
• diameter of the lift: 3.5 "
• type of eyepiece extractor: rack & pinion with 10: 1 microfocus and the possibility of rotation by 360 °
• thread for camera or camera connection: M86x1 / M48x0.75
• mounting foot: Losmandy
• length: tubes (with unfolded diffuser): 452 mm
• length: tubes (with folded-in graft): 410 mm
• Diameter of the stems / tubes: 120/105 mm
• tube weight: 4.1 kg • Askar FRA500 500 / 5.6 APO optical tube
• fastening rings
• carrying handle
• Losmanda footer
• a conical adapter
• documentation 24 months
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