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William Optics RedCat 71 APO 350 is an astrograph designed for professional use, which distinguishes itself from its competitors with its exemplary field correction and excellent control of chromatic aberrations.
The heart of this telescope is the four-element Petzval APO-ED optics. Synthetic fluorite, one of the most perfect optical materials, was used for the production of the low-dispersion lens. This material, produced by the renowned Japanese company Ohara, under the designation FPL-53, is characterized not only by a high value of the Abbe number, but also much more chemically stable than natural crystalline fluorite.
This astrograph is distinguished not only by the excellent quality of the materials, but also by the technologically advanced design of the optical system. Thanks to the solutions patented by Williams Optics, this instrument offers a perfectly flat field without the need for additional equalizers.
The tube of the telescope is mounted on precisely made clamps, equipped with a Vixen socket for the mounting of a finder or guider, as well as a Vixen / Arca-Swiss foot.
Additional information is available on the manufacturer's website: https://williamoptics.com/redcat-71 • apochromatic quadruplet in the Petzval system with an air gap and a low-dispersion element made of Japanese FPL-53 glass (synthetic fluorite)
• a unique system of lenses that guarantees excellent image quality and a flat field without the need for a flattener and a focus reducer (patent from William Optics)
• large diameter full illumination wheel allowing for work with cameras and cameras equipped with full-frame matrices
• Ultra-precise, locking helical focuser
• optical tube clamps made in CNC technology
• mounting foot compatible with Vixen and Arca-Swiss sockets, allowing the tube to be mounted on a mount or photographic tripod • optical system of the telescope: APO ED quadruplet (Petzval) with an air gap
• lens arrangement: 2 - 1 - 1
• Objective diameter: 71 mm
• focal length: 348 mm
• lighted: f / 4.9
• ED lens material: FPL-53 glass (Ohara, Japan)
• circle diameter of full illumination: 45 mm
• Compatible sensor sizes: APS-C, full frame
• fokuser: helical with rotator
• camera mounting thread: M48x0.75
• finder foot: Vixen
• mounting for mounting: Vixen / Arca-Swiss
• tube length (extended): 435 mm
• tube weight (without accessories): 2.8 kg
• tube finish: red • William Optics RedCat 71 APO 350 refractor
• the pupa
• Bahtinov's mask with its mount
• a lens cap
• fixing clamps with the Vixen / Arca-Swiss foot
• transport cover 24 months
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