Now introducing the NEW William Optics Star 71R&P!!!
This scope is ultimately designed for astronomers who want the best results in photographic/CCD imaging. The WO-Star71 imaging telescope provides pinpoint stars at the very edge of a 45mm imaging circle.
Key Features 71mm f/4.9 Imaging Refractor Telescope.FPL-53 glass for color free apochromatic performance. 5 elements in 3 groups (3-1-1- configuration; new, unique, patented design - not a conventional objective/flattener/reducer design) . Covers 45mm full frame imaging circle. 2.5" dual speed R&P focuser. Includes mounting rings and Vixen style dovetail. Weight = 4.5 lbs / 2.05 kg (OTA only) ; 5.3 lbs / 2.4 kg (OTA with rings and dovetail) . Focuser drawtube travel = 1.38" / 35mm.
Additional Information Focuser drawtube terminates in a male M48 thread. Telescope comes with a wide M48-Canon EOS adapter ring. Similar rings are available from other supplier for other brands of cameras. Not a conventional 2" focuser tube with locking thumbscrews.. Optional 1.25" 90-deg dielectric mirror diagonal sold separately for those wishing to use this as a visual. This diagonal comes with a custom adapter that connects directly to the M65 female thread on the telescope's focuser tube; you cannot use standard 1.25" diagonals. Telescope cannot reach focus with larger 2" diagonals. Optional soft carry case available separately.
|Focal Ratio ||F/4.9|
|Focal Length ||350.2 mm|
|Objective Type ||5 elements in 3 groups (3-1-1- configuration; new, unique, patented design) |
|Lens Shade ||Retractable|
|R&P Focuser || 2.5" dual speed R&P focuser |
Focuser drawtube travel = 1.38" / 35mm
|Type of Mount || Includes mounting rings and Vixen style dovetail |
|Tube Weight||Weight = 4.5 lbs / 2.05 kg (OTA only); 5.3 lbs / 2.4 kg (OTA with rings and dovetail)|
Specification for Apochromatic Lenses
All WO refractors objective are double tested and inspected before shipping to our customer, these telescopes are free of coma and astigmatism.
Since all individual lens surfaces are machine coated sometime it could have visual imperfections which do not affect the objective optical performance.
Dimensions of scratches and points shall not exceed the following values:
Surface finish class Scratches Points Accumulation of defects Width,not more, mm Total length, not more, mm, Diameter no more,mm, Quantity, no more Diameter.
|Scratches||Width, not more, mm||0.025mm|
|Total length, not more||1/4 of total lens diameter. |
Quantity no more 3
|Dots or spot points||No more, mm||0.4mm|
|Quantity, no more||3|
|Accumulation of defects||Limited area, mm||0.8mm^2|
|Total area of scratches and points, no more, square mm||5.8mm^2|