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Gran Turismo (GT) 81 APO is an air-spaced Triplet FPL-53 Apochromatic with ED flattener refractor.
F5.9 lens has a heart of super low dispersion glass that reduces any secondary spectrum to an unbelievable degree. This package includes guiding rings.
|Resolving Power||1.43 second of arc|
|Objective Type||Five element with FPL-53 Air Spaced (2 groups), Fully Multi-Coated, STM coatings|
|Lens Shade||Retractable with locking screw|
2" 360° Rotating Camera-angle Adjuster, 1:10 fine focus
Travel Length 3.15" (80 mm)
2" Brass Compression Ring
|View Finder & Handle||Illuminating V Shape-|
|1.25" Adapter||Brass Compression Ring Included|
|Tube Length||(440 mm) Fully Retracted
(484 mm) Fully Extended
|Tube Weight||8 lbs.( 3.7kg)|
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
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|
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