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Specifications
• Aperture 70mm
• Focal ratio f6.2
• Focal length 430mm
• Objective type - Doublet air spaced Doublet FPL51 ED Glass, Fully multicoated
• Resolving power - 1.6 seconds of arc
• Lens shade - retractable type
• Focuser - Crayford Dual speed 2 inch - 360 Degree rotating, 1:10 Dual Speed fine focus, Focus travel 81mm (3.1 inches) including 1.25 inch adaptor
• 1.25 inch adaptor including brass compression rings (for no marking of eyepiece barrel)
• L Type mounting bracket connected to bottom of tube, standard tripod connectable (removable)
• Tube diameter 90mm
• Tube length 430mm (16.9 inches) fully retracted, 500mm (17.9 inches) fully extended

Features:
The latest William Optics Zenithstar Doublet APO is a 70mm ED refractor ideal for everyone who needs an excellent high portability astrophotographic scope/ back-up scope/ guiding scope at a sensational price.

Lens Design
• Doublet ED, using premimum Ohara FPL-51 Japanese glass, air spaced, in CNC machined ultra high precision lens cell
• Each lens is Fully Multi-Coated with best in classanti-reflective coatings

Low light scatter
• Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast
• 70 mm clear aperture

Nothing Left to Chance
• Fully CNC machined production, no plastic part used
• Drawtube travel length 81 mm, with precision graduated scale
• 1.25” adapter included
• Brass Compression rings on the adapter: will not ruin your precious eyepieces

Super Portable
• Retractable dewshield, for enhanced transportability
• Optional rings, guiding rings and 0.8x field flattener/reducer are available

Beautiful Anodizing
• Superior anodizing will not only give you a beautiful telescope, but also protect it by making the surface much harder than natural aluminum
• Traditional white tube colour, stippled finish, just like premium refractrors should be - particularly suited to be paired to SCTs as a guiding scope

Wonderful William Optics microfocuser
• William Optics 360-degree rotatable Crayford focuser, smooth and precise
• Adjustable focuser tension
• Super-smooth and reliable 1:10 micro focuser for fine focusing during astrophotography or visual observations alike

Attention to Packaging
• Aircraft carry-on size: you do not have to leave your treasure home
• Two-year, no fuss warranty and constant customer service

Report on this telescope:
Please see the following web details for a review of this sensational refractor by Steve Cox
http://sfaaa.com/articles/product-rewiews/54-product-reviews/159-william-optics-zenithstar-70ed-review