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William Optics ZenithStar 70 APO

William Optics ZenithStar 70 APO

ED glass (Japanese Ohara glass, FPL51) doublet air-spaced, in Read more

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Lens Design
ED glass (Japanese Ohara glass, FPL51) doublet air-spaced, in CNC machined ultra-high precision lens cell.Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
Low C.A.
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
Perfect for EAZY-T Alt-Az Mount. You can slide it directly into the mount without a dovetail plate if you like.Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tubeDrawtube travel length 81 mm with graduated scale.Retractable dewshield, smallest size ever and enhanced portability!
Astrophotography super-apo
Fast focal ratio for bright, high-quality astro-imaging.Dedicated field reducer/flattener available.Perfect for piggybacking as a guide scope. Consider our new guiding rings!
Wonderful WO Microfocuser
William Optics rotatable Crayford focuser, smooth and precise, ideal during astrophotography.Adjustable focuser tension.Super-smooth and reliable 1:10 micro focuser for fine focusing during imaging and visual observations alike.
Attention to Packaging
The basic package includes the OTA only.An optional white ABS backpack type carry case with internal softcase is available.Carry-on size: you do not have to leave this treasure home!Two-year, no fuss warranty and constant customer service!
70 mm
Focal Ratio
Focal Length
430 mm
Objective Type
Fully Multi-Coated, transparent coatings
Resolving Power
Lens Shade
50.8 mm (2") Crayford Focuser
1.25" Adapter
Tube Diameter
Integrated L-Bracket
Release Date
First seen
16 December 2008