About the William Optics ZenithStar 71 ED Doublet APO Refractor Telescope w/ Field Flattener 6...
Looking for a small-aperture but extremely-portable APO scope at a great price? The latest William Optics ZenithStar 71 ED Doublet APO Refractor Telescope is here to fit all your needs!
Excellent mechanics, fit and finish, latest WO 2" Rack & Pinion 2-speed fine focuser now are so good that they can replicate the smoothness and lack of backlash normally associated with a Crayford focuser, but with the huge advantage of much increased mechanical strength. When you choose a William Optics ZenithStar 71 ED Doublet APO Refractor Telescope, this is what you can expect...
-ED glass (Japanese imported Ohara glass) 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.
-Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast.
-71 mm clear aperture and F/5.9 focal ratio.
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 tube
-Drawtube travel length 80 mm with graduated scale.
-Retractable dewshield, smallest size ever and enhanced portability!
-Can mount a WO 2" star diagonal and other 2" accessories.
-Fast focal ratio for bright, high-quality astro-imaging.
-Includes New Flattener 6.
-Perfect for piggybacking as a guide scope!
Wonderful WO Microfocuser
-William Optics new rotatable Rack & Pinion focuser, smooth and precise, ideal during astrophotography; can be fully locked and will not flex or slip even with a very heavy camera combination.
-Adjustable focuser tension.
-Super-smooth and reliable 1:10 micro focuser for fine focusing during imaging and visual observations alike.
-Aluminum fine knob protection cover is included.
Attention to Packaging
-The basic package includes the OTA only.
-Carry-on size: you do not have to leave this treasure home!
-Two-year, no fuss warranty and constant customer service!
But don''t stop there. This William Optics ZenithStar 71 APO Refractor Telescope also includes Field Flattener 6. This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 ratio refractors. WO Flat 6 will provide good illumination and flat field across APS sized sensors and smaller. Just check out what makes it special...
-Designed with APS chip-size DSLR cameras in mind.
-FMC doublet design.
-Produced entirely with the best Ohara optical glasses.
-Reducing factor 0.8X.
-It will flatten the field amazingly well and finally make you see those stars round! Differently from other brands'' refractors, this flattener works amazingly well with the popular 66-80mm F/6 refractors.
-William Optics polished anodized finish.
-All internal surfaces threaded and blackened to prevent reflections.
Easy to Use
-Rotating T-ring thread for any 35mm camera.
-Will accept any standard T-ring for your camera.
William Optics ZenithStar 71 ED Doublet APO Refractor Telescope w/ Field Flattener 6 Features...
- Fast focal ratio for bright, high-quality astro-imaging
- Super-smooth and reliable 1:10 micro focuser for fine focusing during imaging and visual observations
- Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast
- Drawtube travel length 80 mm with graduated scale
- Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces
- ED glass (Japanese imported Ohara glass) doublet air-spaced, in CNC machined ultra-high precision lens cell
- William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube
William Optics ZenithStar 71 ED Doublet APO Refractor Telescope w/ Field Flattener 6 Specifications...
Focal Ratio: F/5.9
Focal Length: 418 mm
Objective Type: ED Doublet, Air Spaced, Fully Multi-Coated, SMC coating.
Resolving Power: 1.58"
Limiting Magnitude: 11
Lens Shade: Retractable
Focuser: 50.8mm(2") Rack & Pinion Focuser with 1:10 Dual Speed microfocuser - 80 mm (3.2")Focuser Travel Length - 360 degree Rotatable Design
1.25" Adapter: Brass Compression Rings
L-type Mount: Integrated L Bracket (fits SmartEQ mount)
Field Stops: Baffles
Tube Diameter: 93 mm (3.66")
Tube Length: 310 mm Fully Retracted - 355 mm Fully Extended
Tube Weight: 6 lbs. (2.7 kg)
Field Flattener 6 Specifications
Lens-to-chip suggested distance: 70.51mm for F/6 APO
Reducing factor: 0.8x
Rotating T-ring adapter
Weight: 165gWilliam Optics Product Number: A-Z71A-P