Brand: William Optics

William Optics ZenithStar 61II Doublet APO (A-Z61II)

Brand: William Optics

William Optics ZenithStar 61II Doublet APO (A-Z61II)

This Z61 refractor gives a high power performance both visually and, when paired with the P-FLAT61R (not included), for lunar photography. The ZenithStar 61 is a great instrument you'll be able to appreciate for several years to come!
  • 2" R&P Focuser - The 2" R&P focuser is smooth, stable, and reliable. No image shifting!
  • Cat Handle bar - CNC-made Cat Handle Bar with Vixen type saddle, suitable for WO Uniguide.
  • Bahtinov Mask - World's First built-in Clear Bahtinov Mask.
$589.00 USD

Accent Color

Red (A-Z61IIRD) Gold (A-Z61IIGD) Space Gray (A-Z61IITG)

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$589.00 USD

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Full Details What Can I See? What's in the Box? Specifications Reviews and Questions Articles, Videos, Software, Links

Product Description

This William Optics ZenithStar 61mm APO refractor with WO Bahtinov mask cover provides more portability and utility than any telescope ever offered by William Optics. The refractor uses FPL-53 glass to produce sharp images for astrophotography or wildlife photography. Still maintaining a portability that makes this telescope a great grab-and-go tool, the Z61 refractor gives a high power performance both visually and, when paired with the P-FLAT61R (not included), for lunar photography. The ZenithStar 61 is a great instrument you'll be able to appreciate for several years to come!

The William Optics Z61 objective lens uses FPL-53 glass has ED and SD glass dispersion properties are critical to ascertain the general color correction. The abbe index is the number used to quantify the "partial dispersion" of a specific glass. FPL-53 glass features a partial dispersion that is so close to pure fluorite, which has the highest partial dispersion of any material at around 95 V, that it has been referred to as synthetic fluorite.

You can be assured that your instrument was tested on their Interferometer; each telescope is individually star tested by William Optics professionals to guarantee ultimate optical quality.

William Optics has included two fantastic accessories with the purchase of this Z61 refractor. When you purchase this OTA, you also get the William Optics Cat Series handle bar and a 210mm dovetail plate, both anodized to match the color accents on the telescope.

About the Cat Series Handle Bar

When paired with the included Z61 mounting rings, this Vixen style handle bar is a great way to carry your light weight refractor around. It also accepts Vixen style dovetails for guide scopes and guide rings. William Optics' 50mm guiding ring and the WO 50mm Uniguide guide scope (both not included) are compatible with the handle.

About the 210 mm Dovetail Plate

The William Optics DSD 210mm (8.27") dovetail plate has both a Vixen and Arca Swiss size at each end of the plate. The plate has two 1/4-20 threaded holes. The dovetail plate is the perfect accessory to help you mount your Z61 telescope for imaging sessions and visual observations.

Recommended Optional Accessories

  • T-Mount for
    • M4/3
    • Nikon
    • Canon
    • Sony a
    • Pentax
    • Fuji
  • Uniguide
  • Flattener
  • Eye Pieve & Prism
  • Finder Scope & Ring
  • Red Dot Finder

What can I see with a William Optics ZenithStar 61II Doublet APO (A-Z61II)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 14x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 36x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 72x Magnification

Sold Separately

Moon with 25mm Eyepiece

14x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

36x Magnification

Sold Separately

Moon with 5mm Eyepiece

72x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

10x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

14x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

36x Magnification

Sold Separately

What's in the Box

  • ZenithStar 61 mm f/5.9 APO Doublet Refractor Telescope OTA
  • 2" Dual-Speed Rack & Pinion Focuser
  • 1.25" Compression Ring Adapter
  • Rotatable L-Photo Tripod Bracket
  • Patented Bahtinov Mask Cover
  • Carry Case
  • Mounting Ring
  • CAT handle Bar
  • 210 mm Dovetail Plate

Specifications

Focal Length: 360mm
Diameter: 61mm
Aperture: f/5.9
Camera Format: APS-C
Full Frame
Focuser: 2" R&P Focuser
Image Circle: > Full Frame
Recommended Flattener: FLAT 61A
FLAT61R
Tube Length: 245mm (Fully Retracted)
315mm (Fully Extended)
Tube Weight: 2.2 kg
Interchangeable T-Mount: Canon EF
Nikon F
Sony E
Pentax
Micro Four Thirds
Fuji FX

Customer Reviews

Based on 2 reviews
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(1)
50%
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K
K.B.
Professional Service

Professional service, helped me with what i requested and did not try to upsale me.

F
F.B.
Nice piece of kit

It's well made and honestly very nice. Skies haven't been very clear but the few pics I've got seem ok. I'm struggling with proper backfocus with the mirrorless canon, i have the field flattener and the proper t ring. I'm sure I will get it once I have more time with it and some clear skies.

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