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Astronomy > Telescopes > William Optics > ZenithStar > William Optics Apochromatic refractor AP 81/559 ZenithStar 81 Blue OTA
Product no.: 62023

Apochromatic refractor AP 81/559 ZenithStar 81 Blue OTA

$ 1,180.00 incl. VAT, plus shipping costs
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This product is available in the following variants:
Colour Price
gold $ 1,620.00
red $ 1,620.00

Product description

More about the series ZenithStar...

The William Optics’ ZenithStar range consists of compact yet very high-quality apochromats which are ideally suited for use with a DSLR camera. With these, you can capture excellent wide-angle images of large star fields. Combined with an optional flattener, these provide a corrected image field with a diameter of 45 millimetres right up to the edges.

The lightweight and compact ZenithStar apochromat and a DSLR fit well on a photography mount, such as the Skywatcher Star Adventurer or the iOptron Star Tracker - a simple, lightweight astrophotography system.

The ZS81 is an F/6.9 FPL53 Doublet air-spaced APO with a CNC machined ultra-high precision lens cell, F/5.5 with a optional x0.8-Flattener. It comes wit a 2.5”R&P Ultra robust focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting! Heavy duty: perfect for your accessories.

It comes with a innovative Bahtinov Mask Cover!

Despite its 81mm objective, the scope is still very compact and solid. Many airlines will accept it as carry-on luggage! Perfect size for serious observations of deep sky objects and planets. Solar observations possible with proper additional equipment.

This beautiful scope is everything you always wanted in a refractor, starting from extreme sharpness for clear details, and APO color correction.

It not only matters which telescope you buy but also where you buy it. Our additional services:

  • We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
  • We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.
  • We also provide an edition of the exciting astronomy magazine, “Sterne und Weltraum” with each telescope.

Specifications

Optics


Type
Refractor
Aperture (mm)
81
Focal length (mm)
559
Aperture ratio (f/)
6,9
Resolving capacity
1,70
Limit value (mag)
11,3
Light gathering capacity
130
Max. useful magnification
162
Carrying length (mm)
456
Tube weight (kg)
3,5
lens design
Doublet
Type of build
Apochromat

Focuser


Type of build
Gear rack
Connection ( to eyepiece)
2
Gear reduction
1:10 Fine movement
Connecting threaded socket (camera-side)
M63
Free aperture (mm)
64

Mount


Type of build
OTA
Mounting type
no mount

Included accessories


Carrying handle
yes
Carry case
yes
Miscellaneous
Bahtinov focus mask
Tube clamps
yes
Prism rail
Arca-Swiss & Vixen-Style
Dew Shield
yes

General


Series
ZenithStar
Colour
blue

Area of application


Astrophotography
yes (very good)
Moon & Planets
yes (very good)
Nature Observation
no
Nebulae & galaxies
yes
Sun
no (Only with appropriate Sun filter)

Recommended for


Beginners
no
Advanced
yes
Observatories
no

Recommended accessories

Media (2)
Star chart

Omegon Star chart Planisphere

$ 14.90*
Outdoor (2)
Headlamp

Omegon LED headlamp

$ 13.90*
Astronomy (2)
Amici prism

Omegon 1,25'' Amici Prism 90°

$ 169.00*
Solar Observation (2)

Baader Sun filter foil 20 x 29 cm

$ 31.90*
Maintenance & Cleaning > Lens cleaners (3)

Omegon 7-in-1 lens cleaning set

$ 19.90*
Maintenance & Cleaning > Other (2)

Omegon microfibre cleaning cloth 20cm x 20cm

$ 4.90*

*All prices include VAT plus shipping costs.

William Optics Apochromatic refractor AP 81/559 ZenithStar 81 Blue OTA
F/6.9 FPL53 Doublet air-spaced APO
William Optics Apochromatic refractor AP 81/559 ZenithStar 81 Blue OTA
Focuser
William Optics Apochromatic refractor AP 81/559 ZenithStar 81 Blue OTA
Bahtinov focus mask

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