Brand: William Optics

William Optics Gran Turismo 81 IV Triplet APO (A-F81GTIV)

Brand: William Optics

William Optics Gran Turismo 81 IV Triplet APO (A-F81GTIV)

The William Optics Gran Turismo 81 Imaging APO Telescope is a high quality Apochromatic Imaging optical telescope with an aperture of 81 mm and a focal length of 478 mm or an f-ratio of f/5.9, without the optional Reducer/Flattener.
  • 2.5" R&P Focuser - The 2.5" R&P focuser is smooth, stable, and reliable. No image shifting!
  • New Designed Rotator - William Optics' newly designed camera angle rotator. Smooth and stable.
  • CNC Handle Bar - CNC-made Handle Bar with Vixen type saddle, anodized to match the optical tube.
  • Bahtinov Mask - World's First built-in Clear Bahtinov Mask.
Special Order
$1,514.00 USD

Accent Color

Red (A-F81GTIVRD) Gold (A-F81GTIVGD)

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How do I Special Order?
Special Order
$1,514.00 USD

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Product Description

The William Optics Gran Turismo 81 Imaging APO Telescope is a high quality Apochromatic Imaging optical telescope with an aperture of 81 mm and a focal length of 478 mm or an f-ratio of f/5.9, without the optional Reducer/Flattener.

If you wish to take great astro-images with a high quality APO refractor, this William Optics Gran Turismo 81 Imaging APO telescope is a good way to obtain your goal. Its FPL-53 glass APO design provides images with extreme sharpness, clear details, great color, with APO grade color correction.

Introducing a first innovative feature in the industry: Now this Gran Turismo 81 Imaging APO Telescope from William Optics comes standard with a dust cover that has a built-in, clear Bahtinov Mask for perfect focusing every time. Simply remove the flat front cover plate, leaving the dust cover cuff in place on the scope. Point the telescope at a bright star, and focus carefully. When the bright central diffraction spike looks exactly centered between the other two spikes forming an "X", then your telescope is in exact focus for stars. Remove the dust cover cuff carefully from the objective end of the telescope, and you are ready to image.

Recommended Optional Accessories

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

What can I see with a William Optics Gran Turismo 81 IV Triplet APO (A-F81GTIV)?

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 - 19x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 48x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 96x Magnification

Sold Separately

Moon with 25mm Eyepiece

19x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

48x Magnification

Sold Separately

Moon with 5mm Eyepiece

96x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

13x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

19x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

48x Magnification

Sold Separately

What's in the Box

  • Gran Turismo 81 mm f/5.9 FPL53 APO Triplet Refractor Telescope OTA
  • Two Clamshell-style Telescope Mounting Rings w/ knurled clamp screws
  • Vixen-style (or Arca-Swiss) Dovetail Plate for mounting the scope
  • APO (Apochromatic) design Objective w/ FPL-53 glass
  • 2.5" Dual-speed Rack & Pinion style Focuser
  • Machined Carrying Handle
  • High Quality Soft Carry Bag

Specifications

Focal Length: 478mm
Diameter: 81mm
Aperture: f/5.9
Camera Format: APS-C
Full Frame
Focuser: 2.5" R&P Focuser
Image Circle: > Full Frame
Recommended Flattener: FLAT 6A III
Tube Length: 390mm (Fully Retracted)
460mm (Fully Extended)
Tube Weight: 3.9 kg
Interchangeable T-Mount: Canon EF
Nikon F
Sony E
Pentax
Micro Four Thirds
Fuji FX

Note: William Optics uses high quality steel lens cells and FPL53 glass for WO triplet series (GT and FLT) - this combination is perfect for temperature compensation and will prevent pinched optics in cold weather conditions.

Before you store the telescope you have to uncover it and let the tube to stay open for some time. After the telescope dry up, moisture will evaporate and it can be safely stored. You must to store your telescope in a dry place with a constant room temperature.

Otherwise lens cell will rust and lens coating will be damaged by fungus.

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