Skip to content
William Optics Fluorostar 91

William Optics Fluorostar 91

by William Optics
SKU WO-T-FLT-91SG-RP33
$2,697.00 - $2,697.00
$2,697.00
$2,697.00 - $2,697.00
$2,697.00
Credit available from affirm logo
Availability:
1 in stock
Availability:
Backordered
Check the other options, 1 is in stock!
Availability:
Backordered
Check the other options, 1 is in stock!

Free Shipping in Canada

More information

The FLT 91 is the perfect Apochromatic refractor for visual and photographic astronomers demanding excellence in a midsize telescope. The three-element optical design features a 91mm aperture using FPL-53 glass. The STM-coatings and superb quality provide excellent optical performance and unmatched value.

Rotolock

The Rotolock 2 inch adapter provides for a solid and efficient connection for a WO 2 inch diagonal, and other accessories.

Bahtinov Mask

The retractable dew shield features a removable lens cover, with our patented Bahtinov Mask revealed by unscrewing the face plate. The clear design allows for brighter star patterns, and precise focusing for astrophotography.

Versatile Saddle Bar

The Saddle Bar Handle, offers a solid handle with a built in dovetail chamber for use with the WO Uniguide scopes, or other Vixen style guiding/finder scopes.

New Focuser Knob

A larger fit designed for better ergonomics.

Field Rotator

The super smooth field rotator includes markings for every degree, and a solid thumbscrew position lock.

Soft Carry Case

The standard package comes with a soft carry case.

Specifications

Lens Type

Apochromatic Triplet Prime Lens

Focal Length

540mm

Diameter

91mm

Aperture

f/5.9

Focuser

Dual Speed 3.3" R&P Focuser

Color

Red Space grey

Lens Material

FPL-53

Strehl Ratio

0.95

Camera Format

Full Frame DSLR / Mirrorless / CMOS / CCD

Test Report

Zygo test report available at additional cost

T-Mounts Supported

Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds (M4/3) FUJI X

Retracted Length

441mm

Extended Length

510mm

Extension Tube Length

40mm

OTA Weight

4.165Kg

Total Weight

5.575Kg

Extension Tube Weight

0.105Kg