Fluorostar 91

New for 2021 -

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

Patented

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

Patented

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.

Technical Specifications

Lens Type
Apochromatic Triplet Prime Lens
Focal Length
540mm
Diameter
91mm
Aperture
f/5.9
Flattener
FLAT 6A III x0.8
FLAT 68 III x1.0
Focuser
Dual Speed 3.3" R&P Focuser
Color
Red
Gold
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

Optional Accessories

UNIGUIDE 32/120MM

FLAT 6A III 0.8x

Focal length: 432mm

What's in the Box

Fluorostar 91

Vixen Saddle Plate

Visual Extension Tube

Soft Carry Case

Handle Bar

Built-in Bahtinov Mask Cap