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*PREORDER* กล้องดูดาว William Optics Fluorostar 91 with 3.3" R&P Focuser in Red
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William Optics Fluorostar 91, Red
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
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.
Technical 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
OPTIONAL ACCESSORIES
UNIGUIDE 32/120MM
FLAT 6A III 0.8x
Focal length: 432mm
