William Optics Fluorostar FLT 91 Apochromatic Triplet Refractor Telescope
New for 2021 - William Optics Fluorostar FLT 91 Apochromatic Triplet Refractor!! 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.
- Lens Type - FPL-53 Apochromatic Triplet Prime Lens
- Strehl Ratio - 0.95+
- Diameter - 91mm
- Focal Length - 540mm, f/5.9
- Focuser - Dual Speed 3.3" R&P Focuser
- Camera Format - Full Frame DSLR / Mirrorless / CMOS / CCD
- Test Report Zygo test report available at additional cost
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.
Visual setup:
FLT91 + 2" Diagonal + Eyepieces.
It is recommended to use the extension tube which is included.
Imaging:
FLT91 + Flat6aIII + CCD (55mm CCD setup)
When you use a flattener the extension tube should be removed.
Flat6aIII settings - 5.4mm.
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