William Optics FLT 91 Fluorostar 91mm f/5.9 Triplet Apo Refractor with Carry Case - Space Gray # T-FLT-91SG-RP33
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
Please note: The 32mm guidescope shown in some of the product photos above is NOT included.
Product Details
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.
Features:
- 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
- Recommended Flatteners (Not included): FLAT 6A III x0.8 FLAT 68 III x1.0 (use of the Flat68III requires the use of a special adapter that is sold separately)
- Focuser: Dual Speed 3.3" R&P Focuser
- Lens Material: FPL-53
- Strehl Ratio: 0.95 or higher guaranteed (Scope with Strehl of 0.98+ available by special order for $450 more - check availability with us before placing any order)
- Camera Format: Full Frame DSLR / Mirrorless / CMOS / CCD
- Test Report: Zygo test report available at additional cost after purchase (not available before or with purchase)
- 48mm Wide 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
- Dew shield OD: 121mm / 4.76"
- OTA Weight: 4.165Kg
- Total Weight: 5.575Kg
- Extension Tube Weight: 0.105Kg
What's in the Box
- Fluorostar 91
- Vixen Saddle Plate
- Visual Extension Tube
- Handle Bar
- Built-in Bahtinov Mask Cap
- Soft Carry Case
- Note: Guidescope shown in the photo above is not included
Other Information
- Country of Manufacture: Taiwan
