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- 2021 NEW Release: William Optics FLT-91 f/5.9 APO + FREE International Shipping
2021 NEW Release: William Optics FLT-91 f/5.9 APO + FREE International Shipping
2021 NEW Release: William Optics FLT-91 f/5.9 APO + FREE International Shipping
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Product Description
Accepting order now, limited quantity available!
**Free International Shipping to most locations **
Available in space grey, red and gold
Recommended Accessories:
- WO Flat6A-III 0.8x reducer flattener
- Flat6A-III to FLT-91 Adapter (compulsory item for installing Flat6A-III)
- Uniguide 32mm Scope
Technical Specifications
|
Lens Type |
Apochromatic (APO) Triplet Prime Lens
|
|
Focal Length |
540mm |
|
Aperture |
91mm |
|
Focal Ratio |
f/5.9 |
|
Focuser |
Dual Speed 3.3" Rack & Pinion 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 |
4.17Kg |
|
Total Weight |
5.58Kg |
|
Extension Tube Weight |
0.11Kg
|
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