William Optics
William Optics FLT-91 f/5.9 APO (Space Grey) + FLAT91 + FREE International Shipping
MSRP:
HK$19,480.00
Was:
HK$19,480.00
Now:
HK$18,580.00
(You save
HK$900.00
)
- SKU:
- WO-T-FLT-91SG-RP33+FLAT91
- Availability:
- Accepting order now!
- Weight:
- 9.00 KGS
- Shipping:
- Calculated at Checkout
Accepting order now, Black Friday Cyber Monday 2025 Special 5% Offer!
With FLAT91 ultra flat reducer
**Free International Shipping to most locations **
Available in space grey only
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
|
On Sale!
William Optics
William Optics FLT-91 f/5.9 APO (Space Grey) + FREE International Shipping
MSRP:
HK$16,480.00
Was:
HK$16,480.00
Now:
HK$15,680.00
On Sale!
William Optics
William Optics GT71 71mm f/5.9 Triplet APO Imaging Package + FREE International Shipping
MSRP:
HK$8,880.00
Was:
HK$8,940.00
Now:
HK$8,480.00
On Sale!
William Optics
William Optics RedCat 61 WIFD 300mm f/4.9 APO + FREE International Shipping
MSRP:
HK$8,980.00
Was:
HK$8,980.00
Now:
HK$8,580.00