Lens Type | Triplet Apochromatic Prime Lens |
Focal Length | 540 mm |
Diameter | 91 mm |
Aperture | f/5.9 |
Image circle | 43 mm |
Focuser | 3.3” R&P Focuser (Compatible with EAF) |
Adapter Included | M92 Rotator / M92 Extender / M92 → 2” RotoLock |
Optional Flattener | FLAT68III 1.0x (requires adapter)
FLAT6AIII 0.8x (requires adapter)
Ultra Flat 0.79x |
Camera Format | Full Frame (Compatible) / APS-C (Recommend) / M43 |
Tube Length | 441 mm - 510 mm |
OTA Weight | 4.16 kg / 9.17 lbs |
Total Weight | 5.57 kg / 12.28 lbs |
Diagram Reports
Package Content
A. Bahtinov Mask
B. OTA
C. Saddle Handle Bar (HC120)
D. M92 Visual Extender
E. 2” RotoLock Visual Back Adapter
F. Vixen-style Dovetail Plate (PV-LII)
G. Soft Carry Case
Parts
A. 2” RotoLock Visual Back Adapter
B. Visual Extention Tube
C. Camera Angle Rotator Locking Screw
D. Dual Speed 3.3” R&P Focuser
E. Focuser Rotation Locking Screw
F. Mounting Rings / Knobs
G. Saddle Handle Bar (HC120)
H. Dew Shield Locking Screw
I. Dew Shield
J. Lens Cover with Bahtinov Mask
K. Camera Angle Rotator
L. 10:1 Ratio Fine Knob & Cap
M. Vixen-style Dovetail Plate (PV-LII)
N. Handle Bar Locking Screws (M4)
O. M4 Screw Holes
P. M6 Screw Holes
Q. Focuser Adjusting Knob with Thermometer
Hardware Parts
Code Name | Quantity | Usage |
2 | Secure the handlebar to the mounting ring. | |
1 | Secure the guider to the handlebar. | |
1 | Secure the dew shield |
Adaption Guide
graph LR
A(Focuser) -.->CAA(Adapter + Rotator)-.->Ex(<img src='https://williamoptics.com/cdn/shop/files/P-M92EX-1.jpg'>Extention Tube)
-.->2rotolock(<img src='https://williamoptics.com/cdn/shop/files/RotoLock-2-red.jpg'>2” RotoLock)
2rotolock ===>2Dig(<img src='https://williamoptics.com/cdn/shop/files/DIG2-90-1.jpg'>2” Diagonal)
==>2E(<img src='https://williamoptics.com/cdn/shop/files/E-SWA40-1.jpg'>2” Eyepiece)
2rotolock ==>125rotolock(<img src='https://williamoptics.com/cdn/shop/files/RotoLock-1.25-red.jpg' width='10'> 2 → 1.25' RotoLock)
==>1Dig(<img src='https://williamoptics.com/cdn/shop/files/DIG125-90-1.jpg'>1.25” Diagonal)
==>1E(1.25”Eyepiece)
CAA ==> F68 & FA
FA(<img src='https://williamoptics.com/cdn/shop/files/M92-M63.jpg'>Front Adapter)
F6A(<img src='https://williamoptics.com/cdn/shop/files/P-FLAT6AIII-2.jpg'>Flat 6AIII<br>0.8x)
F68(<img src='https://williamoptics.com/cdn/shop/files/P-FLAT68III-2.jpg'>Flat 68III<br>1.0x)
F91(<img src='https://williamoptics.com/cdn/shop/files/UltraFlat-91-1.jpg'>Ultra-Flat 91<br>0.79x)
A ===>F91===>AC
subgraph1 ===> T & AC
T(<img src='https://williamoptics.com/cdn/shop/files/TM-NK-F-M48-1.jpg'>T-Mount)==>C(Camera)
AC(Astro-Camera)
subgraph subgraph1 [M48 Flattener]
F68 ==> BE(<img src='https://williamoptics.com/cdn/shop/files/M80-45-M48.jpg'>Back Extender)
FA ==> F6A
end
click 125rotolock "https://williamoptics.com/products/2-125-rotolock-visual-back-adapter"
click 2Dig "https://williamoptics.com/products/dura-bright-2-90-dielectric-diagonal"
click 1Dig "https://williamoptics.com/products/dura-bright-125-90-dielectric-diagonal"
click Ultra "https://williamoptics.com/products/ultra-flat-91"
click BE "https://williamoptics.com/products/45mm-flattener-extender"
click FA "https://williamoptics.com/products/m92-to-m63-adapter"
click F6A "https://williamoptics.com/products/flat6Aiii"
click F68 "https://williamoptics.com/products/flat68iii"
click F91 "https://williamoptics.com/products/ultra-flat-91"
click 2E "https://williamoptics.com/products/swan-40mm-2-eyepiece"
click 1E "https://williamoptics.com/collections/eye-pieces"
click T "https://williamoptics.com/collections/adapters"