Skip to content
Search
Learn
In Store Classes
How to Choose a Telescope
Best Telescopes for Kids
Service & Repair
Books & Charts
Astronomy Blog
Store News
Gift Cards
Telescopes
In Stock Telescopes
How to Choose a Telescope
Astrophotography Kits
Smart Telescopes
Best for Kids
Best Manual
Best Computerized
Best for Astrophotography
Optical Tube Assemblies
Solar Telescopes
Sport Optics
Binoculars
Spotting Scopes
By Type
Binoculars
Spotting Scopes
Refractors
Reflectors / Newtonians
Dobsonians
Maksutov-Cassegrains
Ritchey-Chrétien Astrographs
Schmidt-Cassegrains
Solar Telescopes
Celestron
All Celestron
Origin Intelligent Home Observatory
Advanced VX
CGEM II
CGX & CGX-L
CPC & CPC Deluxe
NexStar SLT
NexStar SE
NexStar Evolution
EdgeHD
RASA Astrograph
Starsense Explorer
Explore Scientific
iOptron
Sky-Watcher
All Sky-Watcher
AZ-GT Series
Dobsonians
EvoStar Doublet ED Refractors
Esprit Triplet APO Refractors
Quattro
Maksutovs
Tele Vue
Vaonis
William Optics
ZWO / ASI
Mounts
Alt-Az Mounts
Camera Tracker Mounts
EQ Mounts
Sky-Watcher WAVE Mounts
ZWO AM3/AM5 Mounts
Mount Accessories & Upgrades
Counterweights
Tripods
Wedges
Accessories
Astrophotography
Autoguiders
Bahtinov Focus Masks
Cameras - DSO Imaging
Cameras - Planetary Imaging
Smartphone Adapters
ZWO Products
Binoculars
Books & Charts
Barlows
Cases
Covers
Cleaning & Collimation
Dew Shields & Heaters
Diagonals
Dovetail Bars
Eyepieces
Eyepiece Kits
Filters
Finder & Polar Scopes
Flashlights
Parts
Power & Batteries
Screws & Fasteners
Solar Eclipse Glasses
Solar Filters
Fun Stuff
Art
Books
Celestial Buddies
Jewelry
LEGO
Magnets
Metal Earth Kits
Meteorites
Patches
Pins
Stickers
T-shirts & Apparel
Gift Cards
Sale
Current Sales
Used & Clearance Sale
CLEARANCE
Used Gear
Sell Us Your Used Gear
Account
Site navigation
Search
Search
Cart
Menu
Site navigation
Learn
Learn
All
In Store Classes
How to Choose a Telescope
Best Telescopes for Kids
Service & Repair
Books & Charts
Astronomy Blog
Store News
Gift Cards
Firefly Books
Nightwatch by Terence Dickinson, 5th Edition
Regular price
$39.95
10 in stock
View
David Chandler Company
The Night Sky Planisphere 40-50 - Large
Regular price
$14.95
5 in stock
View
Cambridge University Press
Turn Left at Orion
Regular price
$36.99
7 in stock
View
John A Read
50 Things To See With A Telescope - Kids
Regular price
$19.95
4 in stock
View
Telescopes
Telescopes
All
In Stock Telescopes
How to Choose a Telescope
Astrophotography Kits
Smart Telescopes
Best for Kids
Best Manual
Best Computerized
Best for Astrophotography
Optical Tube Assemblies
Solar Telescopes
Sport Optics
Binoculars
Spotting Scopes
By Type
Binoculars
Spotting Scopes
Refractors
Reflectors / Newtonians
Dobsonians
Maksutov-Cassegrains
Ritchey-Chrétien Astrographs
Schmidt-Cassegrains
Solar Telescopes
Celestron
All Celestron
Origin Intelligent Home Observatory
Advanced VX
CGEM II
CGX & CGX-L
CPC & CPC Deluxe
NexStar SLT
NexStar SE
NexStar Evolution
EdgeHD
RASA Astrograph
Starsense Explorer
Explore Scientific
iOptron
Sky-Watcher
All Sky-Watcher
AZ-GT Series
Dobsonians
EvoStar Doublet ED Refractors
Esprit Triplet APO Refractors
Quattro
Maksutovs
Tele Vue
Vaonis
William Optics
ZWO / ASI
Vaonis
Hestia Premium Pack Smartphone Telescope
Regular price
$349
Sale price
$179
10+ In Stock
Sale
View
Celestron
NexStar 6SE SCT
Sold Out
Sale
View
Mounts
Mounts
All
Alt-Az Mounts
Camera Tracker Mounts
EQ Mounts
Sky-Watcher WAVE Mounts
ZWO AM3/AM5 Mounts
Mount Accessories & Upgrades
Counterweights
Tripods
Wedges
iOptron
SkyGuider Pro package
On sale from $359
In Stock
Sale
View
Mile High Astronomy
Precision Tripod Leveler for SeeStar
Regular price
$39.95
Sale price
$29.95
10+ In Stock
Sale
View
iOptron
Tripod 1.25" for SkyTracker Pro, SkyGuider Pro
Regular price
$108
10 in stock
View
Accessories
Accessories
All
Astrophotography
Autoguiders
Bahtinov Focus Masks
Cameras - DSO Imaging
Cameras - Planetary Imaging
Smartphone Adapters
ZWO Products
Binoculars
Books & Charts
Barlows
Cases
Covers
Cleaning & Collimation
Dew Shields & Heaters
Diagonals
Dovetail Bars
Eyepieces
Eyepiece Kits
Filters
Finder & Polar Scopes
Flashlights
Parts
Power & Batteries
Screws & Fasteners
Solar Eclipse Glasses
Solar Filters
Celestron
Lens Pen - Optics Cleaning Tool
Regular price
$11.95
10+ In Stock
View
Celestron
NexYZ DX Smartphone Adapter Kit
Regular price
$69.95
10+ In Stock
View
Fun Stuff
Fun Stuff
All
Art
Books
Celestial Buddies
Jewelry
LEGO
Magnets
Metal Earth Kits
Meteorites
Patches
Pins
Stickers
T-shirts & Apparel
Gift Cards
Fascinations
Artemis Moon Rocket
Regular price
$37.95
4 in stock
View
LEGO
LEGO Icons NASA Space Shuttle Discovery 10283
Regular price
$279.99
Sale price
$229.99
2 in stock
Sale
View
LEGO
LEGO Creator Expert NASA Apollo 11 Lunar Lander 10266
Regular price
$139.99
3 in stock
View
Sale
Sale
All
Current Sales
Used & Clearance Sale
CLEARANCE
Used Gear
Sell Us Your Used Gear
Sky-Watcher
EQ8-Rh Pro GoTo Equatorial Mount with Renishaw Encoder
On sale from $8,999
Sale
View
ZWO
ZWO FF107 AM5N Traveler All-in-One Imaging Kit
Regular price
$7,385
Sale price
$6,575
3 in stock
Sale
View
ZWO
Redcat 71 AM5N Traveler All-in-One Imaging Kit
Regular price
$6,779
Sale price
$5,799
3 in stock
Sale
View
ZWO
Redcat 71 AM3N Traveler All-in-One Imaging Kit
Regular price
$5,879
Sale price
$5,199
3 in stock
Sale
View
Account
Item added to cart.
View cart and check out
.
Close
Close
William Optics
UltraCat 131
Sale
Regular price
$7,777.00
Default Title - Sold Out
Sold Out
Qualifies for Free Ground Economy Shipping (CONUS Only)
Details coming soon...
Sign up for notifications for when pre-orders open.
SKU:
Barcode:
Share
Share on Facebook
Tweet on Twitter
Pin on Pinterest
Back to William Optics Cats
"Close (esc)"
Qualifies for Free Ground Economy Shipping (CONUS Only)
Qualifies for Free Ground Economy Shipping (CONUS Only)