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Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
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30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
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Product Description
If you're in search of top-tier imaging performance, this William Optics Ultra-Cat 108 is the telescope for you. With 5 internal lens elements composed of high quality glass, you can expect stunningly sharp, well-corrected astrophotos! As a Petzval refractor, there is no need for an additional field flattener nor backspace calculation, making camera attachment a breeze. Stars will be sharp across the entire field of view, even for medium-format and full frame cameras! Thanks to the innovation from William Optics, this Ultra-Cat 108 APO Refractor is sure to take your astrophotography to the next level.
The 108 mm aperture paired with the 518 mm focal length results in a focal ratio of f/4.8, making this a speedy system for deep space imaging. Featuring an incredibly large image circle of 60 mm, the William Optics Ultra-Cat 108 supports medium-format and full frame cameras for stunning wide field images. In addition to these superior optics, this APO telescope comes furnished with the William Optics Internal Focus Design (WIFD) for smooth, stable focusing. You even have the ability to attach an electronic autofocuser (not included) to this telescope for automatic, hands-free focusing. With features like these, the William Optics Ultra-Cat 108 is the ultimate tool for astrophotographers eager to capture breathtaking images of our universe.
Included Sensor Tilt Xterminator (STX)
The STX builds upon the foundation of traditional sensor tilt adjusters, offering a streamlined and intuitive design that eliminates the need for cumbersome disassembly. Unlike conventional systems that require camera removal for tilt correction, the STX allows adjustments to be made directly from the side of the assembly, significantly reducing setup time and enhancing ease of use.
By refining the original 4 pull-in and 8 push-out screw configuration into a more efficient 4 push-out and 4 locked screw system, the STX enables precise and controlled adjustments. Operating like a seesaw mechanism, the system allows for effortless corrections—simply loosen one screw and tighten the opposite diagonal screw to achieve fine tilt alignment. This ensures that astrophotographers can make on-the-fly refinements without disrupting their imaging workflow, maintaining pinpoint star performance across the entire frame.
What's in the Box
Specifications
| Design: | 5-Element Advanced Petzval |
| Lens Elements: | 2x Super ED Glass 1x ED Glass 1x Lanthanum Glass 1x X-Element |
| Focal Length: | 518mm |
| Diameter: | 108mm |
| Aperture: | f/4.8 |
| Focuser: | WIFD (WilliamOptics Internal Focus Design) |
| Image Circle: | 60mm >Full Frame |
| Tube Length: | 510.5mm-588.5mm |
| Total Weight: | 17.53 lbs |
| Adapters Included: | Sensor Tilt Xterminator Rotator M68/M54/M48 Camera Adapters |
| T-Mounts Supported: | Canon EF/RF Nikon F/Z Sony E Pentax K MFT (M4/3) FUJI X |
| Camera Formats Supported: | Medium Format (Compatible) Full Frame (Recommended) APS-C M4/3 |
Spot Diagram
MTF Diagram
Relative Illumination
What can I see with a William Optics Ultra-Cat 108 WFID APO Petzval OTA (L-UC108)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 14x Magnification
(Sold Separately)
Jupiter with
10mm Eyepiece - 35x Magnification
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Jupiter with
5mm Eyepiece - 70x Magnification
Sold Separately
Moon with 25mm Eyepiece
14x Magnification
(Sold Separately)
Moon with 10mm Eyepiece
35x Magnification
Sold Separately
Moon with 5mm Eyepiece
70x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
10x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
14x Magnification
(Sold Separately)
Andromeda with 10mm Eyepiece
35x Magnification
Sold Separately
