Optiques Fullum Folded Newtonian 55" f/3.5
Lead-time: TBA
Ships To: United States & Canada 🇺🇸 🇨🇦
✓ Free U.S. Shipping (on most orders over $150 USD)
✓ Price Match Available
✓ Authorized Dealer
✓ Bulk Order Discounts Available
✓ Questions? Call Us 1-800-860-3429
Shipping & Returns
We offer free U.S. shipping to the lower 48 States - on most orders over $150 USD. Some limitations may apply.
Shipping fees will apply on most orders shipping across Canada, with some exceptions.
We offer a 30 Day Return Policy on most of the products that we carry.
For full details on our Shipping & Returns Policy, please click here.
Warranty
The vast majority of products that we sell, with a few exceptions, are covered under Warranty.
To view the Warranty details for each brand that we sell, including products that do not qualify for Warranty, please visit here.
NOTE: These Telescopes are custom-made systems. Please contact us to discuss your specific requirements at support@redcarpettelescopes.com, or feel free to call us during our posted business hours at 1-800-860-3429. The final price can vary depending on your custom requirements. The price does not include crating and shipping.
Fullum-folded Newtonian®: For large telescopes of 30 inches and more, Optiques Fullum developed a unique “Fullum-folded Newtonian” structure. In this configuration, a parabolic primary mirror with a very short focal (F/3.5-F/4) is coupled to a secondary mirror placed much lower than normal, which will redirect the optical axis at a 17.5-degree angle instead of 45 degrees. This results in a more secure focal spot for the observer.
- For example, a 50-inch F/3.5 telescope ocular support would normally be made at a height of 18 feet. By using the unique “Fullum Folded” structure, the ocular support will be at a height of only 8.5 feet.
Specifications:
- Optical design: Newtonian reflector
- Objective diameter: 1397 mm
- Focal length: 4889 mm
- Focal ratio: f/3.5
- Resolving power: 0.08 arc second
- Stellar limiting magnitude: 18.43
- Max. magnification: 3492 x (theoretical)
- Light gathering power: 39,828 times the human eye
- SKU: OF-55FOLDED
In the following video, Normand Fullum describes how he developed, and produces, his lightweight Techno-Fusion primary mirrors for the Fullum Folded Newtonian telescopes:
In the following video, the RASC (Royal Astronomical Society of Canada) gets a tour of Normand Fullum's workshop: