55FL F3.6 with Feathertouch focuser
BORG
From $1,795.00
2 stores
In stock
The BORG 55FL F3.6 features a 55mm objective with fully multi-coated optics in a 6 element 5 group configuration with one Fluorite element, designed for both visual and imaging applications. This astrograph boasts a small size for easy transportation including airline and overseas expeditions, making it an ideal portable, high-quality optical tube. It includes a FeatherTouch 2" dual speed focuser with 0.8" draw tube travel, and the short focal length and fast focal ratio make it ideal for shooting wide field extended objects.
Specifications
| Optical design | Petzval |
| Highest magnification | 110 |
| Aperture | 55 mm |
| Focal length | 200 mm |
| Coating | Fully multi-coated |
| Back Focus Distance | 60 mm |
| Accessory Thread | 57 |
| Lens Configuration | 6 elements in 5 groups with Fluorite |
| Image Circle | 43 mm |
| Focal ratio | f/3.6 |
| Weight | 1.1 lb |
| Physical Length | 180 mm |
| Focuser Type | FeatherTouch 2 inch dual speed |
| Tube Diameter | 80 mm |
| Draw Tube Travel | 0.8 in |