107FL F3.9ED with Feathertouch focuser
BORG
From $4,595.00
2 stores
In stock
The BORG 107FL F3.9ED is an ultra-fast fluorite apochromatic astrograph designed specifically for astrophotography with a 6-element Petzval optical system featuring Canon fluorite and ED glass elements. With its exceptional f/3.9 focal ratio and 55mm image circle, this portable 4-inch refractor excels at deep-sky imaging and is compatible with large-sensor cameras including full-frame and medium-format formats. The included Feathertouch True 3-inch focuser provides precise focusing control, while the compact carbon fiber tube design makes this premium astrograph remarkably lightweight and airline-transportable—ideal for astro-imaging expeditions.
Specifications
| Optical design | Petzval |
| Highest magnification | 214 |
| Aperture | 107 mm |
| Focal length | 420 mm |
| Focal ratio | f/3.9 |
| Weight | 4.3 lb |
| Physical Length | 440 mm |
| Tube Diameter | 115 mm |
| Image Circle | 55 mm |
| Back Focus | 80 mm |
| Full Frame Illumination | 77% |
| Optical Elements | 6 |
| Lens Configuration | 6-element Petzval with fluorite and ED elements |
| Focuser Type | Feathertouch True 3-inch |