Borg 55FL F3.6 Astrograph with Feathertouch Focuser
- Choose your accent color: Sunrise Blue or Sunset Orange
- Telescope Aperture: 55mm
- Telescope Focal Ratio: f/3.6
- 43mm corrected image circle
Accessories Added
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Borg 55FL F3.6 Astrograph with Feathertouch Focuser
The BORG 55mm F3.6 Astrograph is a very unique portable telescope. Boasting a small size for easy transportation (including airline and overseas expeditions), this astrograph is the perfect telescope for those needing a portable, high-quality optical tube.
- 55mm aperture
- 6-element advanced optical system, including one fluorite
- Japanese-made high quality carbon fiber tube
- Feathertouch Focuser - M57
- M57 camera rotator included
- Back focus : 60mm from M57 camera rotator thread
SPECIFICATIONS
| Aperture | 55 mm (2.25") |
|---|---|
| Back Focus | 60mm |
| Corrected Image Circle | 43mm |
| Dawes Limit | 2.11 arcseconds |
| Focal Length | 200 mm |
| Focal Ratio | f/3.64 |
| Highest Magnification | 110x |
| Light Gathering Power | 62x |
| Limiting Magnitude | 12.5 |
| Optical Design | Petzval |
| Tube Diameter | 80mm |
| Tube Length | 210mm |
| Tube Weight | 2.7 lbs |
INCLUDED ITEMS
- BORG 55FL F3.6ED Astrograph Optical Tube
- M57 camera rotator
- Feathertouch Focuser - M57
- Reviews
- Questions
United StatesI appreciate the tough design challenges to pack so much into a compact, wide-field scope. I'm an experienced imaging with longer focal length scopes, so this was a challenge. Getting a flat-field across entire image circle is challenging, but with persistence I have it acceptable (very slight star elongation in one corner but can live with it for now, haven't had time to debug/test what is wrong if it is tilt or backfocus wrong on my adapters). Adapters for the scope are available, although M57 is not a popular size so very limited adapters other than from Hutech. I think this will be a keeper in my collection.