We are adding many refractors from Takahashi and Borg to our website daily. If you don’t see what you want here, call OSI for availability.
Refractors over 139mm (5)
Refractors 127-138mm (1)
Refractors under 127mm (21)
Borg 107FL F6 Astrograph Set FTF-M57 Focuser, 107mm Fluorite$3,299.00Borg 107FL F6 Astrograph Set FTF-M57 Focuser, 107mm FluoriteJared SmithAugust 18, 2020
Borg 107FL FTF-3235 Visual Set w/ Feather Touch Focuser, 107mm Fluorite$3,895.00
BORG 107FL with FTF true 3″ focuser (FTF-3235). EMS/EZM-ready package.
This system allows to reach the focus with long light path erecting mirror diagonals like Matsumoto EMS and BinoTechno EZM as well as conventional 2″ diagonalsBorg 107FL FTF-3235 Visual Set w/ Feather Touch Focuser, 107mm FluoriteJared SmithSeptember 22, 2020
Borg 107FL OTA Set CR, Carbon Fiber Tube + Rack & Pinion Focuser, 107mm Fluorite$3,395.00Borg 107FL OTA Set CR, Carbon Fiber Tube + Rack & Pinion Focuser, 107mm FluoriteJared SmithAugust 7, 2020
Borg 55FL F3.6 Astrograph Set A, 55mm Fluorite$1,299.00
Borg 55FL F3.6 Astrograph Set A, 55mm FluoriteJared SmithSeptember 10, 2020
- Aperture : 55mm Fluorite apochromat
- Focal length : 200mm
- F-ratio : 3.6
- Lens configuration : 6 elements in 5 groups
- Coating : Fully multi-coated
- Physical length : 200mm
- Tube diameter : 60mm
- Weight : 0.6kg
- Filter : 58mm (front hood) & 52mm (7000)
- Parts included : 2555, 7761, 7604, 7880 & 7000
Borg 55FL F3.6 Astrograph Set B, 55mm Fluorite, w/ helical focuser$1,575.00
Borg 55FL F3.6 Astrograph Set B, 55mm Fluorite, w/ helical focuserJared SmithSeptember 22, 2020
- Telescope Aperture: 55mm
- Telescope Focal Ratio: f/3.6
- 43mm corrected image circle
Borg B90FTF4 F4 Astrograph Set w/ Feather Touch Focuser, 90mm Fluorite$2,999.00Borg B90FTF4 F4 Astrograph Set w/ Feather Touch Focuser, 90mm FluoriteJared SmithSeptember 22, 2020
Takahashi FC-100DF Refractor OTA$2,440.00
The Takahashi FC-100D is Takahashi’s latest update to the 100mm fluorite refractor. The FC-100D uses the Steinheil design with the fluorite element in the rear and an eco-glass front element. This apochromatic telescope provides outstanding views, both visually and with digital imaging hardware.
Takahashi FC-100DF Refractor OTAJoyce EldridgeMarch 6, 2020
- Great for visual and astrophotography
- Optional accessories for planetary and deep space imaging
- Larger 100 mm aperture great high contrast views
- Excellent for viewing galaxies, globular clusters, nebulae, and planets
- Rear Flourite element for optimum color correction
Takahashi FC-76DS Refractor OTA$1,780.00
The FC-76DS model features a the Sky-90 2.6 focuser to better hold imaging packages which include DSLRs and CCD cameras with filter wheels. An optional dedicated flattener as well as extender are available to further enhance the capabilities of the FC-76DS. A sliding dew shield is also included and a larger OD 90 mm tube is standard.
The optional dedicated reducer changes the focal length to 417 mm with a focal ratio of f/5.5 and an image circle of 36 mm. The dedicated flattener operates at f/7.8 and 594 mm produces a 40 mm flat circle. This telescope is exceptionally well-suited for solar eclipse imaging and can be carried by the Teegul Sky Patrol III or larger PM-1mount. When picking out accessories for any Takahashi telescope, a system chart is of great use.Takahashi FC-76DS Refractor OTAJoyce EldridgeMarch 6, 2020
Takahashi FC100DC Refractor OTA$2,230.00
Like the FS series, the FC series are apochromatic refractors with two-element fluorite lenses. The FC series have larger apertures and longer focal lengths than the FS series, and provide outstanding performance both for the visual observer and the digital imager. The FC series has its own dedicated set of reducers and flatteners, and is also able to use some of these accessories from the TOA series.
The FC-100DC model features a fixed dew shield and a 2.2 inch rack and pinion focuser. While a capable imaging instrument, it is designed with the visual observer in mind.Takahashi FC100DC Refractor OTAJoyce EldridgeMarch 6, 2020