DESCRIPTION
The Takahashi FC-76DCU apochromatic refractor is equipped with a fluorite doublet at F/7.5. Its very low weight, only 1.9 kg for the tube alone, makes it a very portable instrument, usable on a simple photo tripod. It comes with a fixed dew shield and a 31.75 mm compact rack-and-pinion focuser inherited from the FS-60CB. A brake locks the focus and it is possible to add an optional Camera Angle Adjuster (CAA) to make it easier to frame the picture.
The FC-76DCU can be equipped with a focal reducer (76D-RD) or with a field corrector (76D-FL or multi-flattener FC/FS MFL1.04X) for deep sky imaging.
The 80 mm diameter tube is in 2 parts. It can receive the Extender 1.7XR from the FS-60Q, which increases the F/D ratio from 7.5 to 12.75. The focal length gain then allows optimal chromatic correction for unforgettable planetary observations.
For FS-60CB owners, there is a conversion kit available to convert this refractor to FC-76DCU.
CHARACTERISTICS
Takahashi FC-76DCU Refractor
| CHARACTERISTIC |
TAKAHASHI FC-76DCU REFRACTOR |
| Objective | Fluorite doublet apochromat |
| Lens cell | Air-spaced doublet. Fluorite in the back. |
| Coatings | Hard multicoatings |
| Diameter | 76 mm |
| AT PRIME FOCUS | |
| Focal ratio | 570 mm |
| Focal ratio | F/7.5 |
| Metal Back Distance | 159 mm |
| WITH FC/FS MFL1.04X FIELD CORRECTOR | |
| Focal length | 589 mm |
| Focal ratio | F/7.8 |
| Image circle diameter | 44 mm |
| Metal Back Distance | 85.2 mm |
| WITH 76D RD FOCAL REDUCER | |
| Focal length | 417 mm |
| Focal ratio | F/5.5 |
| Image circle diameter | 36 mm |
| Metal Back Distance | 56.2 mm |
| WITH EX-Q1.6X FOCAL EXTENDER | |
| Focal length | 916 mm |
| Focal ratio | F/12 |
| Metal Back Distance | 157 mm |
| WITH 1.7XR FOCAL EXTENDER | |
| Focal length | 969 mm |
| Focal ratio | F/12.8 |
Takahashi FC-76DCU Refractor
| CHARACTERISTIC | TAKAHASHI FC-76DCU REFRACTOR |
| Length of the optical tube | 656 mm (with dew-shield) |
| Diameter of the optical tube | 80 mm |
| Diamètre of the dew-shield | 80 mm |
| Weight | 1.9 kg |
| Focuser | Rack-and-pinion |
Spot-diagram of the Takahashi FC-76DS refractor at prime focus
Spot-diagram of the Takahashi FC-76DS refractor with FC/FS MFL1.04X field corrector
Spot-diagram of the Takahashi FC-76DS refractor with 76D-RD focal reducer
DOCUMENTATION
System-Charts
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