The FC-76DS apochromatic refractor is equipped with a fluorite doublet at F/7.5, identical to that of the FC-76DCU. Its 95 mm diameter tube and 50.8 mm focuser allow it to support heavier cameras than its little sister can. It is equipped with a retractable dew shield which makes it more compact than the FC-76DCU with its fixed dew shield.
The FC-76DS can be equipped with a focal reducer or with a field corrector for photography. The image circle is 36 mm diameter at F/5.5 focal ratio with the flattener and 40 mm diameter at F/7.8 focal ratio with the corrector. There is also an optional Camera Angle Adjuster (CAA) for photographic framing and a microfocuser for finer focus.
This refractor is very versatile. It allows striking observations with a light and compact tube, while offering great possibilities in deep sky astrophotography.
| Characteristic | Takahashi FC-76DS refractor |
| Objective | Fluorite doublet apochromat |
| Lens cell | Air-spaced doublet. Fluorite in the back. |
| Coatings | Hard multicoatings |
| Diameter | 76 mm |
| At prime focus | |
| Focal length | 570 mm |
| Focal ratio | F/7.5 |
| Metal Back Distance | 173 mm |
| With 76D-FL field corrector | |
| Focal length | 594 mm |
| Focal ratio | F/7.8 |
| Image circle diameter | 40 mm |
| Metal Back Distance | 56.2 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 |
| Characteristic | Takahashi FC-76DS refractor |
| Length of the optical tube | 660 mm (567 mm with retracted dew shield) |
| Diameter of the optical tube | 95 mm |
| Diameter of the dew shield | 114 mm |
| Weight | 3 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 76D-FL field corrector
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
| System-chart of Takahashi FC-76DS refractor | Télécharger |
| System-chart of Takahashi FC-76DS refractor with Extender-C2X | Télécharger |
| System-chart of Takahashi FC-76DS with Extender-Q1.6X | Télécharger |
| Instruction manual of Takahashi FC-76DS telescope | Télécharger |
