The Takahashi FC-100DZ apochromatic refractor has a different design from the FC-100DC/DF. It has a fluorite doublet with a slightly extended focal length, 800 mm instead of 740 mm. The color correction is further improved and the results are closer to the best instruments of the brand. This lens modification makes the FC-100DZ one of the most powerful and versatile 100mm scopes on the market.
It is equipped with a 50.8 mm rack and pinion focuser, identical to the FC-100DF's one, allowing the mounting of heavier cameras. Its use is still very general purpose and even a small mount will allow its full potential to be exploited.
If you wish to take pictures at the native focal length of the refractor, a field corrector is available (the multi-flattener FC/FS 1.04X). It can also be equipped with a focal reducer: either the 76D-RD model normally intended for the small focuser, or the FC-35RD model, specific to the FC-100DF and its 50.8mm focuser. The use of the latter is recommended for cameras or DSCs equipped with APS-C or higher.
| Characteristic | Takahashi FC-100DZ refractor |
| Objective | Fluorite doublet apochromat |
| Lens cell | Air-spaced doublet. Fluorite in the back |
| Coatings | Hard multicoatings |
| Diameter | 100 mm |
| At prime focus | |
| Focal length | 800 mm |
| Focal ratio | F/8 |
| Metal Back Distance | 223 mm |
| With FC/FS MFL1.04X field corrector | |
| Focal length | 820 mm |
| Focal ratio | F/8.2 |
| Image circle diameter | 44 mm |
| Metal Back Distance | 71.2 mm |
| With 76D RD focal reducer | |
| Focal length | 580 mm |
| Focal ratio | F/5.8 |
| Image circle diameter | 30 mm |
| Metal Back Distance | 56.2 mm |
| With FC-35RD focal reducer | |
| Focal length | 530 mm |
| Focal ratio | F/5.3 |
| Image circle diameter | 44 mm |
| Metal Back Distance | 68.8 mm |
| With EX-Q1.6X focal extender | |
| Focal length | 1185 mm |
| Focal ratio | F/11.9 |
| Metal Back Distance | 157 mm |
| Characteristic | Takahashi FC-100DZ refractor |
| Length of the optical tube | 840 mm (770 mm with retracted dew shield) |
| Diameter of the optical tube | 95 mm |
| Diameter of the dew shield | - |
| Weight | 3.9 kg |
| Focuser | Rack-and-pinion |
Spot-diagram of Takahashi FC-100DZ refractor at prime focus
Spot-diagram of Takahashi FC-100DZ refractor with FC/FS MFL1.04X field corrector
Spot-diagram of Takahashi FC-100DZ refractor with FC-35RD focal reducer
| System-chart of Takahashi FC-100DZ refractor | Télécharger |
| System-chart of Takahashi FC-100DZ with FC-35RD | Télécharger |
| System-chart of Takahashi FC-100DZ with Extender Q 1.6X | Télécharger |
| Takahashi FC-100DZ instruction manual | Télécharger |
