Takahashi FC-100DF Fluorite Doublet APO f/7.4
The Takahashi FC-100DF apochromatic refractor is designed around a fluorite doublet at F/7.4. It is equipped with a 50.8 mm rack-and-pinion focuser, larger than that of the FC-100DC, allowing the mounting of heavier cameras. Its use remains very versatile and even a small mount will make it possible to exploit its full potential.
If you want to make astrophotography at the native focal length of the refractor, a field corrector is available. 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 50.8 mm focuser. The use of the latter is recommended for cameras or APNs equipped with APS-C or higher sensors.
Technical Specifications
| CHARACTERISTIC |
TAKAHASHI FC-100DF REFRACTOR |
| Objective |
Fluorite doublet apochromat |
| Lens cell |
Air-spaced doublet. Fluorite in the back |
| Coatings |
Hard multicoatings |
| Diameter |
100 mm |
| Focal length |
740 mm |
| Focal ratio |
F/7.4 |
| Metal Back Distance |
223 mm |
| Focal length |
770 mm |
| Focal ratio |
F/7.7 |
| Image circle diameter |
35 mm |
| Metal Back Distance |
56.2 mm |
| Focal length |
757 mm |
| Focal ratio |
F/7.6 |
| Image circle diameter |
44 mm |
| Metal Back Distance |
71.2 mm |
| Focal length |
540 mm |
| Focal ratio |
F/5.4 |
| Image circle diameter |
30 mm |
| Backfocus |
56.2 mm |
| Focal length |
480 mm |
| Focal ratio |
F/4.8 |
| Image circle diameter |
44 mm |
| Metal Back Distance |
74.1 mm |
| Focal length |
1185 mm |
| Focal ratio |
F/11.9 |
| Metal Bck Distance |
157 mm |
| Focal length |
1480 mm |
| Focal ratio |
F/D 14,8 |
| Metal Back Distance |
73 mm |
Takahashi FC-100DF refractor
| CHARACTERISTIC |
TAKAHASHI FC-100DF REFRACTOR |
| Length of the optical tube |
785 mm (with fixed dew-shield) |
| Diameter of the optical tube |
95 mm |
| Diameter of the dew-shield |
124 mm |
| Weight |
3.6 kg |
| Focuser |
Rack-and-pinion |
In the Box
Optical Tube Assembly
F50.8 AD Ring TKP19001
50.8 Sleeve TKP00113
Coupling (s) TKP00103
Eyepiece adapter (31.7) TKP00101
Eyepiece adapter (50.8) TKP27110
Extension Tube L (50.8) TKP31112
Manual & Warranty
System-chart of Takahashi FC-100DF telescope
System-chart of Takahashi FC-100DF refractor with FC-35RD
System-chart of Takahashi FC-100DF refractor with Extender Q 1.6X
System-chart of Takahashi FC-100DF refractor with Extender C2X
Takahashi 5-Years Warranty
