Optical tube Takahashi FC-100DC (OTA) only tube with adapter 31.75

The apochromatic telescope Takahashi FC-100DC is designed around a fluorite doublet with F/D 7.4. It is equipped with a compact 31.75 mm rack, inherited from the FS-60CB. It is much lighter than its big brother FC-100DF, only 2.8 kg compared to 3.6 kg for the FC-100DF. A small mount will be enough to get the most out of it. Designed primarily for observation, it also allows the use of small cameras for astrophotography.

Photography at the telescope's native focal length requires the 76D field corrector or the multi-flattener. The FC-100DC can also be equipped with the 76D-RD focal length reducer.

Users of large sensors, APS-C format or larger, will prefer the FC-100DF model and its dedicated focal length reducer, the FC-35RD.

Telescope Features Takahashi FS-100DC

Apochromatic lens with double fluorite lens

Air-gap lens mount. Internal fluorite.

Hard multi-coating treatments.

Useful diameter 100 mm.

At native focus.

Focal length 740 mm.

Relative aperture F/D 7.4

Backfocus 161 mm

With 76D-FL field corrector

Focal length 770 mm

Relative aperture F/D 7.7

Diameter of corrected image circle 35 mm

Backfocus 56.2 mm

With Multi-flattener FC/FS corrector MFL1.04X

Focal length 757 mm

Relative aperture F/D 7.6

Diameter of corrected image circle 44 mm

Backfocus 81.4 mm

With focal length reducer 76D RD

Focal length 540 mm

Relative aperture F/D 5.4

Diameter of corrected image circle 30 mm

Backfocus 56.2 mm

With EX-Q1.6X extender

Focal length 1185 mm

Relative aperture F/D 11.9

Backfocus 157 mm

With C2X extender

Focal length 1480 mm

Relative aperture F/D 14.8

Backfocus 73 mm

Mechanical characteristics

Feature Telescope Takahashi FC-100DC

Tube length 815 mm (fixed anti-fog)

Tube diameter 95 mm

Fogging diameter 124 mm

Weight 2.8 kg

Focusing Rack and pinion

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Focal point diagram of the Takahashi FC-100D telescope at focus

Focus point diagram of the Takahashi FC-100D telescope with the 76D FL field corrector.

Focusing point diagram of Takahashi FC-100D telescope with FC/FS MFL1.04X field corrector