TAKAHASHI
The Takahashi FC-100DF apochromatic refractor is designed around a fluorite doublet at F/7.4. Its use remains very versatile and even a small mount will make it possible to exploit its full potential.
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FC-100DF (OTA) WITH 50.8/31.75 ADAPTER
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.
Καθ.Βάρος (γρ.) | 3600 |
---|---|
Οπτικός Σχεδιασμός | Διοπτρικό Αποχρωματικό |
Διάμετρος (mm) | 100 |
Εστιακή Απόσταση - F (mm) | 740 |
Εστιακός Λόγος (f/) | 7.4 |
Στήριξη | Δεν περιλαμβάνεται στήριξη ή τρίποδας |
Μέγιστη Ωφέλιμη Μεγέθυνση (x) | 200 |
Characteristic | Takahashi FC-100DF refractor |
Objective | Fluorite doublet apochromat |
Lens cell | Air-spaced doublet. Fluorite in the back |
Coatings | Hard multicoatings |
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 |
Focuser | Rack-and-pinion |
At prime focus | |
Focal length | 740 mm |
Focal ratio | F/7.4 |
Metal Back Distance | 223 mm |
With 76D-FL field corrector | |
Focal length | 770 mm |
Focal ratio | F/7.7 |
Image circle diameter | 35 mm |
Metal Back Distance | 56.2 mm |
With FC/FS MFL1.04X field corrector | |
Focal length | 757 mm |
Focal ratio | F/7.6 |
Image circle diameter | 44 mm |
Metal Back Distance | 71.2 mm |
With 76D RD focal reducer | |
Focal length | 540 mm |
Focal ratio | F/5.4 |
Image circle diameter | 30 mm |
Backfocus | 56.2 mm |
With FC-35RD focal reducer | |
Focal length | 480 mm |
Focal ratio | F/4.8 |
Image circle diameter | 44 mm |
Metal Back Distance | 74.1 mm |
With EX-Q1.6X focal extender | |
Focal length | 1185 mm |
Focal ratio | F/11.9 |
Metal Bck Distance | 157 mm |
With C2X focal extender | |
Focal length | 1480 mm |
Focal ratio | F/D 14,8 |
Metal Back Distance | 73 mm |
Spot-diagram of Takahashi FC-100D refractor at prime focus
Spot-diagram of Takahashi FC-100D refractor with 76D FL field corrector
Spot-diagram of Takahashi FC-100D refractor with FC/FS MFL1.04X field corrector
Spot-diagram of Takahashi FC-100D refractor with FC-35RD focal reducer