DESCRIPTION
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.
CHARACTERISTICS
|
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 |
Takahashi FC-76DS refractor
|
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
Documentation
System-Charts
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