TAKAHASHI FC-76DS DOUBLET OTA
TAKAHASHI FC-76DS DOUBLET OTA - OTA Only is a special order item. Contact us for more info.
The Takahashi FC-76DS is a Fluorite apochromatic doublet refractor which excels as a mobile instrument for visual and photographic use. The air-spaced fluorite doublet has excellent chromatic correction across the visual spectrum. The optional field flatteners and focal reducers transform the FC-76DS into a widefield astrograph.
The FC-76DS is equipped with a precise rack and pinion focuser designed with imaging in mind. The FC-76DS has a native focal length of 570mm and a focal ratio of f/7.5, making it a versatile instrument for both terrestrial and astronomical use.
A selection of different field correctors are available to suit different applications (sold separately).
Note: The OTA ONLY variant does not include tube rings or a dovetail bar. For the FC-76DS, you can use the PrimaLuceLab 95mm PLUS tube rings in combination with the PrimaLuceLab 240mm Vixen bar.
Specifications
| Optical design | Fluorite doublet apochromat |
|---|---|
| Lens cell |
Air-spaced doublet, 1 x fluorite lens |
| Coatings |
Hard multicoatings |
| Objective diameter |
76 mm |
| Focal length at prime focus |
570 mm |
| Focal ratio at prime focus |
F/7.5 |
| Backfocus distance at prime focus |
173 mm |
| Dew shield diameter | 114 mm |
| Tube diameter | 95 mm |
| Tube length | 660 mm with dew shield extended, 567 mm with dew shield retracted |
| Tube weight | 3 kg |
| SKU | TFK07610 |
Measurements
| Prime focus focal length | 570 mm |
|---|---|
| Prime focus focal ratio |
F/7.5 |
| Prime focus backfocus distance |
173 mm |
| 76D-FL flattener focal length |
594 mm |
|
76D-FL flattener focal ratio |
F/7.8 |
|
76D-FL flattener backfocus distance |
56.2 mm |
|
76D-FL flattener image circle |
40 mm |
| FC/FS MFL 1.04x flattener focal length | 589 mm |
| FC/FS MFL 1.04x flattener focal ratio | F/7.8 |
| FC/FS MFL 1.04x flattener backfocus distance | 85.2 mm |
| FC/FS MFL 1.04x flattener image circle | 44 mm |
| 76D-RD reducer focal length |
417 mm |
|
76D-RD reducer focal ratio |
F/5.5 |
|
76D-RD reducer backfocus distance |
56.2 mm |
|
76D-RD reducer image circle |
36 mm |
| EX-Q 1.6x extender focal length | 916 mm |
| EX-Q 1.6x extender focal ratio | F/12 |
| EX-Q 1.6x extender backfocus distance | 157 mm |
Downloads
 FC-76DS instruction manual
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