TAKAHASHI FS-60CB DOUBLET OTA
Takahashi
Apochromatic doublet
60 mm
f/5.9
355 mm
1.4 kg
TAKAHASHI FS-60CB DOUBLET OTA - OTA Only is backordered and will ship as soon as it is back in stock.
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The Takahashi FS-60CB 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 FS-60CB into a full-frame compatible widefield astrograph.
The FS-60CB is equipped with a precise rack and pinion focuser designed with imaging in mind. The FS-60CB has a native focal length of 355mm and a focal ratio of f/5.9, 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), including a 0.72x reducer and 1.6x extender, which transforms the FS-60CB into the f/10 FS-60Q.
Note: The OTA ONLY variant does not include tube rings or a dovetail bar. For the FS-60CB, you can use the PrimaLuceLab 80mm PLUS tube rings in combination with the PrimaLuceLab 240mm Vixen bar.
Spot diagram of Takahashi FS-60CB at prime focus.
Spot diagram of Takahashi FS-60CB with FL-FS-60C field flattener.
Spot diagram of Takahashi FS-60CB with FC/FS MFL1.04x field flattener.
Spot diagram of Takahashi FS-60CB with RD-C0.72x focal reducer.
| Optical design | Fluorite doublet apochromat |
|---|---|
| Lens cell |
Air-spaced doublet, 1 x fluorite lens |
| Coatings |
Hard multicoatings |
| Objective diameter |
60 mm |
| Focal length at prime focus |
355 mm |
| Focal ratio at prime focus |
F/5.9 |
| Backfocus distance at prime focus |
162 mm |
| Dew shield diameter | 80 mm |
| Tube diameter | 80 mm |
| Tube length | 440 mm |
| Tube weight | 1.4 kg |
| SKU | TSK06210 |
| Prime focus focal length | 355 mm |
|---|---|
| Prime focus focal ratio |
F/5.9 |
| Prime focus backfocus distance |
162 mm |
| FL-FS-60C flattener focal length |
370 mm |
|
FL-FS-60C flattener focal ratio |
F/6.2 |
|
FL-FS-60C flattener backfocus distance |
56.2 mm |
|
FL-FS-60C flattener image circle |
45 mm |
| FC/FS MFL 1.04x flattener focal length | 370 mm |
| FC/FS MFL 1.04x flattener focal ratio | F/6.2 |
| FC/FS MFL 1.04x flattener backfocus distance | 56.2 mm |
| FC/FS MFL 1.04x flattener image circle | 45 mm |
| RD-C 0.72x reducer focal length |
255 mm |
|
RD-C 0.72x reducer focal ratio |
F/4.2 |
|
RD-C 0.72x reducer backfocus distance |
56.2 mm |
|
RD-C 0.72x reducer image circle |
40 mm |
| FS-60Q 1.6x extender focal length | 600 mm |
| FS-60Q 1.6x extender focal ratio | F/10 |
| FS-60Q 1.6x extender backfocus distance | 158.4 mm |
