Takahashi TKA20420W - 80WB Double Clamps
A pair of Takahashi 80WB collars for this telescope. The 220B dovetail for the mount is sold separately.
CHF 146.06
Takahashi FC-76DCU Telescope (Tube Only): 76 mm fluorite doublet, native focal length of 570 mm at f/7.5, and a two-piece collapsible tube. Part number TFK07640.
CHF 1'149.79incl. Swiss VAT
Reference TFK07640
The Takahashi FC-76DCU is a 76-mm apochromatic telescope designed for astronomical observation and photography. Its air-spaced, multi-coated fluorite doublet offers a native focal length of 570 mm at f/7.5. The tube splits into two parts for easy transport.
The compact rack is compatible with 31.75 mm slide-on accessories and features a focus lock. The tube has a diameter of 80 mm. The anti-fog screen is fixed.
For imaging, a field corrector or the optional 76D-RD reducer can be used to complete the setup. The adapters and the distance to the sensor are selected based on the specifications of the chosen field corrector. An optional rotating collar makes framing easier.
FC-76DCU optical tube with objective lens, anti-fog cover, and rack-and-pinion focus mechanism. The finder scope, its mount, and the mounting clamp must be purchased separately for this tube-only version.
Takahashi Manufacturer's Documentation
These accessories are sold separately from the optical tube. For a photographic setup, be sure to use the connectors and spacing specified for your chosen configuration.
The Takahashi FC-76DCU is a 76-mm-aperture fluorite doublet refractor with a focal length of 570 mm (f/7.5), designed primarily for deep-sky astrophotography. Its focal length is ideal for medium-sized nebulae (Orion, the Lagoon, the Trifid, and the Rosette), large galaxies such as M33 or the M81-M82 pair, and star clusters. At f/7.5, its classic aperture-to-focal-length ratio requires slightly longer exposure times, but in exchange yields very fine star details.
With an APS-C camera featuring 3.76 µm pixels (Sony IMX571 sensor), you get approximately 1.36″ per pixel for a field of view of 2.4° × 1.6°. With the 0.85× crop factor, this increases to 1.6″ per pixel and a field of view of 2.8° × 1.9°.
Yes, whenever you're using an APS-C or full-frame sensor: like any uncorrected doublet lens, it has a slight field curvature that stretches the stars in the corners. Dedicated correctors: Takahashi Multi Reducer 0.85×-L for FC-76D (equivalent focal length of 484 mm, f/6.4); Takahashi TKA00582: 1.04x MFL FC/FS Corrector.
159 mm (metal back); 75 mm with MFL 1.04×; 56 mm with 76D RD 0.85×. This focal length is measured from the thread to the sensor, including rings, filter wheel, and filter drawer: adhering to this measurement down to the millimeter ensures that stars remain round in the corners.
The tube weighs about 1.9 kg; with the camera, filter wheel, and guide scope, expect it to weigh around 3.4 kg: a small equatorial or harmonic travel mount is sufficient. A refractor requires no collimation: once balanced, it’s ready to use as soon as it reaches operating temperature. At 65.6 cm long, it fits easily in the trunk.
Yes, as a bonus: with an angled mirror and an eyepiece, it provides high-contrast, color-accurate images of the Moon, the planets, and double stars, up to about 152×.
Here are a few accessories we've selected for this model, depending on your needs.
A pair of Takahashi 80WB collars for this telescope. The 220B dovetail for the mount is sold separately.
Vixen Takahashi 220B dovetail for 80WB clamps, sold separately. Check your mount's clamping mechanism and balance.
Optional top plate for Takahashi 80WB mounts, for attaching accessories. Mounts and lower dovetail sold separately; check spacing, clearance, and balance.
Optional 100 upper bridge for the two 80WB clamps, sold separately. Takahashi confirms their compatibility even though the product sheet lists 95WB. An alternative to the 220B bridge, distinct from the lower dovetail.
0.85×-L Reducer for FC-76DCU: 486 mm focal length and f/6.4 photographic configuration. Check the photographic connections and alignment according to the Takahashi diagram.
1.04× FC/FS corrector for the FC-76DCU, an alternative to the reducer. Be sure to use the CA-76 TKA18203 Multi ring and check the connections and focus according to the Takahashi diagram.
Extender-Q 1.6× to increase the focal length and magnification. Check the connections according to the Takahashi diagram; the 50.8 mm TKA00596 adapter may be required depending on the mount.
Takahashi 80QS one-piece clamp, an alternative to the two 80WB clamps sold separately. It is included in the FC-76DCU accessory pack, but not with this tube alone; check the mounting and balancing.
Recommended diameter: 125 mm. Check the measurement and the mounting.
Recommended diameter: 150 mm. Check the measurement and the mounting.
