65D FU 0.65× Reducer for FCT-65D: 260 mm focal length at f/4, 44 mm corrected image circle, and CA-35 FURD adapter included.
CHF 799.00incl. Swiss VAT
Part Number TKA11580F
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The 65D FU reducer shortens the focal length of the FCT-65D to 260 mm at f/4, allowing you to frame large nebulae and expansive star fields. Its corrected 44 mm image circle covers the 24 × 36 mm format. Its optical design consists of four elements in four groups, including one fluorite element, to correct aberrations in the lens-reducer combination.
This model is designed for the FCT-65D. Its body fits into the focusing tube and is secured with an M64 × 0.75 male thread. The CA-35 FURD camera adapter is included. To install it, unscrew this pre-assembled adapter, attach the telescope’s CAA-S rotating collar, and then screw the CA-35 back on behind it. The M52 × 0.75 male output then provides a backfocus of 56 mm. The ring for your camera or video camera should be selected based on this interface and the distance to the sensor.
| Features | Value |
|---|---|
| Reference | TKA11580F |
| Factor | 0,65× |
| Instrument | FCT-65D |
| Resulting focus | 260 mm |
| Focus report | f/4 |
| Corrected image circle | 44 mm |
| Optical package | 4 lenses in 4 groups, including one made of fluorite |
| Backfocus with CAA-S and CA-35 FURD | 56 mm |
