A dedicated extender for the Epsilon-180ED, designed to extend its focal length to 770 mm at f/4.3. It has a corrected image circle of 44 mm and a sensor distance of 56.2 mm.
CHF 985.03incl. Swiss VAT
Part Number TKA68595
Will be ordered for you
Delivery time: 5 to 7 business days
Estimated shipping: Between November 23 and 24, 2026
The Takahashi TKA68595 extender increases the focal length of the Epsilon-180ED from 500 to 770 mm. This allows small objects to take up more space in the image, with a resulting aperture ratio of f/4.3.
Its specialized design, consisting of seven elements in five groups, corrects coma across a 44-mm image circle, suitable for the 24 × 36-mm format. The manufacturer also recommends visual use with the mounts indicated on the instrument’s diagram.
The set includes the extender’s two optical units: the corrector unit and the master unit, shown assembled in the photograph. It is mounted in place of the tube’s original corrector. This version is designed specifically for the Epsilon-180ED.
The input has an M68x0.75 male thread, and the output has an M54x0.75 female thread. The working distance to the sensor is 56.2 mm. For a camera, be sure to use the Takahashi wide-field adapter ring appropriate for its mount, sold separately. The assembly diagram specifies the connectors to use and the reference point from which this distance is measured.
For filtration, Takahashi Europe recommends an internal filter or a camera filter wheel: an M48 filter screwed into the extender may cause reflections. With this setup, the filter is no longer mounted in the standard wide-field ring. Be sure to account for the thickness of the camera and filter wheel adapters in your mounting design.
| Features | Value |
|---|---|
| Reference | TKA68595 |
| Resulting focus | 770 mm |
| Resulting F/D ratio | F/D 4.3 |
| Corrected Image Circle Diameter | 44 mm |
| Backfocus | 56.2 mm |
| Compatible instruments | Takahashi Epsilon-180ED |
| Design | 7 lenses in 5 groups |
| Mechanical Input Interface | M68x0.75 male thread |
| Mechanical Output Interface | M54 x 0.75 female |
| Mechanical draw | 45.2 mm |
| Mechanical diameter | 78.5 mm |
| Mechanical Length | 105.5 mm |
| Weight | 550 g |
| Composition | Correction Unit and Master Unit of the Extender |
Here are a few accessories we've selected for this model, depending on your needs.
Epsilon-180ED, tube sold separately. This extender is specific to this model and replaces the original corrector. Check the connections, assembly, and focus according to the Takahashi diagram. A filter screwed into the extender may cause reflections; the manufacturer recommends using an internal filter or a filter wheel instead.
