A Compact Astrograph for Wide Fields
The Epsilon-130D combines a 130-mm diameter with a 430-mm focal length and an F/D ratio of 3.3. This short focal length is well-suited for photographing extensive nebulae and wide-field star fields. Part number TEK13010 refers to the optical tube only; it must be paired with your own mount and imaging equipment.
A field corrected for photography
The hyperbolic primary mirror works with a plane secondary mirror and a corrector integrated into the rack. This modified hyperbolic Newtonian design provides a corrected image circle of 44 mm. The corrector is part of the tube’s optical system; the photographic adapters are selected based on the camera or body being used.
Set up the camera rig
The 56.2 mm backfocus defines the working distance to be maintained according to the Takahashi scheme. The rings, filter holder, and housing must be taken into account in this calculation, as well as in the available aperture diameter for the sensor. The wide-field T rings and the 1.5× Epsilon extender specific to the 130D are separate options from the native configuration.
Framing, Adjustment, and Transport
The rotating collar integrated into the rack allows you to adjust the field of view. The reinforced spider supports the secondary mirror and minimizes flexing. Markings on both mirrors allow you to check collimation during the day using the appropriate Takahashi tools, following the procedure for the 130D.
Selecting the Correct Size for the Fastener and Mount
The tube is 460 mm long and 166 mm in diameter, with a mass of 4.9 kg. Its front end has a diameter of 188 mm. To select the mount and balance the setup, add the mass of the clamps and the camera assembly to that of the tube.
Accessories for Your System
- Check the collimation: combine the cross-linked tube TKA00442 at the’TKA00441 collimation eyepiece. The Epsilon-130D diagram shows visual adapter #10, tube #19, ring #14, 31.75 mm eyepiece holder #46, and then collimation eyepiece #29. Remove the corrector for this adjustment, then reinstall it according to the manual before imaging.
- Secure the tube: visit 166WS TKA69420S Double Clamps are designed for the Epsilon-130D. The top plate is included in this set; the bottom plate or dovetail must be purchased separately. Takahashi recommends the M TMP02200 plate. Any other interface must conform to the hole patterns and center distances of the clamps and the mount.
Package Contents and Setup
Epsilon-130D optical tube (TEK13010) with built-in corrector. The mount, camera, clamps and their mounts, T-ring, and extender must be selected separately. The collimation tools listed above are optional.
Takahashi TEK13010 Official Spec Sheet ; Takahashi 2025 Catalog, PDF page 33.