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Takahashi Epsilon Extender 1.5X E-130D

Takahashi has released a series of 1.5X extenders for the Epsilon series of telescopes. Models for the Epsilon-130D and Epsilon-180ED are available for immediate purchase with delivery of the initial units expected in May. The model for the Epsilon-160ED will be available later in 2021.


The extenders provide a 1.5 times increase in focal length and are comprised of 7 optical elements in 5 groups. This design provides ultra-high performance that corrects coma aberration on each the model of Epsilon telescopes. Even at the extended focal length, the star image is equal to or better than that obtained at the native focal length of the telescope.


In all models, the extender provides an RMS spot size of 2 microns or less at the center of the field, and 8 microns or less at the diameter of a full frame sensor (44 mm). Spot diagrams for the three models are attached to this announcement.


Below are other technical details of the new extender for the Epsilon-130D and Epsilon-180ED models. Details for the Epsilon-160ED will be announced separately.



εExtender 130D

εExtender 180ED




Focal Length



F value



Image circle



Optical System

5 elements 7 groups

5 elements 7 groups

Maximum diameter total length



OTA side thread

M60 P-0.75

M68 P=0.75

Camera side thread

M54 P=0.75

M54 P=0.75





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