Takahashi E-160ED, Instruction Manual

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The revolutionary Epsilon optical system uses a hyperbolic surface for the primary mirror,
coupled with a corrector in the focuser body. By combining a concave mirror and a convex
lens reducer system, the Petzval condition is achieved, resulting in a flattened image plane.
Takahashi’s unique Epsilon optical system corrects the spherical aberrations and coma for
outstanding image quality.
About the Optical System
Epsilon Performance
ی
The Epsilon ε-160ED is a new product
that further evolves Takahashi’s unique
Epsilon optical system. The newly designed
double-lens correction lens is a new type
that pursues the aberration correction
required for modern imaging sensors, and
a diffraction-limited spot image is achieved
with a star image of 3 microns out to the
edge of a full frame sensor. The smallest
star image is about 1/10 the size of the older
ε-160. In addition, the distortion aberration
(distortion), which was a drawback of the
old correction lens, has been corrected to
less than half, which makes image mosaics
easier to compose. The ε-160ED’s 530mm
(f/3.3) specification, which has the highest
level of optical performance, combined with
the lightweight and compact body, make
it an astrophotography instrument that
allows you to enjoy the very best in Epsilon
performance.
Takahashi Mirrors
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Although it is generally considered very
difficult to polish hyperbolic primary mirrors,
Takahashi has developed this technology
and evolved the production into this modern
style.
Diagonal Offset
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In order to achieve maximum illumination,
the secondary must be offset from the
center of the optical axis to produce the best
possible illumination for the image. As the
speed of the optical system increases, so
does the offset. The oversized secondary
has been offset to produce the maximum
illumination for the image.