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just introduced an updated version of the original FC-100 now called the
FC-100D. It has been designed for the digital age. The FC-100D uses the
Steinheil design with the fluorite element in the rear and an eco-glass
front element. The focal ratio has been reduced to f/7.4 with a 740mm
was designed with a goal of being light weight and highly portable. It
is offered in two light weight models: the ultra-portable DC visual
model that weighs just 2.8kg [6.1lbs] uses the 2.2”FS-60CB focuser.
While the DF model uses the 2.7” focuser and is designed to be used for
imaging as well as visual using the dedicated four element FC-35 .66x
new reducer that changes the focal ratio to f/4.9 with a Ø 44mm circle
at a focal length of 485mm.
The FC-100DC model features a fixed dew shield and a 2.2 inch rack
and pinion focuser. While a capable imaging instrument, it is designed
with the visual observer in mind.
The FC-100DF is optically identical to the DC model, but features an
enhanced 2.7–inch focuser. It also features a shorter tube length that
provides additional back focus for digital imaging applications. This
added back focus allows use of the FC-35RD reducer, which converts the
DF to an f/5.4 instrument.
The FC-100DL is a full-fledged long focal length apochromatic
refractor from Takahashi. This is the same FC-100DL that was offered in
limited quantities in previous years. With the exception of the focal
length, it is identical to the FC-100DF.