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diagonal can be used on the Takahashi FSQ-106 refractor by removing the
diagonal’s 2” chrome barrel and replacing it with the Takahashi #TDR0200
adapter ring to accommodate the short back focus of the FSQ-106. The
diagonal can also be used on Schmidt-Cassegrain telescopes by adding a
#7785SC 2” diagonal adapter.
The diagonal uses a telescope’s
precision-polished elliptical diagonal mirror with a 40mm m.a., rather
than the more-economical rectangular mirror used on other diagonals.
Small safety stops are provided at the bottom of the 2” eyepiece holder
tube to prevent 2” eyepieces or 2” Barlows from hitting the surface of
the mirror. The mirror housing is machined from solid aluminum. The
interior of the 2” chrome barrel that fits into the focuser or visual
back is painted matte black and is internally antireflection threaded
for higher contrast. It is also threaded to accept standard 2” (48mm)
filters. There is a machined safety groove cut into the chrome barrel
which engages your telescope’s focuser thumbscrew to help keep the
diagonal from falling to the ground should the thumbscrew accidentally
loosen during use.
A supplied 1.25” adapter slips into the 2”
eyepiece holder tube of the diagonal to allow the use of 1.25”
eyepieces. Knurled thumbscrews hold eyepieces and the 1.25” adapter
securely in place. Dust covers are provided for both sides of the
Weight: The weight of this product 18 oz..