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37
your usual astronomy store you can find Barlow lenses and
optical path corrector lenses, either "Focal Point
Extenders" or "Path Correctors" for telescopes and
focusers with little focal travel range, or with back-focus
limitations. In the specific case of Newton-type telescopes,
there are several manufacturers of "Coma" corrective
lenses that further extend the focal length of the telescope
by solving the "back-focus" limitations.
Optics such as "Barlows", "Focal Point Extenders" and
"Path Correctors" with focal length extension should be
installed by replacing the (A) 2” barrel in the ROTARION.
AstronSCIENTIFIC cannot recommend specific optics (B) to
increase focal travel due to the enormous number of
eyepiece combinations, its later leveling through the
“Extenders” in the ROTARION and the specific back focus
needs of each telescope. At your usual specialized store,
they can recommend the optics that suits your specific
needs of your telescope.
To reach focus in refractors and Newtonians a 2-inch
Barlow (B) x2, x3 x4 or a combination of them works fine.
(A)
(B)
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