Reducer / Corrector f/6.3 – with 2 inch internal thread (not for Edge-HD)
This sensible lens correction system kills several birds at the same time
with one stone: The 4-lens Focal Reducer shortens the focal length
of all Schmidt-Cassegrain telescopes by a factor of 0.63. That
The aperture ratio changes to the same extent from 1:10 to 1:6.3.
This results in a much larger field of view and around the
Factor 3 shorter exposure times. The optical correction system paves
the slightly curved field of view of all Schmidt-Cassegrain telescopes.
This is a fully corrected, vignetting-free “richfield”
field of view of 24 mm in diameter. The focal lengths of
Celestron SC – Telescopes are changing as follows:
C-5: from 1250 to 788 mm / f6.3
C-8: from 2000 to 1260 mm / f6.3
C-9: from 2350 to 1480 mm / f6.3
C-11: from 2800 to 1764 mm / f6.3
C-14: from 3910 to 2457 mm / f7.3
The Celestron Focal Reducer can also be visually useful
insert. It has the Celestron SC thread on both sides, and
is screwed directly to the tube of the telescope. He can also in
Combination with the Radial Guider – for photography and CCD cameras
be used.