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4" Ritchey-Chrétien Reducer Corrector 0.84x |
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| Product Futures: |
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| - Corrector corrects for both coma and
curvature of field. |
| - Optimized for CCD arrays which will fit
within a circle of diameter 60mm. |
| - Optimized for a bandwidth of 400nm to
>700nm. |
| - OAL (over-all length) = approximately 75mm. |
| - OD of lens cell = 122mm (4.8") |
- FFD = approximately 86.5mm = The
location of CCD focal plane behind
rear
surface of cell. |
| - Big corrected flat field without
need for additional correctors |
| - 3" MONORAIL
Focuser with better stability |
- valuable asset for doing
wide-field astrophotos with your
Ritchey-Chretien scope. |
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The ASA 0.84X 4"
Ritchey-Chretien Reducer
Corrector will improve your
images from your
Ritchey-Chretien telescope,
by eliminating both coma
and
field curvature problems!
This corrector lens is
designed for use on R-C
telescopes having an
aperture of 0.4meter
(15.75") or larger,
and an
f/number of f/8 or slower |
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This Reducer Corrector
provides a 4" aperture and
it's optimized for
full-format CCD arrays up to
36.8mm x 36.8mm (Kodak
KAF-16803 CCD).
This
corrector is almost free of
vignetting, and can be used
with detector arrays
requiring somewhat larger
circular coverage, however
one would expect some minor
loss of performance. |
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This corrector lens is
optimized for a bandwidth of
400nm to >700nm, and every
lens used in the corrector
is measured to verify its
surface
radius & thickness,
before it is used in an
ASA corrector system.
Testing has shown that using
this corrector with your ASA
R-C telescope will
produce
stellar images which are as
tight and round, across the
useful field,
as any enhanced optical
telescope. The results are
pinpoint stars from
the side
all the way into the center
of the image. |
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The 4RCKORRR reducer lens
will reduce the inherent
focal length by a factor of
0.84X. This lens has a field
coverage of 60mm, which will
more than cover the entire
array of a
Kodak KAF-16803 CCD
detector. The back focus of
approx. 86.5mm is sufficient
to allow for using an
off-axis guider or filter
wheel with your detector
system.
Designed by ASA physicist
Philipp Keller. |
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The pertinent dimensions for
the 4" 0.84X
Ritchey-Chretien Reducer
Corrector by ASA are: |
| OD of lens cell
barrel: |
122mm (4.8") |
| Entrance aperture: |
4"; suitable for use on an f/8
system or slower. |
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Rrear flange: |
Not used in thes
design |
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OAL: |
approximately 75mm |
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FFD: |
approximately 86.5mm |
| FFD (Flange focal distance): |
Location of CCD plane
behind "flange," in this
case, the rear surface of
lens cell. |
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Ordercode: GSO400 |
Price on
request |
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