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Ritchey-Chrètien
Instruments |
Engineered athermal
instruments produced by Dream in Nazareth, PA |
The R-C Cassegrain has the widest diffraction-limited
field of any 2-mirror instruments, which is why it is THE choice
for performance-driven customers. |
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These revolutionary instruments come standard
with all of the following: |
Since 2003 Dream has produced instruments
with the highest amount of carbon
fiber & CF skinned Sandwich
Core (CFSC) of any company
in the world. |
***- 95%
of the structure weight
is carbon fiber with only 5% traditional
metals. Make sure the instrument
you're ******looking at from others is actually carbon fiber.
Ask pointed questions and look closely at photos. Buyer beware. |
***- These
athermal instruments use Dream's in-house carbon fiber extensively,
especially for the all-important mirror mounts. |
***- The highest stiffness,
lowest mass structures & instruments on the market, producing
cutting-edge all-sky performance.* |
***- While
other companies say "carbon fiber telescope," most
use only 5-10% CF and 90-95% high CTE, inexpensive aluminum. |
******True
performance doesn't require constant refocusing to compensate
for low stiffness & non-athermal losses. |
******Knowledge
is power. Ignorance a liability. |
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Custom 20" f7.5 shown in the f5.6 focal reducer
configuration.
Telescope tube 44" long.
Spider hub, vanes, inserts & hardware are stainless
steel. |
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* FAST: Dream's Filtered
Air System Technology. |
***- Equalizes
the mirrors and interior air volume, while also keeping optical
surfaces clean for extended periods of time. |
***- Maintains
higher reflectivity longer, requiring fewer cleanings & extending
the useful life of coatings. |
* Dream's low-profile, precision actuator-driven motorized M2:
1.5µm/step raw oerformance (before microstepping). |
***- Wide
footprint precision bearings & actuator's low-profile produce
a shorter, stiffer assembly & telescope length. |
***- Actuator
stalls at 95 pounds of force, for extreme stiffness. M2 on the
40" f8 Dream R-C weighs less than 7 pounds. |
***- Old, inexpensive designs from
50 years ago that use a central, small diameter shaft, lack enough
stiffness. |
***- M2's have been finished to
as high as L/125
RMS surface, with 2Å RMS surface roughness. |
* Intelligent modern designs, implementation
and technologies that provide truly cutting-edge
total performance. |
* Policies & Warranty. |
The three sizes shown below
with a dark red background are the most common sizes and represent
the shorter lead times. |
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clear aperture |
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optical |
illuminated |
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size |
f-ratio |
back focus |
field |
M2 CA |
length |
weight |
cost |
model |
12" |
8 |
200mm |
60mm |
103.6mm |
27.8" |
25 lbs |
$26,750 |
DRC12-8 |
14.5" |
8 |
235mm |
60mm |
119.1mm |
32.5" |
33 lbs |
$35,125 |
DRC14-8 |
16" |
8 |
265mm |
60mm |
134.0mm |
37.1" |
40 lbs |
$47,875 |
DRC16-8 |
20" |
8 |
325mm |
60mm |
164.0mm |
46.2" |
55 lbs |
$69,250 |
DRC20-8 |
25" |
8 |
400mm |
60mm |
195.3mm |
55.7" |
105 lbs |
$109,950 |
DRC25-8 |
32" |
8 |
535mm |
60mm |
256.5mm |
74.3" |
195 lbs |
$198,500 |
DRC32-8 |
40" |
8 |
650mm |
60mm |
315.9mm |
92.3" |
352 lbs |
$337,995 |
DRC40-8 |
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If the above ~50mm field Ø
is too large or small, Dream can modify an existing design, including
corrective optics. |
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True Performance
Doesn't Fear Change. It Defies The Status Quo. |
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Survey/Search Instruments |
32" f4.2 Dream R-C:
61.5' x 61.5' (1.05 deg²) |
Fast, compact & highly corrected
Ritchey-Chretien instrument: survey, NEO, etc. Click here to learn more about this wide-field, high throughput
science instrument, camera and mount combination. |
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1m f5.4 Dream R-C:
60.1' x 60.1' (1.003 deg²) |
Fast, compact & highly corrected
Ritchey-Chretien instrument: survey, NEO, etc. Click here to learn more about this wide-field, high throughput
science instrument, camera and mount combination. |
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1m f3.375 Dream R-C:
61.3' x 61.3' (1.04 deg²) |
Faster & even more compact
than above design - Ritchey-Chretien instrument: survey, NEO,
etc. Contact Dream to learn more about this and many other options. |
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Dream uses
Modern Optical Metrology |
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Custom Cassegrain Instruments |
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24" f12 Dream
R-C: |
free-space optical communications
/ lasercom: NASA |
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16" f2 Dream
Cassegrain: IRetelescope with 6-lens IR relay, 2 each - Ge,
ZnS & ZnSe, dual-band performance: USAF |
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25" Cassegrain
Telescope: Structures for solid
ULE M1 & M2: Turkey |
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Dream can produce
carbon fiber structures for zero-expansion optical sets, as well
as full telescopes ranging from f1.35 to f20+, from UV to LWIR.
The above instruments are often jumping off points. Contact
Dream to discuss your project's requirements. |
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pricing, availability and
specifications subject to change without notice |
Copyright
© 2003 - 2021 Dream All Rights Reserved. |
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