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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.


 

Dream uses

Modern Optical Metrology
 
 
 

 
 

 

 
 
 

Believe the atmosphere is your performance limit? Click above.
 
 
 
 
 
 

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.™
 
 

 

Custom 20" f7.5 shown in the f5.6 focal reducer configuration.

Telescope tube 44" long.

Spider hub, vanes, inserts & hardware are stainless steel.
* Both M1 & M2 are Dream's zeroDELTAengineered lightweight mirrors.
***- Mirror seeing and tube currents are eliminated due to the mirrors' extremely short thermal time constant & FAST.
***- 3-6 times lower mirror mass than traditional technology, producing far less flexure of mirror mounts and structures.
* 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.
 

clear aperture

optical

illuminated

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
                 

If the above ~50mm field Ø is too large or small, Dream can modify an existing design, including corrective optics.
 

 True Performance Doesn't Fear Change. It Defies The Status Quo.


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.

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.

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.

Dream uses Modern Optical Metrology

Custom Cassegrain Instruments

24" f12 Dream R-C:

free-space optical communications / lasercom: NASA
 

   
   

16" f2 Dream Cassegrain: IRetelescope with 6-lens IR relay, 2 each - Ge, ZnS & ZnSe, dual-band performance: USAF

   
   

25" Cassegrain Telescope: Structures for solid ULE M1 & M2: Turkey

 

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.

 

pricing, availability and specifications subject to change without notice

Copyright © 2003 - 2021 Dream All Rights Reserved.

 

ABOUT

TECHNOLOGIES

PRODUCTS

WHITE PAPERS

TESTIMONIALS