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Ritchey-Chrètien full Optical Tube Assemblies (OTA)

The R-C Cassegrain has the widest diffraction-limited field of any 2-mirror-only optical design.

Highly engineered, athermal instruments designed & made inside Dream: Nazareth, PA - USA


Cutting-edge optical instruments with world-leading installed performance.

Dream uses

Modern Optical Metrology
 
 
 

 
 

 

 
 
 

Believe the atmosphere is your performance limit?

Click Above
 
 
 
 
 

Since 2003 Dream has produced optical instruments with truly the highest amount of carbon fiber & CF skinned Sandwich Core (CFSC) of any company in the world. Dream designs & fabricates all of the carbon fiber in house & has been doing composites for the past 20 years. Others use aluminum and solid mirrors extensively, which shows in the mass of their products. Dream's technologies produce instruments that are often 1/2 to 1/3rd the mass of others who claim to be "lightweight," because Dream uses carbon fiber honestly & to such a high level. Dream's CFSC has been developed over the past 20 years and is an ideal technology for opto-mechanical systems; high modulus, low structure & thermal mass, with a Coefficient of Thermal Expansion that matches Dream's highly engineered lightweight mirrors.
***- 95% of the structure weight (without optics) is carbon fiber with only 5% traditional metals (mostly stainless steel).

Make sure the instrument you're considering uses carbon fiber extensively. Ask pointed, specific questions, especially for the mirror mounts, and look closely at photos. There's no truth in advertising, which is one of the main reasons Dream was formed in 2003 and has taken over so many aspects of the products since then. Anodized aluminum isn't remotely close to the same in mechanical or thermal properties as Dream's CFSC... Buyer beware.

***- The highest stiffness, lowest mass structures & instruments in the world, producing cutting-edge all-sky performance.*
***- While other companies say "carbon fiber telescope," most use only 5-10% CF by weight & 90-95% high CTE aluminum.
******True performance doesn't require constant refocusing to compensate for low stiffness & non-athermal losses.
 

Knowledge is power. Ignorance a liability.
 

Custom Dream true R-C 20" f7.5 shown in the f5.6 focal reducer configuration.

Telescope tube 44" long.

Spider hub, vanes, inserts & hardware are stainless steel.

* Both front surface optical mirrors are Dream's zeroDELTAengineered lightweight mirrors.
***- Mirror seeing and tube currents are eliminated due to Dream's thin-featured highly engineered lightweight mirrors.
***- Dream's zeroDELTA mirrors equalize hundreds of times faster due to extremely short thermal time constant & FAST.
***- 3-6 times lower mirror mass than solid mirror technology, producing far less flexure of mirror mounts and structures.
***- Much higher mechanical stiffness than overly thin, extreme conical mirrors that can't hold their optical surfaces.
***- M2's have been finished to as high as L/125 RMS surface (4.5x better than the diffraction-limit), with 2Å (0.2nm) RMS surface
******roughness & will maintain that extreme performance over at least a +/-3°C temperature swing, which equals the stability
******of the finest grade (lowest CTE) Zerodur.
* 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.
* Intelligent modern designs, implementation and technologies that provide truly cutting-edge total installed performance.
* Policies & Warranty. Officina Stellare Space Factory, Officina Stellare space telescope, Officina Stellare collimating telescope, autocollimation flat, autocollimating telescope

The three sizes shown below with a red background are the most common sizes and represent shorter lead times. More than 90% of what Dream produces is custom.
multi-spectral optical payload, space optical systems, earth observant space optical systems, earth observant space telescope, lightweight space telescopes, Ritchey-Chretien space telescope

clear aperture

optical

illuminated

size

f-ratio

back focus

field

M2 CA

length

weight

model

12"

8

200mm

55mm

103.6mm

27.8"

25 lbs

DRC12-8

14.5"

8

235mm

55mm

119.1mm

32.5"

36 lbs

DRC14-8

16"

8

265mm

55mm

134.0mm

37.1"

41 lbs

DRC16-8

20"

8

325mm

55mm

164.0mm

46.2"

69 lbs

DRC20-8

20"

5.6

275mm

55mm

178.6mm

42.0"

65 lbs

mRC™20-5.6

25"

8

400mm

55mm

195.3mm

55.7"

125 lbs

DRC25-8

32"

8

535mm

55mm

256.5mm

74.3"

215 lbs

DRC32-8

40"

8

650mm

55mm

315.9mm

92.3"

352 lbs

DRC40-8
               

If the above 55mm field Ø is too large or small, Dream can modify an existing design, including corrective optics.

Visit this page to learn more about the amazing 2-mirror, single lens 20" f5.6 that is the epitome of efficiency & performance.
SPIE telescopes & astronomical equipment, SPIE photonics west san diego, NASA telescope, NASA space telescopes, USAF telescopes, USSF space domain awareness ATLAS US Space Command

 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

opto-mechanical systems, remote sensing, Earth observation satellites, National Aeronautics and Space Administration NASA, Raytheon Technologies, Northrop Grumman, Lockheed Martin, Ball Aerospace, lasercom, freespace optical communication

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.

high performance optical telescopes, lightweight precision optical mirrors, lightweight front surface optical mirrors, lightweight telescope mirrors, lightweight opto-mechanical systems, carbon fiber telescopes, carbon fiber lightweight telescopes

pricing, availability and specifications subject to change without notice

Copyright © 2003 - 2022 Dream All Rights Reserved.

space domain awareness (SDA), space Situational Awareness (SSA), Ball Aerospace, Lockheed martin, Boeing space, planewave instruments, NASA JPL, NASA goddard, lightweight telescope, lightweight precision optics, lightweight precision mirrors

ABOUT

TECHNOLOGIES

PRODUCTS

WHITE PAPERS

TESTIMONIALS
Iceye satellite, NorthStar Earth & Space, AlbaOrbital, Planet satellite, Capella Space company, KLEOS space company, satellogic space company, PlanetiQ weather, SatSure satellite, SatRevolution company, Aurora Insight space company, Earth Observant Inc., USAF WERX, Skyeon san diego California, Albedo austin texas, discoverer horizon 2020 EU program, Airbus Defence & Space, BlackSky satellite, ASA telescopes, Officina Stellare italy, Planewave michigan USA, APM telescopes germany, DFM Colorado USA, L3Harris precision optics