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"I went to bed at about 10PM and I let it run all night without focusing. I blinked through the images and focus did not change. Also, I did all of my other images by letting it run through the night without focusing."

- Dream Astrograph customer 


20" f3.5 Dream Astrograph - corrected Newtonian

Faster f-ratio Dream Hypergraphs are listed near the bottom half of page.

The only athermal instruments in the world that use such a high percentage of carbon fiber (95% of the weight of the telescope structures without optics) and mates those low-mass, high stiffness athermal structures with highly engineered, lightweight zeroDELTA mirrors. The entire system is optimized from the ground up for cutting edge installed performance, eliminating countless areas of performance loss. These are truly modern instruments with unrivaled consistent long-term installed performance and the lowest possible maintenance.


spectrograph, optical instrument, electro-optics, photonics, instrument designer

Optimized for IMX461: 101 megapixels

11656 x 8742 with 3.76µm pixels

Field Of View: 63.2' x 84.3' (1.48 deg²)

0.44 arc-sec/pixel

20" f3.5 Dream Astrograph shown

OTA diameter - OD

length

 focal length

24"

68.0"

1780mm - f3.5

secondary 

weight - pounds

single unit pricing

7.25"

86

$54,950

100% illumination of 55mm image circle - will work with IMX455 & IMX461 detectors

Note image of mounted telescope - only 3, 20# counterweights are required
 
     
 

Performance Starts At The Substrate

The zeroDELTA engineered primary mirror is 20.5" physical OD, over 3" tall, yet weighs only 20.0 pounds. Delivering unrivaled performance & SWaP-C.
 


The latest CMOS detectors have much, much smaller pixels (3.76µm versus the typical 9µm pixels of the previous generation of detectors). Dream and our existing customers don't need to upgrade anything. Our optical instruments have always achieved higher performance and we've always designed closer to the diffraction limit. In 2020 alone we designed more than a half a dozen optical systems ranging from 16" to 25", with f-ratios from f2.95 to as fast as f1.35 and for sensors from as small as 24mm x 36mm to as large as 95mm x 95mm.

Roughly 90% of what Dream designs & produces is custom. Contact us to determine whether your project can use an existing design, a slightly modified existing design or requires something completely custom. We've been designing fast optical systems since 2003. Our lead optical engineer has four decades of experience with fast systems.

 

Buy The Best. Only Cry Once.


"Achieving superb performance is a goal, but achieving that same high level of performance as the instrument changes angle and as temperature changes, is the signature of a Dream optical system." lightShane Santi - Dream Founder & President
 
 
Download raw, full-frame FITS files from this folder to see the world-leading performance from a 20" f3.5 Dream Astrograph.
Absolutely no processing was done to any of the raw files. Most test images are 5 seconds, to show the performance of the system, as opposed to allowing numerous errors to form a round, but bloated star. Real-world performance should be judged from uncropped, unaltered raw images. Ask manufacturers for raw, full-frame files that use short exposures. Otherwise the shape of the stars can be misleading because long exposures can average/randomize to hide numerous issues. Don't settle for cropped images that are used to show a sweet spot or processed images. If the optical system has dealt with all of the traditional issues and truly has world-class performance, it shouldn't need to hide behind anything. Higher installed performance means both higher resolution & achieving a deeper magnitude faster.
Athermal by design - Focus was not touched for any of the test images, which spanned two different nights; October 30th, 2018 and November 3rd, 2018. Dream tested this telescope over more than a 20°F temperature change and still couldn't detect degradation to the on or off-axis quality. This athermal performance, combined with the high stiffness of not just the materials but the designs that Dream uses, provides unprecedented stability & consistency. Dream has an extremely fast thermal time constant because it has fully dealt with both mirror seeing and instrument seeing. The optimization of so many parameters delivers the lowest possible maintenance & highest throughput.
 
Optical alignment of this and all Dream Astrograph telescopes is achieved during the day by using the dedicated alignment tools shipped with the optical instruments.
 


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

 

Both the lightweight primary & secondary mirrors are coated with First Contact prior to shipping. This protects the precision optics during shipment & provides pristine optical surfaces for Dream's customers.

 
Dream is the world leader in installed high-performance opto-mechanical systems because we have dealt directly with the traditional performance losses associated with; stiffness in structures and the thermal issues within and around mirrors. From day one Dream has focused on its engineered, high-consistency CFSC & CF structures that offer far higher stiffness and are used extensively in the instrument, not just one or two components. Dream has also pushed the zeroDELTA lightweight mirrors to unrivaled performance levels. Both of these technologies are designed & produced in-house, giving Dream unusual control, optimization and performance gains from this closed-loop approach.
 
Dream has unmatched full instrument stiffness with no focus shift due to sky location & no settling affect either. Dream's customers can slew to & immediately image. Because of the high stiffness and athermal nature of Dream's dedicated carbon fiber structures & the zeroDELTA lightweight mirrors, these opto-mechanical systems are at the cutting edge of both mechanical and thermal performance. Dream's customers are at the point of the needle in a haystack. For this reason Dream will never be mass-market.
 
If an optical system shows focus shifts at different instrument angles, it's a red flag that mechanical bending of the structure(s) is occurring. Adjusted focus images are not a true indication of performance, because it adds yet another area for performance loss. Mechanical bending often means off-axis performance has been lowered because the optics are not being held in a tight tolerance for alignment. Actual high-performance means keeping the optics aligned & focused to today's modern and very tight tolerances, not tolerances from 50 to 100 years ago.
 
What the instrument does on a horizontal test bench tells you nothing about that instrument's installed (dynamic) performance. Ask a manufacturer for raw images where focus and collimation were not touched at all during a full night of testing, assuming the instrument was tested in a real environment at all. Dream's optical instruments set a new standard, through our disruptive, complimentary & enabling technologies.
 

Unbiased Evaluation Of Performance; Mechanical & Thermal

All exposures are 5 seconds, unless otherwise noted. All exposures were taken through the luminance filter. 
 
Night of October 30th, 2018 -
3333 & 3334: ~30° zenith-angle, pointing west
3337: ~30° zenith-angle, pointing north
3337: ~30° zenith-angle, pointing north
3338: 45-50° zenith-angle, pointing north
3347 & 3348: zenith
3350 & 3351: 30-35° zenith-angle, pointing south
3352: ~55° zenith-angle, pointing WSW
3357 & 3358: ~50° zenith-angle, pointing WNW
3367: M31 near zenith
3368: M31 near zenith (30 second exposure)
Night of November 3rd, 2018 -
3373: near zenith
3374: near zenith (30s exposure)
3409 & 3412: M33 near zenith (30s exposures), ~2.25 hours after 3373 & 3374 images above

The CCD used during testing: KAI-11002, 9µm pixels, 4008 x 2672 (full-format, 42mm diagonal).
 

Dream provides pristine optics.
 
 
 
 

Shipped November 27th, 2018, to start a 5-year NASA program of NEO search & recovery.
 

One of Dream's 16" f3.75 instruments was one of a seven group previous NASA NEO search & recovery project. At least one other group member was using a 1m telescope, showing the extreme power, throughput & reliability of Dream's philosophy of fully dealing with the traditional issues of low stiffness and mirror seeing.

 
 
 
 
 


 20" f2.4 Dream Hypergraph

OTA diameter - OD

length

focal length

24"

42.5"

1225mm - f2.4
space domain awareness satellite debris tracking

510mm CA
space domain awareness space situational awareness NASA NEO search & recovery

secondary

weight - pounds

single unit pricing

10"

<88

$112,500

IMX411 151Mp CMOS detector: 3.76µm pixels, 14192 x 10640, 66.7mm image circle.
Field Of View: 112.2' x 149.4' (4.65 deg²)
Arc-seconds/pixel: 0.63
These dedicated optical systems are optimized for 100% illumination of the given detector. The Dream Hypergraphs come with 90mm of back focus. 

20" f2.4 Dream Hypergraph

OTA diameter - OD

length

focal length

24"

42.5"

1225mm - f2.4
space domain awareness satellite debris tracking

510mm CA
space domain awareness space situational awareness NASA NEO search & recovery

secondary

weight - pounds

single unit pricing

9.8"

<84

$97,750

IMX461 101Mp CMOS detector: 3.76µm pixels, 11656 x 8742, 55mm image circle.
Field Of View: 92.4' x 123.0' (3.16 deg²)
Arc-seconds/pixel: 0.63
These dedicated optical systems are optimized for 100% illumination of the given detector. The Dream Hypergraphs come with 90mm of back focus. 

Contact Dream about your project

Dream Astrographs & Hypergraphs

16"

25"

32"

R-C Cassegrains

pricing, availability and specifications subject to change without notice

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ABOUT

TECHNOLOGIES

PRODUCTS

WHITE PAPERS

TESTIMONIALS