40" Dream Telescope & Facility


The optical designer that Dream chose to create the Prime Focus Corrector (PFC) on the 40" Dream PFTelescope has created such correctors for telescopes as large as 8m.

One of the largest correctors (the lens itself) that the optical designer has done is 1.36m in diameter.

The designer has created PFC's, Cassegrain correctors and reducers, plus he has done the current design of LSST. The latter is a 8.4m f1.25 (system f-ratio) telescope that employs three mirrors and a three lens corrector. He has designed correctors for 0.9m, 3.5m, 4.0m, 4.2m, etc..


The 40" Dream PFT will be the world's largest primary focus field, at 4.84 deg².

The current design for this corrector will use a 382mm clear aperture first element of silica. The illumination at the extreme corners of the 95mm x 95mm CCD chip will be greater than 93%.


The telescope structure's declination attachment point is facing down, near the lower/mid center of the structure.

The primary mirror covers (carbon fiber) are also shown in the rendering to the left, in the open position. The prime focus corrector resides inside a baffle. The telscope will be parked at a zero zenith angle, thus reducing dust buildup on the prime focus corrector.


The carbon fiber telescope, with all components shown to the right, will weigh less than 500 lbs. This is less than 1/4 a conventional telescope.

A conventional 1m/40" telescope's primary mirror alone can weigh 500-600 lbs.

 The use of a cellular primary mirror and carbon fiber skinned sandwich core structure and sub components allow this telescope to be lighter, stiffer and track ambient temperatures far better than other telescopes. The dome's design was also based around sound thermal features that help to produce the highest Delivered Image Quality (DIQ).

If the DIQ can be reduced from a FWHM of 1.25 to 0.85 arc seconds, exposure times can be cut in half to reach the same magnitude: 28 versus 14 minutes to reach mag 25 with a s/n=3 in r'.


The comparison to the left shows the 40" Dream above the 0.4m (16") Dream Astrograph for scale.
 
 
 
 

To learn more about The Madawaska Highlands Observatory, please visit their web site.
 
 

Be sure to view the CAD animation .


 

 
 


pricing, availability and specifications subject to change without notice