Test out of another 16" f3.75 Dream Astrograph - Filter Air System Technology (FAST)

The focal plane evaluation shown to the right was created using CCD Inspector. It shows the symmetry and quality of the field of a 16" f3.75 Dream Astrograph that was tested in April of 2010 in Dream's observatory. The telescope was extensively tested over four nights. Shane Santi performs these tests personally for each and every telescope Dream produces, and has been for seven years. The CCD used is a KAI-11002 chip: 9 microns square, 4008 x 2672 (42mm diagonal).
Click on either of the CCDI graphics to download the raw FITS file.
Collimation of this and all of the Dream Astrograph telescopes was achieved by using the custom 3" Catseye collimation tools that Dream had developed specifically for these telescopes. Collimation of the telescope was done during the day. No collimation adjustments were needed to the telescope itself at night (CCD). We have found that the proper use of the collimation tools and the design features of the Dream Astrographs eliminates the need for non-intuitive collimation adjustment of the telescope optics (CCD).
Dream and our customers have also found through empirical test results that our state of the art telescopes not only hold focus across temperature changes but the telescopes hold collimation across the entire sky. This is a huge accomplishment for a system with a depth of field of only 30 microns, used on equatorial mounts (constantly changing, compound angles of the telescope) and with large CCD chips.

"Within a temperature range of 10 degrees C we see no measurable change in focus. Also, there was no change in focus as a function of telescope position. All thanks to rigid carbon fiber."
- Michael Schwartz, Tenagra Observatories, 16" f3.75 Dream Astrograph owner.  

"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."
- Mel Helm, Sierra Remote Observatories, 16" f3.75 Dream Astrograph owner. 

 Below is a 3D representation of the focal plane.

Click the image to the left to see a high resolution photo of the telescope.

Click on the M81/M82 thumbnail to the left to see images taken by a Dream customer with their Dream Astrograph.


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