This table gives the focal length and other key specifications for each telescope.
|Scope||Focal Length||Aperture Inches||Aperture MM||F||Weight Kg|
|GSO 8" RC||1,625||8||203.2||8||7.5 *|
|North Group ED127||950||5||127||7.5||9.97|
|WO Megrez 72FD||432||2.8||72||6||2.7|
* With 2" extension tube, OAG and guide camera attached
Previous scopes: Celestron Nexstar SE8
The following table details the sensor and pixel size for each camera.
|Camera||Chip||Type||Sensor Size mm||Resolution||Pixel Size µm|
|Nikon D50||Sony ICX413AQ||DX||23.70 x 15.60||3,008 x 2,000||7.8|
|QHY5||Micron MT9M001||1/2||6.66 x 5.32||1,280 x 1,024||5.2|
|Philips SPC900NC||Sony ICX098BQ||1/4||4.6 x 3.97||659 x 494||5.6|
|Canon 500D||APS-C||22.3 x 14.9||4752 x 3168||4.7|
|QHY9||KAF-8300||17.96 x 13.52||3326 x 2504||5.4|
|STL-11000M C2||KAI-11000M||36 x 24.7||4008 x2672||9|
Field of view in degrees and arc minutes. Some of the data in this table was measures by Astrometry and the remainder was calculated from the approximation formula (source: Digital SLR Astrophotography by Michael A. Covington, page 59)
FOV (degrees) = 57.3 * Sensor Size (mm) / focal length (mm)
|Philips SPC900NC Arc Min||Canon 500D
|STL-11000M Arc Min||
|GSO 8" RC||50.43 x 33.53||14.09||9.73||47.18||38.8 x 29.1||71 x 47*||10.37|
|AT12IN||102 x 68*|
|ED127||84.71 x 56.33||24.10||16.65||80.70||65.00||126 x 85*||17.73|
|Scope||Nikon D50||QHY5||Philips SPC900NC||Canon 500D||QHY9||STL-11000M||STL-11000M Guide Chip|
|GSO 8" RC||1.00||0.66||0.89||0.60||0.69||1.14||0.95|
This mount was purchased with astrophotography in mind. It is in fact a standard EQ6 that has had the stepper motors, board and hand controller upgraded. That's why it's black and not the standard white color.
The mount has 3 modifications since I purchased it.
The most significant one is to use EQMOD instead of the hand controller.
Secondly I have reduced the noise it was making while slewing.
The other modification was to add a Geoptik saddle plate to allow the imaging and guiding scopes to be mounted simultaneously.
I acquired this scope in September 2009. It's a very solid looking scope with beautiful CNC machines parts. I use this scope for imaging and guiding. The retractable dew shield does a great job keeping dew off the objective lens. As an imaging scope, I found that stars in the corners tended to be elongated, radiating out from the center of the image. This seems to have been fixed to a large degree by a Williams Optics 0.8 Reducer/Flattener II.