These are the results of tests performed with a Canon EOS 70D DSLR at the end of a NexStar 102SLT. The camera has a 20 megapixel chip (5472x3648) with 4.1 micron pixels. I used exposures of 5s at 12800 ISO and used 4x4 binning in post processing. The telescope has a focal length of 660 mm at F/6.5, giving a pixel scale of 5.2 arcseconds per pixel and a 118x79 arcminute field of view. The telescope is mounted on an old equatorial mount, though it does not track on the stars. The camera is connected to a laptop using a USB cable and the NTP clock of the laptop is used to log the UTC timestamps of the start of the exposure. The data was analyzed using software that I'm developing to calibrate the astrometry of the images. 27877 03 040C 4171 E 20130928203251527 27 25 2139276-164785 17 S 27877 03 040C 4171 E 20130928203318484 27 25 2139738-164774 17 S 27877 03 040C 4171 E 20130928203332481 27 25 2139975-164772 17 S 27877 03 040C 4171 E 20130928203345527 27 25 2140214-164771 17 S 27877 03 040C 4171 E 20130928203400474 27 25 2140444-164766 17 S 27877 03 040C 4171 E 20130928203414471 27 25 2140685-164763 17 S 27877 03 040C 4171 E 20130928203427518 27 25 2140912-164759 17 S 33490 09 001A 4171 E 20130928212657489 27 25 0107159-075244 17 S 33490 09 001A 4171 E 20130928212709498 27 25 0107346-075227 17 S 33490 09 001A 4171 E 20130928212722458 27 25 0107571-075208 17 S 33490 09 001A 4171 E 20130928212734468 27 25 0107772-075184 17 S 33490 09 001A 4171 E 20130928212746478 27 25 0107959-075163 17 S 33490 09 001A 4171 E 20130928212746478 27 25 0107972-075163 17 S 33490 09 001A 4171 E 20130928212758487 27 25 0108171-075143 17 S 33490 09 001A 4171 E 20130928212810497 27 25 0108371-075131 17 S 33490 09 001A 4171 E 20130928212830542 27 25 0108705-075099 17 S 33490 09 001A 4171 E 20130928212842465 27 25 0108900-075072 17 S 33490 09 001A 4171 E 20130928212854474 27 25 0109102-075058 17 S 33490 09 001A 4171 E 20130928212906484 27 25 0109299-075036 17 S 33490 09 001A 4171 E 20130928212918494 27 25 0109509-075019 17 S 33491 09 001B 4171 E 20130928202011466 27 25 2144509-104097 17 S 33491 09 001B 4171 E 20130928202026500 27 25 2144738-104092 17 S 33491 09 001B 4171 E 20130928202040497 27 25 2144970-104076 17 S 33491 09 001B 4171 E 20130928202054494 27 25 2145203-104065 17 S 33491 09 001B 4171 E 20130928202108490 27 25 2145433-104050 17 S 35815 09 047A 4171 E 20130928213118503 27 25 0127564-072380 17 S 35815 09 047A 4171 E 20130928213130513 27 25 0127773-072374 17 S 35815 09 047A 4171 E 20130928213142522 27 25 0127966-072372 17 S 35815 09 047A 4171 E 20130928213154532 27 25 0128175-072373 17 S 35815 09 047A 4171 E 20130928213206542 27 25 0128372-072376 17 S ------------------------------------------------- Setup: Canon EOS 70D, NexStar 102SLT, NTP IOD format: http://www.satobs.org/position/IODformat.html COSPAR 4171: 52.8344N, 6.3785E, 10m (WGS84) ------------------------------------------------------------------ Regards, Cees _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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