17P/Holmes 2007-Nov-20 Jim Melka

The field of view is estimated to be 0.75 by 0.50 degrees. The axis of the comet is pointed away from Earth and can be seen as a light shaft starting at the false nucleus lower left center and extending to the one-o’clock position. Magnitude 1.8 Mirfak is the bright star lower right. Sixty 30-sec frames were taken using a Canon 20d with a 50mm lens mounted afocally on 12" Newt. A 52mm 50-degree Antares erfle eyepiece was put in the paracorr lens mount. Calibrated frames with dark frame and flat frame using Images Plus 2.80. Used IP to measure and obtain the best focus and used digital development on the digitally combined Image frame. The frames were recorded with the Canon counter, timer, controller. Good seeing. Jim Melka