On 28 Feb 2003, at 15:15, Greg Roberts wrote: > > >Date: Thu, 27 Feb 2003 00:33:44 +0100 > >From: R.Kracht@t-online.de (Rainer Kracht) > >To: SeeSat-L@satobs.org > >Subject: Milstar 5 > > >observations with my new video camera (Mintron 12V1C-EX) > >f=75 mm, f/1.3 > > Hi Rainer, > > Very pleased to see that someone else has now started to make use > of a sensitive video camera for satellite tracking - the Mintron > is a nice unit but a little too expensive for me unfortunately. > > Did you use the camera in the integrating mode in order to reach > magnitude 10.7? - I would not have thought it capable of going > that faint in video mode as there is no way I could reach that > faint. Im using a 1004x camera f=82mm, f/1.6 and this can reach > about +9.4 in good conditions with my bright city lit sky. > > Willie Koorts tried his new 1004x ccd camera on a 9 inch reflector > and was able to reach about magnitude +12 in video mode - ie about > 1/50th second exposure. > > Hope to see more people making using of video cameras as this is > the way to go ! > > Good luck > Greg > My city lit sky is also quite bright, I think the naked eye limiting magnitude was about mag 3 for the Milstar videos. The exposure time was set to 20 ms and the integration to 64x giving a total exposure time of 1.28 seconds per frame (0.78125 fps). The camera was fixed (no guiding). The pixel size of the Mintron (Sony) CCD is 0.008 x 0.008 mmm. With the 75 mm lens this corresponds to 22 arcseconds (1.47 seconds of time at the celestial equator). The field of view is a comfortable 4.9 x 3.7 degrees. This is a small, easy to use and powerful device. Rainer Rainer Kracht Elmshorn, Germany Station 5005 53.7695N 9.6626E 9m Potsdam Datum 53.7679N 9.6614E 47m WGS84 R.Kracht@t-online.de ----------------------------------------------------------------- To unsubscribe from SeeSat-L, send a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@satobs.org List archived at http://www.satobs.org/seesat/seesatindex.html
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