Morning Derek Glad you have seen the light :-)). I was beginning to get a bit frustrated :-)). Its actually quite simple - the time you want is the time the image first changes "state", and of course make sure you measure the end of the trail thats in the direction of motion since the image is "dumped" at the end of the exposure. If you measure the other end it will be earlier by the duration of your integration - Ive made this mistake from time to time and even quite recently! You have got the measuring part 100% so that is not a problem. Good luck Greg ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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