There is no need for 1/10s resolution, because it is not possible to achieve that resolution from a laptop.. At least not without a lot of work and testing.. Even then you cannot acquire that level of accuracy in actual use.. There is generally only one way to achieve accurate time, and that is via a 1PPS output from a GPS, such as provided by the now longer produced KIWI OSD.. Derek I created a little web-app that calibrates a digital camera's time delay and lets you know exactly when it is that your camera recorded the time. For my Nikon D70, if I do a 2 second exposure followed by a 2 second noise reduction dark frame step - the time is the end of the original exposure (and before the 2 second dark frame). This is different than Marco's camera which records the time at the start of the exposure. Unfortunately my camera only stores the time to a 1 second resolution - no tenths of seconds (or finer) so this whole feature is kind of useless for satellite timing. Better to trigger the camera with my laptop at a very accurate time. I already have software to do that. Here is the application- it's very simple - basically take a picture of the screen at the website below. Try it out even if you don't have a digital camera and you'll see how it basically works: http://gr5.org/calibrator.htm Feel free to steal it and post it on your own website. - George Roberts http://gr5.org ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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