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I agree with the others that measuring a variable star would be a good start. Because you don't have photometry filters this makes it difficult to measure actual magnitudes. A good choice would be an eclipsing variable as relative magnitudes are fine. There are plenty of bright enough ones that multiple time series of a few hours worth of 10sec exposures with the SLR would give a satisfactory light curve. From this data using Keplers 3rd law lots of parameters of the target stars can be measured.
Cheers
Terry
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