I agree with Joea. The chronograph is usefull only to the extent it helps you measure the distance travelled by the target in one , two or three minutes, etc, so you can do a time/distance calculation. If you have to keep the scope up the whole time it is of no practical value. You should only have to keep the scope up for a few seconds to plot the location of the target at the beginning and end of the time period you choose, one,two or three minutes, or whatever. Joe S
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