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Thread: Chrony and light conditions

  1. #1
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    Default Chrony and light conditions

    Hi there.

    I was wondering how light intensity is affecting the chrony's reading.

    I was shooting with the pistol clubs chrony today and what I saw was very disturbing at first till one of the other members told me that the bad light does affect the readings.

    For example. Good light with nice sun: 750-770 ft/s
    Light clouds no sun: 720-740 ft/s
    Darker cloud: anything go even had a 50.7ft/s. had some around 400and 500 and them a lot did not register at all.

    Even had a few non regesters with a .357 magnum in dark cloud.

    How sensitive are chronys to light and what is the ideal light conditions for them to give a true reading.
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  2. #2
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    Useless in poor light
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  3. #3
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    So how do I know if the light is OK to take true readings? I got a nice string of 5 shots at 720-740ft/s before it went to 750-770ft/s for 10 shots, as the sun came out. That is a bug jump for cloudy to sunny.

    Should I rather only use it on sunny days for true readings?
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  4. #4
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    I must say my experience of chronies is not great. I have never seen two giving the same (or even similar) reading. And the one at the competition is always high
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  5. #5
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    Today I had oppurtunity to line up 3 Chronies in a row, nose to tail, and check values from each shot. The values were consistant, and by changing the order of the Chronies between shots, it was obvious all of them were with-in 0.2 m/s of each other.

    The velocity values dropped quicked than I expected, but the results were consistant with always the Chrony closest to the muzzle highest, and then falling off down range. Typical values: 239.7 / 238.8 / 238.0 (m/s)

    Conditions were medium overcast, 2 pm.
    Last edited by micx; 17-01-10 at 21:12.
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  6. #6
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    Quote Originally Posted by micx View Post
    Typical values: 239.7 / 238.8 / 238.0
    Metres/s?
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  7. #7
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    Err.....Yep (Post edited!)
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