I know the best readings come on a cloudy day, but what differences are you all getting between chrono on a sunny day with sky screens and a cloudy day? I haven't done a test of this, but I have nore than a slight suspicion that the reads will be different.

I can use my crony on sunny days around noon when the sun is high and with the sky screens but early in the day or later in the afternoon I get error readings, I think its more frome shadows than the suns rays. Around here we have plenty of cloudy days so so I pretty much only use the crony on them.

Jamie

I get error reads also, but I wonder if the velocities that are indeed given will be the same for both types of light conditions.

Load 100 or so rounds. Chrono half on a sunny day, the other half on a cloudy day. I've found more difference from ambient temperature difference than from light conditions, so note your temperatures and try and keep 'em within 50 degrees F. In the intermoutain west that's the a.m. to p.m. temp change. We tie the light diffusers/parasails to the chronograph so the unit lands more genlty if there's a breeze. Has anyone ever chronographed a flying chronograph?

Temperature is watched very closely during my strings.

Fur,
Here in Arizona the only problem I have experienced is if all three screens are not in the same condition I will get errors. By that I mean that if one or two screens are shaded or one or two are in the sun, I get errors. If all three have the same condition it matters not if they are sunny or shaded. I use an Oehler 35P. Jim