Just learned a little something about chronographers that I thought I'd share just in case I'm not the only one unaware of this. From the AT site:
A chrono can be off, but usually lighting is to blame.
The difference between 3200 fps and 3230fps might not seem like much when shooting your .300, but with a bow 30fps means the world!
I am not sure how they are calibrated, but lighting is usually at fault for bad readings. Shadows or light at the wrong angle can really mess with a chrono. We had an indoor range setup shooting bows and if somebody stood 3 feet to the left of the chrono when you shot, it would make your bow 40fps slower. Kinda funny...just a shadow or blocking a light source is all.
’11 Hoyt Carbon Element 65lb draw, Spot Hogg Hunter sight, QAD HDX drop-away rest, 8” Axion Gridlock 3D Hunter stabilizer, Archer Xtreme Carbon Vapor (camo dipped) quiver w/ riser-mounted Stealth Cam EPIC videocamera.