Thread: Which Chronograph?

The bad news is all optical chronographs are affected by varying light.
Using infra red back lighting can eliminate the issue but I found even with infra red lighting stray sun lighting can create issues. The infra red screens were also a pain to set up.

It shows up as differing velocities on different days at the range with the same loads and often out of wack velocities on the day when clouds clear or come over . Diffuser shields are supposed to prevent the issue but they don't always. It depends what angle the sun is in the sky. I always got reasonable results though on overcast days.

On some days moly coated bullets were hopeless to pick up. Also had 22rf bullets going at 4000 fps.

I started out with a very simple F1 Chrony (Chrony not on your list) which wasn't a bad unit, then went to a CED first model, then a CED M2. The CED M2 is rated by some as the best of the optical chronographs maybe even as good or better than the Oehler 3 Screen. The M2 when introduced had one of the fastest frequency clocks in it which aids accuracy.