Home · Register · Join Upload & Sell

  

  Previous versions of jeffbuzz's message #15897672 « Multiple Flash alternate firing for high frame rates? »

  

jeffbuzz
Offline
Upload & Sell: On
Re: Multiple Flash alternate firing for high frame rates?


As far as achieving your desired fps rate with fully synced lights (not alternating), that would depend largely on the capability of the camera and recycle rate of the strobe(s). I think all the Sony bodies have various caveats about diminishing frame rates when using flash and/or AF-C. You don't specify which camera. Although I assume a9 or a1 if expecting 20 fps.

If using a1, are you trying to use e-shutter too? That may create a new set of issues. Although a1 does flash sync the e-shutter, you would now need to consider the flash duration. The AD200 does show the duration so you can see how power output effects it.

My a9 II continuously triggers an AD200 via X2 trigger in mech shutter, 1/250th, Hi speed drive, AF-C, center tracking, flash mode M, 1/128 power. The AD200 shows a duration of 1/12190.

Whether you can achieve the power you need with the recycle time necessary to get close to the frame rate you want is totally a factor of power. More power = faster recycling. I'm getting ~f/2.8 @ ISO100 @ 2 meters.

These are the exif times I get from a short burst:

SubSecDateTimeOriginal : 2022:03:22 12:44:55.838-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:55.938-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.039-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.139-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.239-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.339-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.440-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.540-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.640-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.740-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.840-07:00
SubSecDateTimeOriginal : 2022:03:22 12:44:56.941-07:00

So I'm getting roughly 11fps at the above strobe settings. All images showed equal flash output.

I tried the same test using AF-S and also got ~11fps.



Mar 22, 2022 at 03:26 PM





  Previous versions of jeffbuzz's message #15897672 « Multiple Flash alternate firing for high frame rates? »