JCullman

Hi All

I have a Fuji XT4 and a Lightning Trigger (also the brand name).

I was photographing a storm at 1/4 second/F 5.6 on electronic shutter

The trigger works flawlessly in detecting lightning. Some, but not all of the photos, are exposed brighter in the top third than the bottom 2/3. The boundary is quite clear and absolutely linear in the horizontal plane.

Any ideas. Don’t know if there is some sort of rolling shutter effect due to electronic shutter.

Thanks - great forum

zug55 Loc: Naivasha, Kenya, and Austin, Texas

Electronic shutters have slightly lower readout speed than mechanical shutters. If the light of the lightning disappears just at the right moment during the readout, the top of the image may be exposed differently from the bottom of the image. Using the mechanical shutter should solve that problem.

The slower readout of electronic shutters also can lead to distortions if you take an image of an object in motion. Balls in in motion for instance can have the shape of an egg. I have had that issue with my Sony A7III before. I love using electronic shutters, but there are some limitations.

JCullman

Thanks. I knew of rolling shutter issues with motion but didn’t translate to turning out the light in the middle of the exposure. Makes sense.

Bill29707 Loc: Greenville, NC

I also use a trigger and sometimes, but usually not, have the same issue. Could the lightning be lighting up the clouds but lower there are no clouds so it is not as bright?
Bill