6D - Weird Image Line

Put me in the "fluorescent light cycling" crew.

That is a pretty dramatic example, but given that it has not happened since, and placement was erratic, it makes sense.

The museum might well have some special lighting that may help preserve the artifacts.

drveede76 wrote in post #17768570
Need some help from POTN.

I was at the the museum today with the family and in two specific display cases, this issue of a line in the image kept happening. it was not consistent and was random around the image. Is this a shutter issue? Or maybe a light cycle of the display case? It seems like it is in the camera since it remained in the same orientation of the camera. It only happened on these two parts of the museum. I was shooting aperture priority at f2.8.

Thank you,
Dave

drveede76 wrote in post #17769156
I do grip up in portrait orientation.

Not very likely to be the shutter. It is NOT in the same place for each orientation. In landscape it is at the bottom of the frame. In portrait (grip UP) it is at the top of the frame. Coincidence, probably fluorescent light flicker.

maverick75 wrote in post #17768791
You can't even physically mount EF-S lenses on a Canon full frame.

You can try, I did it by accident once and knocked the mirror off. $200 repair at Canon.

maverick75 wrote in post #17768791
You can't even physically mount EF-S lenses on a Canon full frame.

Not entirely true. Look for threads about 10-22 on 5D Mk III. You have to remove a baffle or something, but it does work. WHY do it? is another question entirely.

Thanks everyone, amazing amount of knowledge on this forum.

Dave

Were you using a flash of any kind?

No flash, they weren't allowed.

I'm wondering if the lighting is not museum quality LED. That might account for the rapid cutoff.

That's a lighting issue. Did you shoot anything at higher or lower shutter speeds, and if so, is the black band wider in the longer exposures and narrower in the shorter ones? With fluorescent lighting, there are usually alternating dark and light bands, that correspond to the mains frequency. But with dimmable LED lighting, anything is possibly, since they regulate via duty cycle, so when turned up to more than half brightness, the "off" dip in output is shorter in duration than the "on" time of the cycle.