SilverPeasant
Member
I’m just learning the AF100, returning to video/film after a long absence, and poring over Barry’s AF100 book.
One of the hardest things for me to wrap my head around is the whole CMOS, shutter speed, syncro scan concept. And I’m wondering if it’s related to this phenomena:
My sofa next to a window has a finely ribbed fabric. If I tilt while shooting, the ribs either brighten or darken quite dramatically. I’ve noticed similar effects with other reflections - the ground, plants, my cat, while shooting handheld. (This effect is especially vivid in the viewfinder with red Focus Assist - but not to the naked eye.)
For the sofa, I shot three clips - 1080/24p, at 1/24, 1/60, & 1/120 shutter speeds (w/manual iris and focus, Lumix 20mm lens). The higher the shutter speed, the less pronounced the highlighting of the fabric’s ribs while I tilt.
Questions:
1) what is this phenomena called and what are different approaches to handling it?
2) beyond dealing with strobing, syncing with lights or a monitor, or controlling blur with moving objects, what are the other ramifications (plusses, minuses) of changing shutter speeds? Is it preferred to go with the default shutter speed (SHUTTER OFF) unless circumstance calls for it?
One of the hardest things for me to wrap my head around is the whole CMOS, shutter speed, syncro scan concept. And I’m wondering if it’s related to this phenomena:
My sofa next to a window has a finely ribbed fabric. If I tilt while shooting, the ribs either brighten or darken quite dramatically. I’ve noticed similar effects with other reflections - the ground, plants, my cat, while shooting handheld. (This effect is especially vivid in the viewfinder with red Focus Assist - but not to the naked eye.)
For the sofa, I shot three clips - 1080/24p, at 1/24, 1/60, & 1/120 shutter speeds (w/manual iris and focus, Lumix 20mm lens). The higher the shutter speed, the less pronounced the highlighting of the fabric’s ribs while I tilt.
Questions:
1) what is this phenomena called and what are different approaches to handling it?
2) beyond dealing with strobing, syncing with lights or a monitor, or controlling blur with moving objects, what are the other ramifications (plusses, minuses) of changing shutter speeds? Is it preferred to go with the default shutter speed (SHUTTER OFF) unless circumstance calls for it?
