I can help. I grew up in the old days when cameras had manual metering and I had to do things manually.
Your camera tries to figure out the best exposure settings, which is a combination of the aperture and the shutter speed or exposure time (technically, on a digital camera, this is the integration time). There are all types of metering schemes - one can be based on the average of the entire frame, one can sample some discrete points around the frame, and another will base the exposure on a smaller, center area.
The camera sees the bright blue background, and sets the exposure accordingly. However, the sky has a lot of light, so the camera will choose a small aperture and a short integration time to get the blue sky right. But what you're interested in is the helo in the foreground, so you have to set the exposure based on that, which isn't as bright. Your problem is made worse by having it lit from behind, with no sunlight falling on the surface you're photographing.
I'm old school and not familiar with the latest digital cameras, but even in the old days, you could set your metering based on a smaller center area, so I'm sure the modern digital cameras will do that, and that's what you need to do. Set the metering to that, and make sure the metering area is what you want properly exposed. The background will then be overexposed and washed out, but if it's really important to you, you can adjust that with photoshop. Back in the old days, I'd have to do that by burning and dodging in a darkroom.
« Last Edit: May 26, 2019, 05:43:48 PM by trailrunner »
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