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What camera?
I'm wondering if it's the opposite - if those two photos are using the same settings (forgot to adjust aperture or speed) then what's good for the closeup would be very overexposed for the beach scene. The scanning might be trying to pull information out of the overexposed neg so you get that dullness.
If the neg looks very dark when you hold it up to the light, it's overexposed.If you're getting very underexposed shots mixed in with good exposures - it might be when you change direction, and sunlight hits the camera's lightmeter, confusing it. Look at where the meter is on your camera, is it possible for sunlight to hit it directly, even though the sun isn't in the frame?
Not sure. Is there an obvious way of testing?
two photos taken within minutes of each other, on the same film, in the same location.
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