Please give me a simple explanation in this.

Started Feb 8, 2013 | Discussions thread
just Tony
Contributing MemberPosts: 560
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Re: Please give me a simple explanation in this.
In reply to scotbot, Feb 11, 2013

scotbot wrote:

I actually thought digital sensors were too reflective rather than not reflective enough.

In Nikon film SLRs (probably the other manufacturers as well) the flash metering is regulated during the exposure, based on measurement of light scattered off-axis by the film surface. Films are surprisingly reflective for something that is intended to absorb light, so there was plenty of signal. The diffuse scattering behavior was critical because the flash sensors have to be off-axis otherwise they would have cast a shadow on the film.

There is a small amount of reflection from a DSLR sensor stack but it's nearly all specular and goes back towards the lens where there is no light sensor.

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