Why can't digital sensors allow .1 ISO?

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hotdog321
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Why can't digital sensors allow .1 ISO?
5 months ago

I'm a photojournalist and shoot with two 5D III cameras. I love the heck out of the low light sensitivity of modern DSLR cameras. But why can't sensors allow landscape photographers to eliminate the 9-10 stop filter when desired?

The lowest speed my old 5DII cameras or new 5DIII cameras can handle is ISO 50--why not ISO .1 for flowing water, moving clouds, etc.? I'm sure there is some good reason.

Canon EOS 5D Canon EOS 5D Mark II Canon EOS 5D Mark III
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