ISO 50?

Started May 15, 2013 | Questions thread
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ISO 50?
May 15, 2013

I'm out shooting the ocean waves and rocks and playing around with filters and stacking.  I start to lose the ability to auto focus and I notice some vignetting.  So I started to think why is ISO 50/100 the lowested.

My question for techies, is what makes it so hard to get a sensor to go lower than 50?  We found ways to impove high ISO and continue to go up and up.  Why is 50/100 still after 50 years the lowest why have availible to us?  Peace!

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