For *real* security applications, not just "I need a security camera for insurance purposes" FF sensors offer much better low-light performance of course. Recording 4K, or higher, surveillance footage may be the difference between (for example) seeing which of your warehouse staff is stealing products and just knowing that someone is doing it.From what I know, security cameras have small sensors, not even m43. With the low resolution those operate (often 1080p or even 720p) they still have large pixels. The dark aperture on the other hand isn't a preoblem for security cameras, you often focus to some distance and you want the maximum DOF...
This is 100% a vertical market product.
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