How fine toothed is the electronic aperture blade control in modern lenses?

Started Jan 12, 2014 | Discussions thread
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Theory or practice
In reply to ApertureAcolyte, Jan 12, 2014

In theory it is impossible to make a digital control system with a totally smooth analogue output. This includes setting aperture, either under manual control or by auto metering.

However, as no mechanical system is 100% perfect it seems reasonable to consider that a digital system that has granularity finer than the mechanical accuracy of the aperture blade adjustment may be described as 'smooth'.

This is another example of signal to noise effects.

Whether any camera system attempts to produce a totally smooth control I don't know. I would expect that dedicated video systems would aim to approximate a smooth variation, but even they may work with (say) 0.1 stop increments which would probably be undiscernible to a human observer.

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