A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
Macx Senior Member • Posts: 1,433
Re: A few words on Equivalence and comparing systems

texinwien wrote:

olliess wrote:

texinwien wrote:

Just another Canon shooter wrote:

texinwien wrote:

This is your mistake. You think a smaller equivalent f-number equals better performance. That is simply not the case, unless shallow DOF is your measure of performance.

More light is not?


"Didn't want that light anyway."

It's the sensor not the lens, and JACS is talking about measures of lens performance w/r/t equivalence.

But I'd wager you knew this and were just trying to be witty. Unfortunately, you just ended up sounding obtuse.


Keep the sensor out of it. The sensor size is interesting because the FOV of a particular lens is dependant on it, but for the same FOV and the same physical aperture the systems are equivalent and they get the same amount of light. If we had lenses with the same FOV and the same physical aperture for micro four-thirds as we have for 135, there would be no innate shot noise advantage of the larger sensor.

In other words, it's the lenses, not the sensor, and if we had a 12-35/2 our exposure envelope or gamut would be equal to having a 24-70/4 for our 135. The loss of a stop of total light when going from a 24-70/4 on a 135 to a 12-35/2.8 on M43 is dependant on the latter being f/2.8 and not f/2.

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