There is no magical size/weight advantage

Started 8 months ago | Discussions thread
nigelht
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Re: What "exactly" is an equivalent lens as regards to the sensor size?
In reply to olyflyer, 8 months ago

olyflyer wrote:

That's exactly it. Not only to you, but to everybody else. Those lenses are not equivalent, only equivalent to the half... or one third if you are generous, ignoring other, sensor and IQ related issues, like same ISO = more noise if the sensor is smaller.

This is false and assumes that the sensel sensitivity is identical across large and small sensors.  There are 1" BSI sensors in production consumer cameras.  Are there FF BSI sensors in production consumer cameras?

The LENSES are indeed equivalent in terms of exposure or the ISO would be different.  The fact that noise changes at the same ISO is true if I stuck the same lens on a 1" Nikon camera vs 1" Sony camera.

LENS equivalence never has anything to noise performance of a sensor since what sensor it is paired with changes over time or between manufacturers.

Otherwise no lens is rarely ever even equivalent with itself whenever it is placed on a different body and that's just silly.

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