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| p.1 #6 · “Full Frame Equivalence” and Why It Doesn’t Matter |
When DSLRs were first being introduced, expensive and in crop-frame formats, "equivalence" comparison to the 24x36mm format was a useful concept --- every photographer would be intimately familiar with the ubiquitous "full frame" format, from disposable point-and-shoots to high end SLRs. These days, far fewer people "learning the ropes" with a first DSLR have much (if any) familiarity with the 24x36mm format; coming from cellphone and P&S cameras, it only adds confusion to expect people to first imagine an unfamiliar, mythical 24x36mm frame before "cropping" to common sensor formats.
I think the least confusing way to refer to lenses today would be by angular field of view (for their "native" mount) and entrance pupil diameter (instead of focal length and f-stop). A lens with equivalent numbers for these will "behave" the same regardless of format --- same image framing, depth of field, background blur, and noise limits in final image.