“Full Frame Equivalence” and Why It Doesn’t Matter

Started Feb 4, 2013 | Discussions thread
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Re: “Full Frame Equivalence” and Why It Doesn’t Matter
In reply to noirdesir, Feb 5, 2013

noirdesir wrote:

sean000 wrote:

If the thread is about m4/3 only, then leave other formats out of it unless there is a point to bringing up a comparison (and sometimes there is). But what I find frustrating is that we can't seem to have a thread discussing the differences between a two m4/3 lenses of different maximum apertures without someone saying, "Well the 25mm f/1.4 isn't really an f/1.4 you know." Yes, I'm afraid that is exactly what it is. That's a physical lens property. Same goes for using a legacy lens like a 50mm f/1.4. It's still a 50mm f/1.4, but it will just yield different results when used on different sensor sizes.

If the m43 users could only honour this advice and not describe a 25 mm f/1.4 lens as a 50 mm f/1.4 lens.

Fair enough. This is why, when I do need to make a comparison, I say "The 25mm f/1.4 produces a field of view equivalent to a 50mm lens on 135" or some shorter version of that. It will also produce the same shutter speed at f/1.4 as an f/1.4 on FF will at a given ISO and light level... but I figure that's obvious.

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