A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
Bob Tullis
Bob Tullis Forum Pro • Posts: 33,119
Re: A few words on Equivalence and comparing systems

richarddd wrote:

Sean Nelson wrote:

Macx wrote:

Two systems using lenses that each provide the same angle of view and with the same physical size of the aperture are equivalent.

The reason this topic is the source of so much debate is that "equivalent" means different things to each of us, because we all come to the table with different goals and priorities.

If I were to buy into the M43 system, it would be in the full knowledge of the limitations that come with the reduced sensor size.   I'd be choosing M43 because I deem it "good enough" for the kinds of pictures I take and the uses to which I put them.   In other words, I'd be accepting the fact that I'd have a smaller envelope of shooting conditions under which I can get the kind of shots I want.

Given that fact, as long as I'm shooting pictures within that envelope, a 12-35mm f/2.8 lens on an M43 camera will let me do the same things as a 24-70mm f/2.8 lens on a full frame camera.  In that sense, for my needs I'd consider the two lenses to be "equivalent".

Taking pictures from the same position under the same conditions with a 12/2.8 m43 and 24/2.8 FF will produce different DOFs and, assuming similarly efficient sensors, different amounts of noise.  For many, that would mean the lenses are not equivalent.  Are DOF and noise unimportant picture characteristics for you?

Oh, brother. Over acting 101

Personally, I most often want deep DOF and don't consider noise the most important photo characteristic.  I wouldn't mind the advantages of FF but consider the cost in weight and size too high.

Anyway, considering the differences in DOF, the lenses are not "equivalent."

So you bought into a system knowing full well there are compromises to accept. Like with DOF.   But do you REALLY care as much as you say?  I mean, really?   Do you shoot with µ4/3 but with a FF equivalence setting in mind to guide you?

[How's that for drama?   [g] )

We learn the differences IF coming from a FF frame of reference, but mainly we learn a format's pros/cons.   Then those are, simply put, exploited through our best abilities.   I get equivalence, but it seems to give those that ingest too much of it a false sense of superiority.

-- hide signature --

...Bob, NYC
"Well, sometimes the magic works. . . Sometimes, it doesn't." - Little Big Man

 Bob Tullis's gear list:Bob Tullis's gear list
Sony RX1R II Sony Alpha 7R II Fujifilm X-T2 Zeiss Batis 25mm F2 Zeiss Batis 85mm F1.8 +11 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow