A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
Great Bustard
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Re: You most important point
In reply to Just Having Fun, Apr 2, 2013

Just Having Fun wrote:

Great Bustard wrote:

Lastly, one doesn't choose a particular system to get images which are equivalent to another system.  Instead, one chooses a particular system for the best balance of the factors that matter to the them, such as price, size, weight, IQ, DOF range, available lenses, and/or operation.  By understanding which settings on which system create equivalent images, the difference in their capabilities is more easily understood.

In other words, simply because 35-100mm f/2.8 on mFT is equivalent to 70-200mm f/5.6 on FF, it doesn't make one "better than" the other.  But it may well have a great deal with why one chooses one system over the other, or, in fact, why so many seem to enjoy both.

I almost wish everyone would ignore everything else and only remember your last point.

If it's all the same to you, it would be nice if they maybe understood the other stuff, too. 

People who say a 20mm F/1.7 m43 lens is the same as a 40mm F/3.4 lens are silly.

Agreed.  The lenses are equivalent, but not the same.  For example, consider the Canon 50 / 1.4 on FF vs the Sigma 50 / 1.4 on FF -- the lenses are equivalent, but most definitely not the same.

There aren't that many 40mm F/3.4 lenses, and since the AR is different you are most likely to adjust you shooting location based on that alone.

Although, in this specific instance, Canon does have a 40 / 2.8 pancake which compares well on FF to the 20 / 1.7 on mFT.

Oh well.  People need to be happy with what suits them best...

Absolutely.

...and ignore everything else.

I wouldn't go that far.  Equivalence is part of the equation to helping understand the differences between systems.  So, if you are considering switching systems, Equivalence is a useful framework to consider.  That said, it's but part of the equation in that decision.

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