A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
forpetessake Veteran Member • Posts: 4,892
Re: A few words on Equivalence and comparing systems

MatsP wrote:

Just another Canon shooter wrote:

No. The Olympus 40-150 is sharper, I would even say a lot sharper, than the EF-S 55-250. I had that lens once but I sold it. It's well regarded but I was disappointed. The 40-150 is astonishingly good, and if you think of the price for it it's almost unbelievable.

In all respects  that GB listed the 40-150 is equivalent to a FF 80-300/8-11,2, but when I take a picture with it I regard it as a 40-150/4-5,6, which it is, and it gives me the same FOV and same exposure. But deeper DOF and a little more noise, theoretically at least.

You can look at another APS-C lens which is much closer to Olympus 40-150/4-5.6 (FF eq. 80-300/8-11.2), that is Sony 55-210/4.5-6.3 (FF eq. 82.5-315/6.75-9.45): http://www.dpreview.com/products/compare/side-by-side?products=sony_e_55-210_4p5-6p3&products=oly_m_40-150_4-5p6_r

The lens, not surprisingly, has better resolution on APS-C than Olympus on m4/3. The lens is longer and heavier, though as a part of the system it's hardly noticeable, but it's also 40% faster, and unlike Olympus it has high build quality with metal barrel. I would expect if the manufacturer used plastic and made lens slower it would have been the same weight as Olympus, though I'm sure the buyers would rather opt for 5 oz extra weight in exchange for better image quality, build, and speed.

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