A reminder for some memebers as to what the F stop is all about.

Started Jan 26, 2014 | Discussions thread
Sergey_Green Forum Pro • Posts: 11,993
You think so?

Great Bustard wrote:

Of course, 4/3 lenses are sharper than FF lenses, which offsets that advantage for FF somewhat. That is, if a 4/3 lens is twice as sharp as a FF lens, it will resolve as well as a FF lens for sensors with the same pixel count and AA filter.

I don't believe this is necessarily true. They are told to be sharper because they resolve more lines per mm, but that is only because those lenses are tested with the sensors that have the highest pixel density. Third party lenses that are ported and adapted to different formats show that twice as sharp Olympus lenses are nothing but the myth.

Take Sigmas for example, many on this very same forum will agree that Sigma 17-50/2.8 will indeed deliver more detail than the celebrated Zuiko 14-54 (Bootstrap made several comments on it, even Ray agreed and echoed it), whereas the same Sigma is not necessarily the best or better lens than many Nikon equivalents when used on APS-C cameras. Or Sigma 150 macro, whenever there is a mention of it on this very same forum you will hear nothing but a praise. Yet again, Nikon 105 and Nikon 200 are at least as good if not better alternatives. I tried Tamron sp90 in the past, it was very much the same story - excellent lens on FT, good but not the best on APS-C.

And of course, how many times do we hear how good 50-200 is, some will not even change to the system that does not have such a lens, yet it is not really that great when you spend time and really compare it.

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- sergey

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