Primes > Zooms All Other Things Being Equal?

Started Jan 30, 2013 | Discussions thread
Forrest Forum Pro • Posts: 14,666
Re: Lenses get better as you stop them down...

BAK wrote:

By the time you get both to f4, more often than not, and depending on the subject and the light and the size of the image and the kind of paper it is printed on, and the quality of the monitor, and the resolution of the TV and the lens quality on the video projector, there's probably no difference that matters.

This may be true of expensive and heavy f/2.8 zooms.  A lot of zooms save money and ballast by having slower apertures, and variable ones throughout their range as well.  So, by the time you stop that prime to f/4 and approach its peak resolving power, the zoom may still be wide open, or it may not even be able to open so wide!

My Sigma 15-30 EX, for example, is f/3.5 at the wide end and I believe it's f/4.5 at the long end.  It's collecting dust, too.

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