What is considered fast?

Started 3 months ago | Discussions thread
John Mason
John Mason Veteran Member • Posts: 6,154
Fast is a relative term....

It just means for the available lenses for a particullar function, the Fast version of said lens would be at the wider end of things.

So a 24-105 F4 isn't at the wide end of that range while the 24-70 F2.8 is.  So the 24-70f2.8 might be called fast while the 24-105 would not typically be called 'fast'.

A 50mm F1.8 isn't fast because you can get an F1.4 and F1.2 of a 50mm.

Even though an F1.8 is a fast lens in that you can use it in low light, it's the comparison to other lenses for that category where most people will apply the term 'fast' to a particullar lens.

The other aspects of 'fastness' typically means you can get more 3d separation with a 'fast' lens as compared to it's less fast comparable lenses.

The term Fast also used to mean a lens you could shoot effectively in indoor availablle light situations.  These days, with clean shots from ISO 3200, that use of the term Fast has lost a lot of it's meaning.

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John Mason - Battle Ground, Indiana USA

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