Why do older camera lenses have faster F-stops?

Started Apr 14, 2013 | Discussions thread
Barrie Davis
Barrie Davis Forum Pro • Posts: 21,460
Re: Why do older camera lenses have faster F-stops?

SergioNevermind wrote:

Older film lenses, specially in the manual focus era (pre 90's) had to deal not only with limited ISO film but also with the ability to allow you to focus manually using in the best case a split image viewfinder. A brighter lens wide open may not be sharp, but it will help you focus, and then stop down and then click.

So autofocus, plus digital sensors capable of getting higher ISO than film with decent results, gave designers the chance to make MUCH MORE CHEAPER lenses, just as APSC kit zooms, e.g. 18-55 f 3,5-5,6. Won't get any DOF at any focal length out of that.


Errr... do you mean, "won't get any SHALLOW DoF out of that...??"
"Ahh... But the thing is, these guys were no ORDINARY time travellers!"

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