What exactly is the advantage of constant aperture in a zoom lens?

Started Jan 20, 2013 | Discussions thread
waynes
Contributing MemberPosts: 917
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Re: What exactly is the advantage of constant aperture in a zoom lens?
In reply to rogerstpierre, Jan 21, 2013

rogerstpierre wrote:

To me it's pretty obvious. The longer the FL the more speed you need. Non constant aperture = slower speed when you actually need more speed. Not a good idea.

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Roger

So true.

If 18-135 had reversed f3.5-5.6, it would be an unbeatable lens!  Not the speed, but the DOF.

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