Lens physics? eg - Pana FZ200 f2.8 @ 60mm?

Started Sep 18, 2012 | Discussions thread
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GeraldW Veteran Member • Posts: 7,336
Re: Wow & thanks Re: Lens physics? eg - Pana FZ200 f2.8 @ 60mm?

If you go back and look at the specifications for early zoom lenses in the late 60's; you'll find a constant aperture was common. As time went on zoom lenses began to have variable apertures to get smaller, lighter, and easier to design and manufacture lenses. This trend has continued to the present, particularly for DSLR's

In the 60's and early 70's a fixed aperture lens made life a lot easier for the photographer as the cameras didn't yet have program exposure mode or TTL flash; both of which compensate for the change in aperture. The older aperture priority cameras and sensor flash units both work a lot easier if the lens aperture doesn't change when you zoom.

The emergence of Program auto cameras and TTL flash freed the lens designers and made variable aperture zooms a lot more palatable for the photographer - I know it did for me.

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