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

Started Sep 18, 2012 | Discussions thread
GeraldW
Veteran MemberPosts: 6,167Gear list
Like?
Re: Wow & thanks Re: Lens physics? eg - Pana FZ200 f2.8 @ 60mm?
In reply to Jambsi, Sep 21, 2012

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.

-- hide signature --

Jerry

 GeraldW's gear list:GeraldW's gear list
Canon PowerShot A710 IS Panasonic Lumix DMC-FZ200 Canon PowerShot G15
Reply   Reply with quote   Complain
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow