You can't precisely tell what the aperture is on a variable aperture lens, except at the extremes, so you can't make precise exposures by using a hand-held meter. And it probably gets more complicated when you've stopped the lens down somewhat. What's the range when the lens is set at 5.6 at 35mm? Do you even know what it is at 80mm, much less in between?
Variable aperture zooms are designed to be used with TTL metering. Welcome to the world of Newphotography. It sometimes is a real PITA. Denny B wrote: > > If one uses an external lightmeter when using a variable aperture > zoom lens will you have a problem, for example with a > 35-80mm F/2.8- 3.8. As I understand this zoom it is > F 2.8 at 35mm and 3.8 at 80mm most of the time one is not > on these end aperture's. I assume in-between 35mm and 80mm > the aperture varies between F 2.8-3.8 > > How specifically does one take a proper light reading > with an external lightmeter using a variable aperture zoom lens. -- Shel Belinkoff mailto:[EMAIL PROTECTED] http://home.earthlink.net/~belinkoff/ http://home.earthlink.net/~belinkoff/darkroom-rentals/index.html - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
