On Tue, 9 Apr 2002, Christian Skofteland wrote: > If that's the case why doesn't the maximum aperture stay constant? > > In other words if I have a 60-300 f4-5.6 and I set it to 5.6 and zoom to 300 > am I still at 5.6? No, I need to set it at 4 to be at 5.6. Likewise if I > set it at f8 and zoom to 300mm will I still be at f8? I don't think so. I'd > be at f11 right? > > The question is: what is my f-stop when it is set at f8 and I'm zoomed to > 200mm? Answer: ??????
Len's wrong on this one, AFAIK. Variable-aperture zoom lenses do not keep the same aperture when they zoom, which is why they're variable and not fixed aperture lenses. Test with MZ-5n and 80-320mm f4.5-5.6 Lens set to f4.5; aperture readout in viewfinder: 80mm=f4.5, 320mm=f5.6 Lens set to f8; aperture readout in viewfinder: 80mm=f8, 320mm=f11 Lens set to f16; aperture readout in viewfinder: 80mm=f16, 320mm=f19 Lens set to f32; aperture readout in viewfinder: 80mm=f32, 320mm=f38 The aperture often has an intermediate value that appears as I zoom the lens between its extreme focal lengths. chris - 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 .
