Why do people think....

Started May 14, 2012 | Discussions thread
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Andy Crowe Senior Member • Posts: 1,587
Out of date rule

As a rough guide, take the longest focal length and divide it by the shortest focal length. If the answer is much over 3 than it's not so good. If it's over 5 then it will be awful.

That may have been true 10 years ago, but these days the zoom length has no real connection to IQ (size is another matter). For example, the Panasonic 14-140 10x zoom matches or beats the very well regarded Olympus 14-42 3x zoom at various focal lengths, and well out performs the Olympus 17mm f2.8 prime at the same focal length.

http://www.dpreview.com/lensreviews/widget/Fullscreen.ashx?reviews=57,12&fullscreen=true&av=4,4&fl=14,14&vis=VisualiserSharpnessMTF,VisualiserSharpnessMTF&stack=horizontal&&config=/lensreviews/widget/LensReviewConfiguration.xml%3F4

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