The Sony RX10 is a Bargain!

Started Oct 16, 2013 | Discussions thread
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Richard Murdey
Richard Murdey Senior Member • Posts: 2,294
Re: The Sony RX10 is a Bargain!

SunnyFlorida wrote:

32mm/1.2= 26.7mm

73.3mm/2.8= 26.18mm

(the physical aperture of zooms is measured at the long end / aperture

The math may be numerically accurate, but the resultant value is physically without basis or merit. You can't "divide out" by the maximum aperture like that! (though in the telephoto range it has some correlation with "relative complexity" I suppose, i.e. a 400mm F4 is about as hard to build as a 800 F8.)

Back on topic, a 32/1.2 has no equivalency with 73.2/2.8.

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