The Sony RX10 is a Bargain!

Started Oct 16, 2013 | Discussions thread
Richard Murdey
Senior MemberPosts: 1,601Gear list
Re: The Sony RX10 is a Bargain!
In reply to SunnyFlorida, Oct 20, 2013

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.

 Richard Murdey's gear list:Richard Murdey's gear list
Nikon D40 Pentax K10D Nikon 1 V1 Nikon D600 Pentax smc FA 31mm F1.8 AL Limited +5 more
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow