Is my thinking about equivalence right?

Started 3 months ago | Questions thread
xpatUSA
xpatUSA Forum Pro • Posts: 20,125
Re: Is my thinking about equivalence right?

Muster Mark wrote:

Hi all, I realize this is NOT the topic everyone loves to discuss and I totally understand. I hope no-one feels annoyed by this post. That said, after some investigation I have come to the conclusion that "traditional" equivalence math is only useful as a rough heuristic to get a sense of what DOF will be and NOT a reasonable way to compare individual lenses or judge cost/performance of lenses in different systems.<>

If there is anything I should be accounting for that I am not (and you know how I might, e.g. t stops) I'd be curious to hear.
--
Cheers,
-Ian

You might find this to be of interest. It places an emphasis on actual aperture diameter rather than f-numbers.

http://www.trenholm.org/hmmerk/TIAOOFe.pdf

As to equivalence, Falk Lumo is my Guru:

http://www.falklumo.com/lumolabs/articles/equivalence/index.html

-- hide signature --

Pedantry is hard work, but someone has to do it ...

 xpatUSA's gear list:xpatUSA's gear list
Panasonic Lumix DMC-LX1 Sigma SD9 Panasonic Lumix DC-G9 Panasonic Leica DG Macro-Elmarit 45mm F2.8 ASPH OIS Sigma 17-50mm F2.8 EX DC OS HSM +14 more
Post (hide subjects) Posted by
Yxa
Yxa
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow