Request from DPR - attention Andy Westlake

Started May 22, 2012 | Discussions thread
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Re: Agree with your assessment
In reply to bobn2, May 24, 2012

bobn2 wrote:

boggis the cat wrote:

No, but they have introduced confusion such that some people take an "equivalence" argument about DOF and then start claiming that the exposures are different on different systems.

Can you find a link where anyone has said that exposures are different on different systems?

Yes, I could.

But you can't be bothered right now?

Would it matter if he could? Check boggis in action saying that 300mm f/2.8 on 4/3 "really is" 600mm f/2.8 on FF and 300mm f/2.8 on the Nikon 1 system "really is" 810mm f/2.8 on FF:

http://forums.dpreview.com/forums/read.asp?forum=1022&message=39410248

So, if boggis can say that 300mm f/2.8 on 4/3 "really is" 600mm f/2.8 on FF and 300mm f/2.8 on 2.7x "really is" 810mm f/2.8 on FF, well, it's no wonder that he is confused on other matters as well.

Still, as I said, I'd be pleased to see where someone said f/2 on 4/3 (mFT) "really is" f/4. For sure, someone must have misspoke and said it, but not nearly so often as people don't mistake and really mean to say f/2.8 = f/2.8, forgetting that the "f" stands for focal length, and 300mm / 2.8 = 107mm whereas 600mm / 2.8 = 214mm. Big difference, no?

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