Error in M9 Brochure ...

[rick_dykstra]

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I've pretty well always used ISO100 with my R8s. On a sunny day down here ambient exposure will be correct at ISO 100, f8 and 1/250th. I was wondering how I would work with the 1/180th flash sync of an M9.

 

So, ISO 100. Hmm, that's 21, right? So that makes ISO 80 = 20???

 

Nope. On page 74 of the 2009 M9 catalogue Leica says:

 

[ATTACH]166668[/ATTACH]

 

Well what's 20 then? Huh?

 

I reached for my R8 and fiddled with the rear LCD buttons. 80 is one down from 100. It can't be 19!

 

I needed independent confirmation, verification, validation. I needed the truth!! There was only one place to look.

 

Wikipedia!

 

[ATTACH]166665[/ATTACH]

 

Question is, what does it say on the real M9? Can early adopters have their free filters now?

[gravastar]

DIN = 10(log ASA)+1 and ASA = antilog((DIN - 1)/10)

 

ASA --------- DIN (Kodak) ------- DIN (Calculated)

 

64 ---------------19 --------------------- 19.06

 

80 ---------------20 ----------------------20.03

 

100 ------------ 21 --------------------- 21.00

 

So it looks as if you're correct, there's an error. At first I wondered if there may be a rounding error in published figures but that doesn't account for it.

 

ETA: Reading Thorsten's comment below reminds me. Now where did I put that flash powder? hmmm... DIN 17, f25 that's 6ft: 1 gram 12ft: 2.5 grams 24ft: 7 grams 36ft: 12 grams.

 

Bob.

[Overgaard]

There's no other ISO than 80, 160, 200, etc. on the M as far as I can tell.

 

DIN and ASA is a leftover (as is GOST) that stopped in 1987 when ISO took over as the international standard. But it doesn't surprise me that a German company still mentions DIN values as well