Re: [Leica] Digilux 2

["Howard L Ritter, Jr" <hlritter@mindspring.com>]

Jay--

Thanks for the explanation. I knew that if the focal-length equivalencies
given by Leica were correct, the sensor had to be 1/4 of the linear
dimensions of the 35mm frame, or about 9mm x 6mm. The Digilux uses the 4:3
ratio apparently, which I think makes more sense than the usual 35mm 3:2.
After all, who prints 8 x 12 enlargements?

Preposterous that Leica should be using such arbitrary, inexact, and
nonquantitative nomenclature in the 21st Century!

Anyone have any inklings of price or date?

- --howard


- ----- Original Message ----- 
From: "Jay Burleson" <jayburleson@earthlink.net>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Monday, December 15, 2003 11:32 PM
Subject: RE: [Leica] Digilux 2


> Howard,
> A 2/3 sensor is 8.8 x 6.6mm, with a diagonal of 11mm.
>
> (below is copied from
> http://www.dpreview.com/news/0210/02100402sensorsizes.asp)
>
> "We regularly receive emails from readers confused as to the actual size
of
> sensor used in digital cameras. Sensors (CCD / CMOS) are often refered to
> with an imperial fraction designation such as 1/1.8" or 2/3", this
> measurement actually originates back in the 1950's and the time of Vidicon
> tubes. Those who find the specification sheets for these sensors are then
> even more confused about the relationship between the fraction and the
> actual diagonal size of the sensor. Inside you'll find an explanation and
a
> table of common sensor sizes. We'll be adding this information to our
> glossary for future reference.
> It all started way back when...
> The 'Type' designation given to toady's CCD sensors is that it harks back
to
> a set of standard sizes given to TV camera tubes in the 50's. These sizes
> were typically 1/2", 2/3" etc. The size designation does not define the
> diagonal of the sensor area but rather the outer diameter of the long
glass
> envelope of the tube. Engineers soon discovered that for various reasons
the
> usable area of this imaging plane was approximately two thirds of the
> designated size. This designation has clearly stuck (although it should
have
> been thrown out long ago). There appears to be no specific mathematical
> relationship between the diameter of the imaging circle and the sensor
size,
> although it is always roughly two thirds."
>
> Read more at the link above.
>
> Jay Burleson
> “Every normal man must be tempted at times to spit on his hands, hoist the
> black flag, and begin slitting throats.”
> H. L. Mencken
>
>
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