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[OM] Re: what does medium format mean?

Subject: [OM] Re: what does medium format mean?
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Thu, 28 Mar 2002 18:28:25 +1200
Hi Kierstin,

One way to think about the different format sizes is this way.

Just suppose a set of lenses are all capable of clearly transmitting 45 
lines/pairs (black & white, for example) per millimetre of film width, and a 
set 
of photographs was taken with superlative care..

So, for the SAME subject, a 35 mm camera system would get on the 
negative 45 x 35 =  1575 line pairs (ideally) on the longest side.

A medium format camera with 6 x 9 cm negative (this is the big end of the 
medium format range) would get on the negative
45 x 90 =  4050 line pairs for the same subject.

A 4x5 inch camera would get 45 x 125 =  5625 line pairs on the negative for 
this subject.

It really depends on what you want. Other things being equal (which they 
seldom are), more negative means potentially more detail.

Brian
.............................................................
'Twas brillig, and the slithy toves          Voiceless it cries,
Did gyre and gimble in the wabe.         Wingless flutters,
All mimsy were the borogroves,           Toothless bites,
And the mome raths outgrabe.             Mouthless mutters.
                                                       
>From "Through the Looking-Glass"     Gollum's riddle to Bilbo<   
.                                        (A) = The wind.

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