[OM] Re: What to buy, what to buy.

[Chuck Norcutt]

A 4/3 sensor is 17.3x13mm and when cropped to A4 (sq. root of 2) ratio 
gives 17.3x12.2mm for a total area of 211.06 square mm.  A Canon 1.6X 
crop sensor is 22.2x14.8mm and when cropped A4 is 20.9x14.8mm for a 
total area of 309.32 square mm or 46.6% larger.  A Nikon 1.5X crop 
sensor is 23.6x15.8mm and when cropped A4 is 22.3x15.8 for a total area 
of 352.34 square mm or 47.7% larger.  A Canon 5D sensor is 35.8x23.9mm 
and cropped A4 is 33.8x23.9mm for a total area of 807.82 square mm or 
383% larger.

Cropping A4 is not favorable to 4/3 format.

Chuck Norcutt


Andrew Fildes wrote:
> I'm sorry but the rest of the world prints A4 - come on, you know it  
> makes sense.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
> 
> 
> 
> On 07/05/2008, at 11:45 PM, Chuck Norcutt wrote:
> 
>> A 4/3 sensor is 17.3x13mm and when cropped to 8x10 ratio gives
>> 16.25x13mm for a total area of 211.25 square mm.  A Canon 1.6X crop
>> sensor is 22.2x14.8mm and when cropped 8x10 is 18.5x14.8mm for a total
>> are of 267.14 square mm or 26.5% larger.  A Nikon 1.5X crop sensor is
>> 23.6x15.8mm for a total area of 312.05 square mm or 47.7% larger.  A
>> Canon 5D sensor is 35.8x23.9mm and cropped 8x10 is 29.88x23.9mm for a
>> total area of 714.13 square mm or 338% larger.
>>
>> Sorry, but I don't find much parity in these numbers.
> 
> 
> 
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