Boris Liberman wrote:
On 11/8/2010 7:37 PM, Mark Roberts wrote:
The crop factor is determined by how many pixels are masked off at the
edges of the sensor.
Mark, it would /really/ surprise me if after so many cameras with exactly
1.53 crop factor, Pentax decided to introduce K-5 with slightly different
crop factor.
Boris
Boris, while usually stating 1.5 as the nominal crop factor for Pentax
DLSR's, the actual factor can vary according to the sensor in use (taking
into account both its true size and the masked off pixels). This is a new
sensor, hence it can well sport a new crop factor. Then, the different crop
factors among the manufacturers using the same sensor can depend on:
1 - Number of effective pixels used.
2 - Rounding off for preventing odd data such as 1.5274 crop.
3 - Marketing (which can suggest a different rounding off, for the sake of
looking different from other manufacturers).
Dario
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