Re: Pop Photo Resolution Lines Per ? MATH

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It's handy to regard unit conversions as though the units were algebraic symbols. They can then be cancelled. For example 2.54 cm/ in X 12 in/ft = 30.48 cm/ft. Inch is in the denominator of the first and in the numerator of the second. The two cancel. Take the last result and multiply by 3 ft/yd and you get 91.44 cm/yd as ft cancels. Take he reciprocal of this last result and you get 0.1094 yd/cm. It avoids a lot of errors.

Roger

On 14 May 2008, at 4:11 PM, PhotoRoy6@xxxxxxx wrote:


So Jim, Michael is right
( Further, your math is wrong. 2100/25.4 = 82 lines, which translates into 41 lp/mm. Keep in mind that these tests are at full contrast (i.e. Black lines
on white background) so comparison to normal 50% MTF is difficult.
)
which makes digital APS-C no where near to 35mm film in terms of resolution.
Thanks,
Roy



In a message dated 5/14/2008 8:48:08 A.M. Eastern Daylight Time,
jimth@xxxxxxxxxxxxxxx writes:

Your understanding of conversions between metric and imperial measurements
is decidedly limited.









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