Okay, someone is going to point out that the reciprocal of 91.44 is
0.01094 (to five significant figures), not 0.1094 as I wrote. I might
as well do it myself. My bad!
Roger
On 14 May 2008, at 5:14 PM, Roger Eichhorn wrote:
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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