But Tech Pan resolves 320 lines per mm, so we need 320 x 2 x 25.4 = 16,256 ppi
At 15:48 1999/10/21 +1000, you wrote:
>"George M. Anderson" <george@xxxxxxxxxxxxxxxxxx> moved upon the face of
the 'Net and spake thusly:
>>
>> Pixels per inch is like film grain and again the bigger the number the
>> better. If you want to get a large (16x20 or better?) print from your
>> slide, you need the highest ppi you can get. To put things in
>> perspective though, if Kodachrome 25 resolves 100 lpmillimeter and your
>> lens can too, that's 25,400 ppi. So at 4000, you still aren't seeing
>> everything the film has to offer.
>
>100 lines per millimetre is 200 pixels per millimetre.
>
>200px times 25.4mm is 5080 ppi.
>
>cjb.
>
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