Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
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copyright status
copyrighted, dedicated to the public domain by copyright holder
copyright license
released into the public domain by the copyright holder
captured with
Canon EOS 350D
ISO speed
100
exposure time
0.005 second
f-number
9
focal length
100 millimetre
data size
179,736 byte
height
657 pixel
width
1,024 pixel
media type
image/jpeg
checksum
d1d7dfaddc9cdc1c85a5f6c27418314f39075947
determination method or standard: SHA-1
instance of
photograph
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{{Information |Description= {{en|Uncooked ''gemelli'' pasta with an American quarter for scale.}} {{fr|Pâtes ''gemelli'' non cuites avec une pièce de monnaie américaine.}} {{it|Gemelli non cotto.}} |Source= English-language Wikipedia |Date= uploaded to