optional, single

—

Within <focallength> the focal distance of a lens used for a certain photo is put into brackets. The value is to be given as a real number in metres (!).

<imagedata>

—

<exposurecompensation>, <filmspeed>, <focusingdistance>, <image>, <imagedata>, <meteringmethod>, <shutterspeed>

(see also <image>)

<!-- 20 mm lens -->
<focallength>0.02</focallength>