The recent inclusion of an index of heifketzschmeckliet* in the recent review of digital lenses in the UP Journal "Boxes" seems to have caused some little controversy in America. Proponents of the positivistic side of the forerunners of this have been largely from the eastern and mid-west states. Their opponents, including a number of members of the "Tacoma Club", as they are known in The Dalles, hold quite the opposite view.
There may be something in what they say - the heif index is a lot more negative in areas of high UV - the western states are rife in this, what with the pine trees - and it probably affects a lot more of the images taken there than in the east. Here in Australia it remains to be seen if the local eucalypts would have the same effect but it is safe to say that the heif reading should be taken with a calibrated meter before any scientific or professional shoots. No good having to apply it artificially at post-processing - and this is rarely successful in competitions, anyway.
* The German term for the inner sense of externality in images where it partially or completely supercedes depth of aperture. It has also been know in Silesia as apertukia.
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