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Lenses 101
the older Minolta film cameras or with any “full frame” (same size as
35mm) sensor, such as the Sony Alpha 900 or 99.
Figure 3-23: The sensors in APS-C digital cameras are smaller than that of a
standard 35mm frame, resulting in images that look more “zoomed in” when
shot in digital. This is what’s behind the 1.5 “crop factor” when using lenses
designed for full-frame cameras.
3.12.3 SONY AND MINOLTA LENS NOMENCLATURE
There is a lot of “nomenclature” involved with Sony’s lens labeling – for
example, the 100-300 APO (D) or the 70-200mm f2.8 APO G SSM AF
(now that’s a mouthful!). What does it all mean? Here’s a quick guide to
decode it all.
DT – This stands for for “Digital Technology”. These optics are optimized
for the unique needs of the digital sensor – the rear element is recessed
somewhat to minimize internal reflections, the exit rays tend to be
perpendicular to the sensor (especially in the corners), and (and this is
