Focal Length

If sifting through Google search results is any indication, I’m wading into fraught territory here. But in looking to acquire more lenses for my Pentax 645, I had to get some basic understanding of focal length equivalency, because my familiarity with what you get, picture-wise, with a lens of x millimeters in focal length is rooted primarily in the 35mm world — and to a lesser degree in Canon’s version of the APS-C world.

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