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Forum: Pentax DSLR Discussion
11-02-2017, 11:34 AM
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No, that is wrong.
The first problem is that a most important part is missing from your statement: equivalent to what?0
The second problem, obvious once we answer the first: there's no point for an APS-C user to relate to a system he's not using (FF). Conversion factors are an unnecessary complication.
The third problem is the temptation to apply those unnecessary conversion factors to FF lenses only (instead of all the lenses). Which I get the feeling it's happening here.
The proper answer is: the focal length is independent of the sensor size, period. It's also independent of the lettering on the barrel (e.g. those DA, D FA etc.markings)
So you can directly compare the 70-200mm with the 55-300, and at every common focal length the angle of view will be the same (camera being the same format, of course).
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