EXCERPT page containing first few paragraphs. 2020-07-06 15:52:08
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For a general understanding of format equivalence, see Format-Equivalent Depth of Field and F-Stop.
Format equivalence quick summary, assuming 53.4 X 40.0mm IQ4 sensor vs 35mm*:
eDoF = equivalent Depth of Field
28mm f/4.5 ~= 19mm f/3.0 eDoF
35mm f/3.5 ~= 24mm f/2.4 eDoF
40mm f/4 ~= 27mm f/2.7 eDoF
45mm f/3.5 ~= 30mm f/2.4 eDoF
55mm f/2.8 ~= 34mm f/1.9 eDoF
80mm f/2.8 ~= 54mm f/1.9 eDoF
80mm f/4 ~= 54mm f/2.7 eDoF
110mm f/2.8 ~= 74mm f/1.9 eDoF
150mm f/2.8 ~= 101mm f/1.9 eDoF
240mm f/4.5 ~= 162mm f/3.0 eDoF
* Nominal 35mm sensor 36.0 X 24.0 mm. Some sensors are slightly smaller. Actual focal lengths of real lenses are often rounded, as are some f-stops e.g., f/5.6 is really f/5.657 ~= f/5.7.
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