Andrew Reed
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f/stop (f), Aperture (aptr), Focal Length (fl), & Aperture Area (Area)


aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area aptr Area
f 1.0 1.0 1.4 1.4 2.0 2.0 2.8 2.8 4 4 5.6 5.6 8 8 11 11 16 16 22 22 32 32
fl 25 25 512 18 256 13 128 9 64 6.4 32 4.5 16 3.2 8 2.3 4 1.6 2 1.1 1 0.8 .5
50 50 2049 36 1024 26 512 18 256 13 128 9 64 6.4 32 4.5 16 3.2 8 2.3 4 1.6 2
100 100 8195 72 4094 51 2049 36 1024 26 512 18 256 12.8 128 9 64 6 32 5 16 3 8
250 250 51216 181 25590 128 12804 90 6402 64 3199 45 1600 32 800 22.6 400 16 200 11 100 8 50
500 500 204863 361 102360 255 51216 181 25608 128 12797 90 6400 64 3200 45 1600 32 800 23 400 16 200
Actual Aperture Sizes for a 50mm Lens