FocalLength (FocalLengthIn35mmFormat): MaxApertureValue - in terms of exiftool 9.4 mm (24 mm): f/1.8
9.5 mm (24 mm): f/2.0
9.6 mm (24 mm): f/2.0
9.7 mm (24 mm): f/2.0
9.8 mm (25 mm): f/2.0
10.0 mm (25 mm): f/2.0
10.1 mm (25 mm): f/2.2
10.2 mm (26 mm): f/2.2
10.4 mm (26 mm): f/2.2
10.4 mm (27 mm): f/2.2
10.5 mm (27 mm): f/2.2
10.6 mm (27 mm): f/2.2
11.0 mm (28 mm): f/2.5
11.1 mm (28 mm): f/2.5
11.2 mm (29 mm): f/2.5
11.3 mm (29 mm): f/2.5
11.4 mm (29 mm): f/2.5
11.5 mm (29 mm): f/2.5
11.8 mm (30 mm): f/2.5
12.4 mm (32 mm): f/2.8
12.5 mm (32 mm): f/2.8
13.2 mm (34 mm): f/2.8
13.6 mm (35 mm): f/2.8
13.8 mm (36 mm): f/2.8
14.1 mm (37 mm): f/2.8
14.9 mm (39 mm): f/2.8
15.5 mm (41 mm): f/2.8
15.7 mm (41 mm): f/2.8
17.2 mm (45 mm): f/2.8
17.4 mm (46 mm): f/2.8
17.8 mm (47 mm): f/2.8
19.2 mm (51 mm): f/2.8
20.5 mm (55 mm): f/2.8
20.9 mm (56 mm): f/2.8
23.8 mm (64 mm): f/2.8
24.4 mm (66 mm): f/2.8
25.7 mm (70 mm): f/2.8
This shows the dependency of the wide open aperture on the real focal length (and the equivalent focal length). For example, the f/1.8 aperture is available at the shortest focal length only. It suddenly becomes f/2.0 at a slightly longer focal length.
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