Table:
0
A
B
C
D
E
1
Brand
Product Name
Focal Length
35mm EFL and equivalent aperture
Max. aperture
2
Olympus
Olympus M.Zuiko Digital ED 12mm f/2.0
12mm
24mm f /4
f /2.0
3
Olympus
Olympus 15mm f/8.0 Body Cap
15mm
30mm f /16
f /8.0
4
Olympus
Olympus M.Zuiko Digital 17mm f/2.8
17mm
34mm f /5.6
f /2.8
5
Olympus
Olympus M.Zuiko Digital 17mm f/1.8
17mm
34mm f /3.6
f /1.8
6
Olympus
Olympus M.Zuiko Digital ED 45mm f/1.8
45mm
90mm f /3.6
f /1.8
7
Olympus
Olympus M.Zuiko Digital ED 75mm f/1.8
75mm
150mm f /3.6
f /1.8
8
Panasonic
Panasonic Lumix G 14mm f /2.5 Asph.
14mm
28mm f /5
f /2.5
9
Panasonic
Panasonic Lumix G 20mm f /1.7 Asph.
20mm
40mm f /3.2
f /1.7
10
Panasonic
Panasonic Lumix G 20mm f /1.7 II Asph.
20mm
40mm f /3.2
f /1.7
11
Panasonic
Panasonic Leica DG Summilux 25mm f /1.4 Asph.
25mm
50mm f /2.8
f /1.4
12
Panasonic
Panasonic Leica DG Nocticron 42.5mm f /1.2
42.5mm
85mm f /2.4
f /1.2
13
Panasonic
Panasonic Lumix G 150mm f /2.8
150mm
300mm f /5.6
f /2.8
14
Schneider Kreuznach
Schneider Kreuznach Super Angulon 14mm f /2.0
14mm
28mm f /4
f /2.0
15
Schneider Kreuznach
Schneider Kreuznach Xenon 30mm f /1.4
30mm
60mm f /2.8
f /1.4
16
Sigma
Sigma 19mm f2.8 DN
19mm
38mm f /5.6
f /2.8
17
Sigma
Sigma 19mm f2.8 EX DN
19mm
38mm f /5.6
f /2.8
18
Sigma
Sigma 30mm f2.8 DN
30mm
60mm f /5.6
f /2.8
19
Sigma
Sigma 30mm f2.8 EX DN
30mm
60mm f /5.6
f /2.8
20
Sigma
Sigma 60mm F2.8 DN
60mm
120mm f /5.6
f /2.8

Questions and formulas:
Question: What is the maximum aperture of the lens(es) with a focal length of 20mm?
Formula: FILTER(E1,C1="20mm")
Formula2: FILTER(E2:E20,C2:C20="20mm")
Level: easy
Question: What is the 35mm EFL and the equivalent aperture of the lens(es) with a maximum aperture of f /2.5?
Formula: FILTER(D1,E1="f /2.5")
Formula2: FILTER(D2:D20,E2:E20="f /2.5")
Level: easy
Question: What is the brand of the Sigma 30mm f2.8 DN, which has a maximum aperture of f /2.8 and a focal length of 30mm?
Formula: FILTER(A1,(E1="f /2.8")*(C1="30mm")*(B1="sigma 30mm f2.8 dn"))
Formula2: FILTER(A2:A20,(E2:E20="f /2.8")*(C2:C20="30mm")*(B2:B20="sigma 30mm f2.8 dn"))
Level: easy