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Effective focal lengths for digital cameras with various crop factors

Written by Steve - Presented by Pixalo

If the digital sensor is the same size as a frame of 35mm film (i.e 24 x 36mm)then lenses designed for 35mm cameras used on digital cameras would give the same magnification.

With most digital cameras however, other than the full frame sensor models, the sensor is slightly smaller in size than a 35mm frame. This means that when you use a lens designed for 35mm cameras on a digital camera there will generally be an increase in apparent focal length or magnification of about 1.3 - 1.6 times. This is of course visible in the viewfinder of the digital SLR but the table below shows the effective focal lengths when used at different crop factors.


35mm camera

Full frame

1.3 x crop

1.6 x crop

 

24 x 36mm

35.8 x 23.8mm

28.7 x 19.1mm

22.7 x 15.1mm

 

Focal Length in mm

Approx focal length of lens in mm designed for 35mm cameras when used on Digital

 
 
 
 

14

14

18

22

15

15

20

24

16

16

21

26

17

17

22

27

20

20

26

32

24

24

31

38

28

28

36

45

35

35

46

56

40

40

52

64

45

45

59

70

50

50

65

80

65

65

85

104

70

70

91

112

75

75

98

120

80

80

104

128

85

85

111

136

90

90

117

144

100

100

130

160

105

105

137

168

135

135

176

216

180

180

234

288

200

200

260

320

300

300

390

480

350

350

455

560

400

400

520

640

500

500

650

800

600

600

780

960

1200

1200

1560

1920