Table 2 Calculated performance parameters of a telemicroscope in dependence on the focal length (extension tube length: \(l=50\) mm; f-number: \(N=2.8\); sensor size: 7.04 mm × 5.28 mm; pixel size: 4.4 μm × 4.4 μm; circle of confusion: \(c_{\mathrm{max}}=0.0059\) mm)

4

54.0

4.3

12.50

0.56

0.42

0.98

4.30

4.34

0.04

0.35

0.7

8

58.0

9.3

6.25

1.13

0.84

3.90

9.26

9.30

0.04

0.70

1.4

16

66.0

21.1

3.13

2.25

1.69

15.60

21.09

21.15

0.06

1.41

2.8

25

75.0

37.5

2.00

3.52

2.64

38.07

37.46

37.54

0.07

2.20

4.4

33

83.0

54.8

1.52

4.65

3.48

66.33

54.73

54.83

0.09

2.90

5.8

50

100.0

100.0

1.00

7.04

5.28

152.24

99.93

100.07

0.13

4.40

8.8

75

125.0

187.5

0.67

10.56

7.92

342.51

187.40

187.60

0.21

6.60

13.2

100

150.0

300.0

0.50

14.08

10.56

608.87

299.85

300.15

0.30

8.80

17.6

150

200.0

600.0

0.33

21.12

15.84

1369.87

599.74

600.26

0.53

13.20

26.4

200

250.0

1000.0

0.25

28.16

21.12

2435.26

999.59

1000.41

0.82

17.60

35.2