f number

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f-number

, f number
Photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture

f number

[′ef ‚nəm·bər]
(optics)
A lens rating obtained by dividing the lens's focal length by its effective maximum diameter; the larger the f number, the less exposure is given. Also known as focal ratio. Also known as stop number.
References in periodicals archive ?
Source Sum of Degree of Mean F-value Prob>F squares freedom square Model 5953.
Table 7 shows that when adding size as an independent variable, the results yielded a highly statistically significant model with an F-value of 56.
TABLE 6 - ANOVA RESULTS FOR THE VARIATION IN PROJECT OUTCOME ACROSS PROJECT TEAM SIZE Small Medium Large F-value P-value Mean SD Mean SD Mean SD Time 6.
p] Factor F-value Prob % p Adeq P F-value Prob % p > > F F [A] [B] 2.
67 Table 4: Impact of R&D on Tobin's q All Firms 51,223 Observations F-Value = 1198.
In addition, F-value and coefficient of variation analysis for measured parameters were conducted.
To prove the proposed hypothesis ANOVA test was performed and it is found that the F-value is 8.
ANOVA results show that the calculated F-value is more than the table value and hence it is inferred that there is a significant difference among the respondents with different levels of repayment in their perception regarding the social benefits of bank credit.
The F-value is highly significant and the independent variables explain 92.