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1. A single focal length, fixed-focus is often sufficient.

2. Properties of a parabola All parabolas are similar. Focal length a determines the magnitude.

3. You can set focal length for Lens distortion compensation.

4. The relation between the focal length of a concave lens and its reflective image properties is analysed and deduced.

5. A discussion is made regarding scaling focal length, optimization of stop distance and saving the time for OTF calculation.

6. Focal length is the distance between optical centre and principal focus.

7. The influences of pump energy, focal length and distance between fiber and lens on SBS reflectivity and waveform in multimode fiber are investigated theoretically and experimentally.

8. The scanner's baseline correction including focal length adjustment and brightness, contrast white balance, color, tuning, etc.

9. A typical lens has a focal length ( f ) of 625 mm.

10. Always look for focal length, which is rendered in terms of "35mm equivalent, " or what it would be comparable to in a 35mm film camera.

11. The focal length of the camera lens plays an important role in photo criteria.

12. The unifocal standard lens has a focal length equivalent to 47mm in the 35mm format.

13. Focal length: The distance between the centre of a lens and its principal focus.

14. This does cause a problem in that you need shorter focal length lenses to obtain the same effect.

15. The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.

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16. This paper proposes a new method for estimating the equivalent focal length of digital camera (DC) charge-coupled device (CCD) to the traditional optical camera.

17. If you know the focal ratio but not the focal length, you can calculate it: focal length is the aperture (in mm) times the focal ratio.

18. The current pre-marital property ownership of marriage earnings on deposit interest main focal length, the rent income, real estate appreciation and stock profits.

19. The aperture size (area of the aperture) of a lens could be calculated from focal length and the correspondent f-number.

20. The . target is actually a rectangular Fresnel lens with the correct focal length so that an image of the light source is formed on the plane of the detector.

21. The more small the size of input image is and long the focal length is, the more small the error is.

22. The more light pass through, the lower F number is. Shown in the following figure, F is the ration of focal length and effective diameter.

23. Effective relative aperture of the lens aperture (beam diameter) and the ratio of focal length.

24. The compound microscope consists of two convex lenses with short focal length, the objective and eyepiece lenses, fitted at opposite ends of a tube.

25. If the objective lens is further away from the compact disk than the focal length of the object lens, then the cylindrical lens again creates an elliptical image on the photodetector array.

26. When a tiny servomotor compresses a circular periphery seal that acts like an iris diaphragm, the shape of the membrane grows convex, modifying the fluidic lens's focal length.

27. This paper presents formula to calculate the scanning frequency, scanning angle, scanning width and excessive focal length of the wide-band laser scanning device.

28. Experimental structure and results of a new type of solid-state power combiner with short focal length open cavity are presented in this paper.

29. The laser light is delivered along a fibre optic cable to a laser head with a focal length of 120 mm.

30. By infrared thermal imaging techniques in this thesis, the focal spot size and focal length of this dielectric lens antenna are measured.