0
What is back focal length and if CCTV camera with higher back focal length is better or with lower back focal length is better?
Wiki User
∙ 11y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What is a calibrated focal length?
A calibrated focal length is an adjusted value of the equivalent focal length on a camera, so as to equalize the positive and negative values of distortion over a field.
What uses a long focal length a short focal length lens and has an inverted image?
a camera? Or an eye? Something like that. Weird question
How do you calculate the hyperfocal distance on a digital camera?
normally, the digi cams have a lens of focal length 16mm. The hyper focal length starts at 2 meters away from the camera, as a thumb rule
What kind of PS digital camera can you get with a wider view than the standard shorter focal length so you can take shots in tighter spaces?
Your going to have to do some research and look at the focal length on cameras. The smaller the number the wider the angle. You want a camera with a small focal length.
What does MM stand for in digital cameras?
The MM is the focal length in millimeters. The focal length would be the distance between the lens and the back of the camera where the image is formed.
Is a lens of 50 mm focal length or 5 cm focal length better to read a dictionary?
5cm and 50mm are the same thing.
What does mean the mm e.g. 18 -200 mm camera or 55-200 mm?
That number is the focal length of the camera's lens ... which focuses light from the scene to form an image on the 'film' or CCD inside the camera. The longer the focal length of the lens, the larger (nearer) the objects appear to be in the picture. (One radian of angle as seen by the lens ===> One focal length on the film.) On the cameras described in the question, the focal length is given as a range ... "from 18 to 200 mm", and "from 55 to 200 mm". Each of these is a "zoom" lens, whose focal length can be changed over the range, enabling the user to cause objects in the picture to appear somewhat nearer or farther away.
How do you convert optical zoom into 35 mm terms?
I'm not sure I understand your question. If I do, the conversion from focal length of a digital camera to an equivalent 35mm focal length varies based on the cameras sensor size. These sizes vary by camera model. For most Digital SLRs you multiply the camera's focal length by about 1.6, but the multiplier ranges from 1.5 to 2. The multiplier for simple/consumer non-DSLR cameras is somewhere around 4 times.
What is zoom lens?
A zoom lens is a lens of a camera which contains a mechanical assembly of inner lenses, which allow the focal length of the camera to be rapidly altered.
How is camera lens focal length related to zoom or magnification?
The longer the focal length the greater the zoom or magnification. If this was not your question go to the discussion page and elaborate. If you can't find the discussion page elaborate here.
How does the focal length of the human eyeball change?
The "eyeball" doesn't have a focal length, any more than the body of a camera or the tube of a telescope have. It's the lenses (or mirrors) in the eye, camera, and telescope that have focal lengths. In the eye, the focal length of the lens changes when the shape of the lens changes ... becoming flatter or thicker in the center. That change is accomplished by muscles around the circular edge of the lens. They stretch the lens to flatten it, and relax to thicken it, when you shift your focus to longer or shorter distances.
What is focal length of a door peephole's lens and is it concave or convex?
The lens in a door peephole is a convex lens with a very short focal length, giving it a wide field of view. If it were on a camera, it would be called a "Fisheye lens".
