How can I learn to read what is written on the edge of the lenses of digital cameras??
The following info should be on all lenses: • Focal length, or focal length range- will read as follows 28mm-200mm, or 18mm-55mm, or 85mm, or something similar. This number is arrived at by use of a formula that involves the distance from the film plane (or sensor) to the optical center of the lens….what it means to us is to give an indication of the angle of view covered by this lens- wether wide angle, normal, or telephoto, or a zoom range. • The largest f- stop of the lens. these will read as one number like f/2.8, f-2.8, 1/2.8…or in the case of most consumer zoom lenses a range of say f/3.5-5.6. Again there is some math involved involving a ratio of the diameter to the focal length, but it measures the light gathering ability of the lens. The lower the number, the more light the lens can let in- so the more expensive ( & heavy to carry) it is. • The filter thread zize will be indicated with something like (theta, or zero with a slash)- 52mm, or 72mm, or 77mm(rally big) • The le
