A 50mm is still a 50mm. What is means is, that changing the format from 24x36 to 16x24 (APS size) will result in an (narrower) angle of view, similar to that of a 75mm lens on a 35mm camera. Digital cameras of many formats are now so commonly used, that it doesn't make sense anymore to record the focal length used as equal to a 35mm format. If this is done, it should be clearly stated.
I find i confusing, however, that I have to look up the sensor size of the particalar camera used, to get an understanding of the optics used for a photograph. I don't understand why the photo industry does not shift to stating the angle of wiew in the recorded EXIF information instead of, or as a supplement to the focal length information. all the best Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Antonio [mailto:[EMAIL PROTECTED] Sendt: 15. august 2004 08:52 Til: [EMAIL PROTECTED] Emne: Re: Lessons fro a pro Still spinning it I see Willliam. Nobody has said that a 50mm lens is really a 75mm lens. Do you understand English? What they are saying is that a 50mm lens "becomes" a 70mm lens when placed on a digital camera. I.e. Its angle of view decreases to that of a 70mm lens. Here is a dictionary definition: \Be*come"\, v. i. 1. To pass from one state to another; to enter into some state or condition, by a change from another state, or by assuming or receiving new properties or qualities, additional matter, or a new character. Get it now? The AOV (its state) of a 50mm lens changes to that of a 70mm lens, when used with a smaller sensor (i.e when it receives new properties or qualities....). Shorthand, 50mm becomes 70mm. Other accepted English examples. 1. �100 pounds becomes 160 Euros. (again no actual change to the �100, don�t read it literally) 2. 50 degrees Celsius becomes xx degrees Fahrenheit. Antonio On 15/8/04 1:46 am, "William Robb" <[EMAIL PROTECTED]> wrote: > This is the webpage to learn from for all you guys who insist on > thinking your 50mm lens is really a 75mm lens. > > http://www.proshooter.homestead.com/untitled1.html > > William Robb > >
