Timeline for How is zoom measured?
Current License: CC BY-SA 3.0
4 events
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| May 21, 2013 at 11:30 | comment | added | mattdm | A longer focal length can never be the same as being closer to an object, because you can't change perspective by doing anything other than moving. (Or, by taking a 3D image and re-rendering, but we'll leave that aside for a decade or so.) The focal length of a lens can be used to determine how much of the picture a distant object will fill, though. See the existing answers linked above, and particularly photo.stackexchange.com/questions/13717/… | |
| May 21, 2013 at 10:16 | comment | added | DetlevCM | A long focal length will make things "far away" seem closer. However you cannot related that to "zoom" which is just a ratio of focal lengths. (Property of the lens you are using) You could define 50mm as you "baseline" and then user zoom as a relative term to 50mm, BUT you would need to state what you use as your baseline. What do you want to achieve? (PS: I suggest you avoid the term zoom and *x magnification - they cause more problems than they solve.) | |
| May 21, 2013 at 9:29 | comment | added | just.another.programmer | Does focal length affect the perceived distance to an object? If I found the longest focal length, could I use it to calculate perceived "zoom"? | |
| May 21, 2013 at 9:25 | history | answered | DetlevCM | CC BY-SA 3.0 |