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06/22/2009 05:27:39 PM · #1 |
I'm looking at new lenses and what not and I always see fx-x on it... I was wondering what exactly this means... I know what fstops on a camera refer to the aperture... what does it tell you when it is written on a lens?
Thanks, |
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06/22/2009 05:29:52 PM · #2 |
You'll see the pair of numbers on a zoom lens. Aperture is basically a ratio of the focal length to high wide the hole is. So when you are at the longer end of a zoom lens, the actual hole for the aperture isn't a different size but its relationship to the focal length is.
So in a nutshell, at longer zooms the amount of light that hits your sensor decreases.
Message edited by author 2009-06-22 17:30:21.
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06/22/2009 05:31:13 PM · #3 |
| It means it is a variable aperture lens. At the shorter zoom range it will be f4 and at the longer end f5.6 aka less light at the long end. |
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06/22/2009 05:34:25 PM · #4 |
| Thanks... makes sense now |
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06/22/2009 06:30:56 PM · #5 |
Originally posted by mac247ca:
Thanks... makes sense now |
still does not make complete sense.
Please try reading about them further on wiki or something. They are very important aspect of lense. Once you understand this, then think about spending money on lenses.
It might happen you buy lense now and later regret. So learn these first.
here is place to start with
//en.wikipedia.org/wiki/F-number
Message edited by author 2009-06-22 18:31:47. |
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