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06/28/2005 03:02:34 PM · #1 |
Hi, I don't know much about interchangable lenses, but I was wondering how zoom works on them. For example, the camera I have right now just has a fixed lens, but has 10x zoom.
Take for example this lens:
Canon EF-S 18-55mm f/3.5-5.6
How can you tell how much it will zoom in? |
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06/28/2005 03:05:00 PM · #2 |
divide the long mm by the short mm
ex
55/18= 3.05x |
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06/28/2005 03:06:01 PM · #3 |
55 divided by 18 is roughly 3, so it's a 3x zoom lens.
You lens isn't fixed, or it wouldn't zoom at all. I think you mean your lens is not removable ... meaning you can't buy different lenses for it like most SLR's. |
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06/28/2005 03:09:36 PM · #4 |
Originally posted by hopper:
55 divided by 18 is roughly 3, so it's a 3x zoom lens.
You lens isn't fixed, or it wouldn't zoom at all. I think you mean your lens is not removable ... meaning you can't buy different lenses for it like most SLR's. |
Thanks for correcting my terminology :) I have so much to learn. And thanks for answering my question superdave and hopper! |
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06/28/2005 03:20:43 PM · #5 |
| and for your info, the best focal range for a zoom to be sharp is <3.0 when you exeed 3.0 the lens starts becomming soft throughtout the range. |
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