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01/30/2009 06:38:15 PM · #1 |
I'm wondering about the "conversion" of a film lens used on a digital camera instead of those lenses made specifically for digital cameras. I heard it's about a 1.5X difference. So, for example, if you use a 28-80mm lens that is not specifically made for digital cameras on a digital camera, the real zoom capability of this lens will be 42-120mm. 3 part question...
1)Is there any truth to this?
2)Why does this happen?
3)How do you know if a lens is made specifically for digital cameras?
p.s. If this is true, does anybody else find this annoying? |
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01/30/2009 06:40:57 PM · #2 |
1) Depends on the camera, some are 1.6x, some are 1.3x, some are what is called Full Frame and have no conversion
2) Because of the size of the sensor related to the size of a 35mm film
3) In the Canon system they are EF-S, I don't remember what they are in Nikon.
Message edited by author 2009-01-30 18:41:48. |
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01/30/2009 06:50:13 PM · #3 |
| In Nikon they are DX series lenses. Third party manufacturers also refer to them as "made for APS-C" sensors (I think). |
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01/30/2009 06:51:59 PM · #4 |
Originally posted by Covert_Oddity:
In Nikon they are DX series lenses. Third party manufacturers also refer to them as "made for APS-C" sensors (I think). |
You are correct, they are called APS-C.
//en.wikipedia.org/wiki/APS-C
Message edited by author 2009-01-30 18:52:11. |
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01/30/2009 06:57:27 PM · #5 |
1) There's a semi-truth to this. You are not actually increasing the optical zoom, but rather you get a cropped view of what the shot on a full-frame camera would look like. This means you get an increased zoom crop-factor, but it is not actually a TRUE zoom increase.
2) Oops, I kind of explained this in the first answer. It's because of crop-factor. You lose some of the image from the lens' image circle, on a cropped sensor camera, thus creating the illusion that you're getting more of a zoom. Think of it as cutting an inch from around a picture and then blowing up what you have left to fill the space you cut out.
3) Every manufacturer has a different designation to determine this. As pointed out, Nikon's is DX. |
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01/30/2009 06:57:40 PM · #6 |
1. have to lookitup but you can bet anything* a lens made before 2000(2002ish?)
was made for film
2. as mentioned but the lens is total independent of the sensor/film , 80mm is the same# optics as 4x5, 35mm, aps'ish
3. some mfg have designations ...
4.no / you get used to it
*don't bet the farm, aunty Em wouln't like it
# not all 80mm are equal but thats a diff topic
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01/30/2009 08:21:57 PM · #7 |
| Thanks all! That clears things up on something I've always been curious about. |
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