Question on Sony A100 lense


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SoulXion

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Apr 17, 2008
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#1
Hi I'm a newbie here

I got a question for this Sony A100 lense.
I borrow this cam from my friend and use it to take some shot.
The lense stated that the zoom is 18-70 mm which at first I thought "WOW":bigeyes:,
the angle is so wide, so can definitely take some very good landscape photos.
but later I found that it's not much wider than a 28mm wide-angle camera;p
Is it because there is some setting that I didn't use or it's just sony standard is different from others?:think:
 

Galdor

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Jul 5, 2006
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#3
Well, most DSLRs have a 1.5 crop as compared to a 35mm film camera, so a 18-70mm on a DSLR is actually equivalent to a 27mm-105mm range when compared to the film. Hence, there is not much difference when you compared it to your 28mm camera.
 

SoulXion

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Apr 17, 2008
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#4
Thks man for the quick reply (less than 1 minute some more :thumbsup: )

Will look up more info on this aps-c camera :D
 

sytan81

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Mar 13, 2008
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#5
the A100 is not a full frame camera as are SLRs. it's FOV is cropped by 1.5x. this effectively means that 18mm on a non-full-frame DSLR is the equivalent of 27mm on a full-frame DSLR. this explains your observations.

most APS-sized DSLRs have their FOVs cropped by 1.5x or 1.6x. as their sensors are smaller, they capture a smaller portion of the FOV, but magnifies it to the specified resolution.
 

SoulXion

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#6
How do I know the difference if I see a aps-c type lense & a normal 35mm type lense as I can see that difference brand use difference standard.:think:
 

Galdor

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#7
If you are referring to Sony/KM, a lens meant for APS-C cameras will be marked with DT. Otherwise, the others will be for Full Frame as well. You can actually use lenses for a FF camera on an APS-C sensor just that the lens will not be as wide.
 

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