Hello! Newbie here!


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reistarz

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Oct 28, 2008
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#1
hi all, i'm new to the world of photography. hope to learn alot more in this forum... :D
My camera is Canon 400D with lens 18-55mm IS.
I have a question...my lens lowest f is 3.5. However, the lowest f i can get is 5.0. Why is it so? :sweat:
 

ahbian

Senior Member
May 23, 2006
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#2
Hi and welcome.

F stop 3.5 should refer to when the lens is at 18mm.
For 5.0, i believe your lens is at a different zoom setting?
 

Feb 16, 2008
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the blue planet
#3
hi..
warm welcome by a CS fan..
i don't know which shooting mode you are using but if you want to make your aperture 3.5, you shoud use 18mm zoom end :)
 

reistarz

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Oct 28, 2008
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#4
ooooh.....thanks for the replies guys!
now i get it! :cool:
does this means that for every lens, you only can get the lowest f at the shortest focal length?
 

Blur Shadow

Senior Member
Sep 17, 2005
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#5
ooooh.....thanks for the replies guys!
now i get it! :cool:
does this means that for every lens, you only can get the lowest f at the shortest focal length?
Yes, that is generally true for zoom lenses.

There are, of course, constant aperture lenses. For instance, a f/2.8 70-200 (A common Canon and Nikon lens) has a largest aperture of f/2.8 at every focal length.
 

reistarz

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Oct 28, 2008
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#6
Yes, that is generally true for zoom lenses.

There are, of course, constant aperture lenses. For instance, a f/2.8 70-200 (A common Canon and Nikon lens) has a largest aperture of f/2.8 at every focal length.
icic...now i know :) thanks!
 

catchlights

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Staff member
Sep 27, 2004
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Punggol, Singapore
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#7
ooooh.....thanks for the replies guys!
now i get it! :cool:
does this means that for every lens, you only can get the lowest f at the shortest focal length?
there are fixed aperture zoom lens or some call it constant aperture zoom lens, which the aperture value is same thru out all the different focal length.

yours is belong to the variable aperture zoom lens, the aperture value will change at different focal length.

btw, the fixed aperture zoom lens are much more expensive than variable aperture zoom lens.

Hope this help.
 

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reistarz

New Member
Oct 28, 2008
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#8
there are fixed aperture zoom lens or some call it constant aperture zoom lens, which the aperture value is same thru out all the different focal length.

yours is belong to the variable aperture zoom lens, the aperture value will change at different focal length.

btw, the fixed aperture zoom lens are much more expensive than variable aperture zoom lens.

Hope this help.
yes. it definitely helps! thanks alot! ;)
 

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