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PostPosted: Sun Jul 20, 2008 9:01 pm 
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Joined: Sun Jul 20, 2008 8:25 pm
Posts: 2
hey folks!
newbie to the community so i send a warm hello :)

so i bought (today actually) a rebel xt (eos 350d), and im enjoying it thus far!
anyhow- call me dumb but im a bit confused when it comes to setting the f/number.

i was following a tutorial(how to blur your background)and when the video was showing the f/number you could actually see the letter f. on mine - im not seeing it.

i go to av, and when i use the black "scroll" wheel at the top i can get as low as a 5.0 to and as high as 30-something.
is this the f-number?


please, someone knock some sense into me.
:)


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PostPosted: Sun Jul 20, 2008 9:11 pm 
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Joined: Tue Jun 10, 2008 6:07 am
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Location: US
Yes.

The f/number is your aperture.

It ranges from as big as 1.2 - 32.

You will most likely see numbers like 3.5, 4, 5.6, and etc.

So yes. You are seeing the f/number.

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PostPosted: Sun Jul 20, 2008 9:14 pm 
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Joined: Sun Jul 20, 2008 8:25 pm
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thanks!


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PostPosted: Mon Aug 04, 2008 3:17 pm 
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Joined: Sat Aug 02, 2008 10:30 am
Posts: 11
kinda what i also wanna know is On a 18-55mm lens F/3.5-5.6 = can u still go below like 1.2 F and above like say 32 F on those lenses tough it describes as 3.5-5.6F?


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PostPosted: Mon Aug 04, 2008 3:38 pm 
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Joined: Thu Sep 13, 2007 6:31 pm
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Location: London, UK
Fouracesswe wrote:
kinda what i also wanna know is On a 18-55mm lens F/3.5-5.6 = can u still go below like 1.2 F and above like say 32 F on those lenses tough it describes as 3.5-5.6F?


No. The F/3.5-5.6 is the maximum aperture for that lens. The maximum aperture gets smaller as you zoom in (3.5 at 18mm until you get to 55mm when the max is 5.6.) If you wanted an f/1.2 aperture you'd need to have your finances with a cherry on top :D. At the other end of the aperture scale (the larger numbers which mean smaller apertures) most lenses will let you close the aperture to f/22 of f/32. However, this is not something to worry about too much as it is usually a bad idea to use a small aperture as the image can lose sharpness - (Have a look at Cambridge in Colour's page about diffraction if you want more info on that.)

So I hope that clears it up. :) Any other questions, feel free to ask. 8)

Mark

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