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 Post subject: ap setting
PostPosted: Fri May 06, 2011 10:31 am 
when i set a low aperture when i go to take the shot the aperture i set changes to a higher number canon lens canon camera EOS rebel 550D
what is the reason for this


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 Post subject:
PostPosted: Fri May 06, 2011 10:35 am 
That's because you have a variable aperture lens. (example F/3.5-F/5.6) So it will change aperture according to the focal range. Fixed aperture lenses (like a Tamron 17-50mm F/2.8 ) will mentain F/2.8 in AP troughout it's focal range.


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 Post subject:
PostPosted: Sat May 07, 2011 10:57 am 
In other words, if you zoom with that lens. The biggest aperture wil become smaller.


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 Post subject:
PostPosted: Tue May 10, 2011 7:32 am 
Thanks very much very useful


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 Post subject:
PostPosted: Tue May 10, 2011 9:22 am 
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Joined: Thu Oct 08, 2009 11:24 am
Posts: 1822
unless it's the macro lens you're using....

Then your aperture will change when you close focus...


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 Post subject:
PostPosted: Tue May 10, 2011 3:55 pm 
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Joined: Tue Jul 13, 2010 8:47 pm
Posts: 202
Location: Osijek
not on all lenses though ;) only with the ones you that don't extend when focusing... (but that is unimportant)

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 Post subject:
PostPosted: Tue May 10, 2011 8:15 pm 
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Joined: Thu Oct 08, 2009 11:24 am
Posts: 1822
or macros :wink:


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 Post subject:
PostPosted: Wed May 11, 2011 11:00 am 
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Joined: Tue Jul 13, 2010 8:47 pm
Posts: 202
Location: Osijek
phil i was referring to your post when you said that macro lenses change aperture when focusing. this is the case with nikon/canon lenses that do not extend during focusing. in other hand tamron or sigma macros extend to almost double the lenght of the lens while having a fixed aperture.. (should be like that at least)

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