? regarding aperatures on different lenses

Started Apr 6, 2010 | Discussions thread
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red04svtcobra
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? regarding aperatures on different lenses
Apr 6, 2010

I tried searching for my answer but couldn't find anything as I really don't know how to ask it. But here is my shot at it. If I have 2 glasses one a 70-200 f/2.8 and the other a 70-300 f3.4-5.6 will I get the same light in at say f/5. What if I change the focal length will it affect it then?? The reason I ask this is I had a hard time when I had my 70-300 to shoot at 1/1000 at even f/4.5 without having to jack the ISO up. Now with my 70-200 it seems I can shoot upwards of 1/1250 with no problem. Is it just me or is it possible?? Thanks in advance.
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http://www.chrishullphotography.com
Nikon D80
Kit lens 18-135mm
50mm 1.8
70-200 f2.8 VRI
Manfrotto tripod
lowepro backpack

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