On my 40D, in Av mode, The largest aperture I can get is 5.6, regardless of iso. I sometimes want 3.5. What am I missing?
Thanks
trailguy Senior Member  More info | Mar 16, 2009 18:08 | #1 On my 40D, in Av mode, The largest aperture I can get is 5.6, regardless of iso. I sometimes want 3.5. What am I missing?
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Tumeg Goldmember  1,823 posts Joined Nov 2007 Location: Orange County, California More info | Mar 16, 2009 18:08 | #2 Your lens may only go up to 5.6. | Canon 5D Mk II | Canon 17-40MM F/4L | Canon 50MM F/1.4 | Canon 85MM F/1.8 | Canon 580EX II |
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picturecrazy soft-hearted weenie-boy  8,565 posts Likes: 780 Joined Jan 2006 Location: Alberta, CANADA More info | Mar 16, 2009 18:09 | #3 What lens are you using? If you are zoomed in to it's longest setting... 5.6 might be the widest aperture it can use. -Lloyd
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xarqi Cream of the Crop  10,435 posts Likes: 2 Joined Oct 2005 Location: Aotearoa/New Zealand More info | Mar 16, 2009 18:14 | #4 trailguy wrote in post #7536861  On my 40D, in Av mode, The largest aperture I can get is 5.6, regardless of iso. I sometimes want 3.5. What am I missing? Thanks A suitable lens.
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danj Goldmember  1,575 posts Joined Nov 2008 Location: Florida More info | Mar 16, 2009 18:31 | #5 A lens that says 3.5 - 5.6 (or whatever) means that its aperture varies depending on the amount of zoom. If you're zoomed out, you'll have the lower number and it goes up as you zoom. Constant aperture lenses, ones that say f/2.8 without a dash and second number, constantly offer the same max aperture.
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Mar 16, 2009 19:49 | #6 THAT must be what I had done (zoom position), for I just now turned it on, and it went right to 3.5.
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xarqi Cream of the Crop 10,435 posts Likes: 2 Joined Oct 2005 Location: Aotearoa/New Zealand More info | Mar 16, 2009 21:04 | #7 Ummm - there's an 18-135 Nikon lens, but that's f/3.5-5.6. That'd be consistent with it hitting f/3.5 on the wide end, but it sure isn't a Canon kit lens.
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Deepsiix Member 30 posts Joined Jan 2009 Location: Winnipeg More info | Mar 16, 2009 21:07 | #8 trailguy wrote in post #7537526 THAT must be what I had done (zoom position), for I just now turned it on, and it went right to 3.5. Lens is 18 - 135 f/2.8-5.6 'kit' lens'; It will do for me until I'm more sure of what I need/want in a good one lens. Should have specified lens in previous message. While I'm here, could someone give an opinion on whether I would see a difference in image quality between this lens and a 'good' one, when shooting runners in daylight? Thanks yes, a good lens has very noticeable image quality over a kit lens.
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Huskers69 Senior Member  699 posts Likes: 2 Joined Jan 2009 More info | Mar 16, 2009 22:56 | #9 Is there such a lens as that?? Or is it the 28-135 kit lens?
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xarqi Cream of the Crop 10,435 posts Likes: 2 Joined Oct 2005 Location: Aotearoa/New Zealand More info | Mar 17, 2009 01:47 | #10 Huskers69 wrote in post #7538812 Is there such a lens as that?? Or is it the 28-135 kit lens? Yeah - that's almost certainly it. How did I miss that possibility?
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Mar 17, 2009 13:04 | #11 28 -135 of course. I was a bit confused then, and about to be po'd when I thought my camera wouldn't go to f/3.5.
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