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I recently bought the Rebel XSi that came with this 18-55mm lense. Since i'm still learning about what the camera can do, can someone help me out on fully understanding the limits of various lenses? If I'm taking a pic, and use the Aperture AV mode set to f8 or higher, how does that work when the lense says f/3.5-5-6? … see more I recently bought the Rebel XSi that came with this 18-55mm lense. Since i'm still learning about what the camera can do, can someone help me out on fully understanding the limits of various lenses? If I'm taking a pic, and use the Aperture AV mode set to f8 or higher, how does that work when the lense says f/3.5-5-6? Is it a setting that will not be a true f8+ since the lense is limited to f5.6? As i've experimented with the camera, it's been very hard getting tack sharp images, even on a tripod. I finally disabled the automatic sharpening options, but have not tested the results to see if shots are any sharper. Also, a reviewer of this lense here, said to turn off the IS if the camera is on a tripod. But they didn't say why to turn it off, so i'm left assuming it's for sharper images. Thanks for any info! see less I recently bought the Rebel XSi that came with this 18-55mm lense. Since i'm still learning about what the camera can do, can someone help me out on fully understanding the limits of various lenses? If I'm taking a pic, and use the Aperture AV mode set to f8 or higher, how does that work when the lense says f/3.5-5-6? Is it a setting that will not be a true f8+ since the lense is limited to f5.6? As i've experimented with the camera, it's been very hard getting tack sharp images, even on a tripod. I finally disabled the automatic sharpening options, but have not tested the results to see if shots are any sharper. Also, a reviewer of this lense here, said to turn off the IS if the camera is on a tripod. But they didn't say why to turn it off, so i'm left assuming it's for sharper images. Thanks for any info!

asked on March 27, 2009

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