learncanon Member 177 posts Likes: 4 Joined Jul 2010 More info | Apr 30, 2011 23:47 | #1 As above. I know everybody want to suck every last photon of light in Milky Way Photography. But one characteristic of all lens is that stopping down just a bit can make image sharper. I wonder is it worth it to stop down to like F3.5 losing a bit of light for sharpness?
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Jeff Goldmember  1,462 posts Likes: 28 Joined Nov 2007 Location: 42° 34' N 87° 55' W Kenosha, WI More info | May 03, 2011 11:28 | #2 Not to be flip, but try both! Its only 15 seconds. Zoom in and check the image quality and adjust from there. If you're at 17mm you might even be able to get a little more time before trailing is evident. Jeff
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