Davoxt Member  124 posts Likes: 4 Joined Sep 2005 Location: Pilbara West Aussie More info | Dec 11, 2005 19:11 | #1 I took these two photo's just to see if one lens is sharper then the other, both where cropped at 100%.  HOSTED PHOTO please log in to view hosted photos in full size.  HOSTED PHOTO please log in to view hosted photos in full size. Gone to Dark Side
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tim Light Bringer  51,010 posts Likes: 375 Joined Nov 2004 Location: Wellington, New Zealand More info | Dec 11, 2005 19:17 | #2 I would expect the prime to be sharper, especially because macro lenses are always dead sharp - I have the 100mm. Unless you're looking at a close crop you should have a hard time telling them apart. Professional wedding photographer, solution architect and general technical guy with multiple Amazon Web Services certifications.
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gasrocks Cream of the Crop  13,432 posts Likes: 2 Joined Mar 2005 Location: Portage, Wisconsin USA More info | Ok, but...... not much of a pix to judge by. How about something else? GEAR LIST
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Dec 12, 2005 01:31 | #4 Two more taken 350m from building then cropped again at 100%, 100mm first.  HOSTED PHOTO please log in to view hosted photos in full size.  HOSTED PHOTO please log in to view hosted photos in full size. Gone to Dark Side
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xmetal2001 Member 56 posts Joined Jun 2005 Location: Atlanta, Georgia More info | Looks like in the 2nd pic of the ones you just posted the building is out of focus. The focus seems to be on the branches in the lower left.
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pault107 Member 138 posts Joined Nov 2005 More info | Dec 12, 2005 03:45 | #6 Hmm, strange thread
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nitsch Goldmember 2,393 posts Likes: 2 Joined Feb 2005 More info | Dec 12, 2005 04:31 | #7 The sprinkler shot is hard to judge because a) the lenses are different focal lengths you should have moved so the subject remained the same size in each shot and b) you have miss focused the second shot, if you look at the grass it looks like it is focused behind the sprinkler. The second set of shots suffer from the same problems. The test is fairly pointless, the 100mm f2.8 is one of the sharpest primes on the market and you are comparing it to a consumer level zoom, get out there and take some creative shots! I bet you've got some cracking scenery/wildlife out there.
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tim Light Bringer 51,010 posts Likes: 375 Joined Nov 2004 Location: Wellington, New Zealand More info | xmetal2001 wrote: Looks like in the 2nd pic of the ones you just posted the building is out of focus. The focus seems to be on the branches in the lower left. Good call. The pictures are meaningless because of that. Professional wedding photographer, solution architect and general technical guy with multiple Amazon Web Services certifications.
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Jakpro Senior Member  320 posts Joined Sep 2005 Location: AZ, U.S.A More info | Dec 12, 2005 07:35 | #9 I think that the second set of photos brings up a good point on the problems assocaited with auto focus.
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nitsch Goldmember 2,393 posts Likes: 2 Joined Feb 2005 More info | Jakpro wrote: I think that the second set of photos brings up a good point on the problems assocaited with auto focus. If you are not paying attentioon to the focus points, something small in thew foreground can really "trick" the auto focus. If you were manually focusing, this would probably not be a problem. Or just using the centre point for AF would get around this too.
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nitsch Goldmember 2,393 posts Likes: 2 Joined Feb 2005 More info | nitsch wrote: The sprinkler shot is hard to judge because a) the lenses are different focal lengths you should have moved so the subject remained the same size in each shot and b) you have miss focused the second shot, if you look at the grass it looks like it is focused behind the sprinkler. The second set of shots suffer from the same problems. The test is fairly pointless, the 100mm f2.8 is one of the sharpest primes on the market and you are comparing it to a consumer level zoom, get out there and take some creative shots! I bet you've got some cracking scenery/wildlife out there.  Further to this post, another thing you may want to do for future lens comparisons is keep the aperture the same on both lenses for the shots you are comparing.
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cc10d Senior Member  812 posts Likes: 1 Joined Jan 2004 Location: Oregon, USA More info | Dec 12, 2005 10:14 | #12 RIGHT ! cc
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