Xinca Posted August 9, 2005 Share Posted August 9, 2005 Just a simple test. Hopfully it is useful for someone. Both at 24 ,F4,1/850s. The 17-40/F4 is mounted on 10D and the 18-55 is mounted on the rebel xt. I use M mode and shoot RAW format. The photo is 100% crop with out any adjustment except the photo come out from rebel xt is resize to the same size as the other one. For me the result is clear: The EF 17-40 is worth it's price! Link to comment Share on other sites More sharing options...
Xinca Posted August 9, 2005 Author Share Posted August 9, 2005 The comparation is in the attachment. And the left is EF 17-40/F4. Link to comment Share on other sites More sharing options...
shambrick007 Posted August 9, 2005 Share Posted August 9, 2005 "...except the photo come out from rebel xt is resize to the same size as the other one."<p> Don't doubt your results, but the above would affect them. Why did you not shoot both lenses/shots on the XT? Link to comment Share on other sites More sharing options...
jan_jarczyk Posted August 9, 2005 Share Posted August 9, 2005 you've prove that rebel xt is a worse camera :) cool! Link to comment Share on other sites More sharing options...
peufeu Posted August 9, 2005 Share Posted August 9, 2005 Yikes ! Nice bokeh.. uh wait, no. Link to comment Share on other sites More sharing options...
gediminas_p Posted August 9, 2005 Share Posted August 9, 2005 Well, Alex, thanks for your effort but I think a proper comparison should be done with the same camera used for both lenses, and at several different aperture values, not just wide-open. The cheapy 18-55 will clearly be outperformed at F4, but I doubt if the difference is that noticeable at F8, for example. Another point to consider is that the L is 10 times more expensive than the kit lens - personally I'd expect more of a quality improvement from the pricier lens. Link to comment Share on other sites More sharing options...
Xinca Posted August 9, 2005 Author Share Posted August 9, 2005 Gediminas P: If someone always want to use the lens at F8 I really do not think he need any good lens. I want to the F4 with 17-40/F4 because I need it. I got the EF 17-40/F4 with 600US$ and the 18-55 maybe worth 100US$ so it is only 6 times expensive. My point is if someone want to buy the EOS rebel XT or 20D maybe he should buy the body only and add 500$ to buy the EF 17-40. Sheldon Hambrick: For my understanding if I make a big photo smaller the photo should be better. Mabybe I was worng. Anyway I try test the both lens on rebel xt again later and post the result. Tks. Link to comment Share on other sites More sharing options...
damian_tinsley Posted August 9, 2005 Share Posted August 9, 2005 Guys, please remember that the 17-40 is: a) going to last you as long as you have the canon DSLR system (note it's not EF-S, but full frame - I have blast with it on a film SLR if I really want the wide angle shot. Can't wait for a reasonable FF DSLR though) b) it's a joy to use. Feels good. My 18-55 was OK, but this 17-40 isismply a muc nicer lens to have. All the best DAmian Link to comment Share on other sites More sharing options...
athinkle Posted August 9, 2005 Share Posted August 9, 2005 I always appreciate hard results from people who take time to run solid comparison tests. But hey, this is kind of a Hyundai to Jaguar comparison here, so why spend the time? Link to comment Share on other sites More sharing options...
shambrick007 Posted August 9, 2005 Share Posted August 9, 2005 "For my understanding if I make a big photo smaller the photo should be better." <p> No, not really. The defects are just not as noticeable. Bigger or smaller, you're digitally re-sampling the data, and changing the image. Link to comment Share on other sites More sharing options...
ron c sunshine coast,qld,a Posted August 9, 2005 Share Posted August 9, 2005 Regardless wether this is an 'irellevant' test to some it would still be a*VERY* usefull test for others. Many potential buyers would be interested in HOW MUCH BETTER the 17-40 was (and therefore is it worth the extra $). <P>Nice work Alex but i'm afraid the resizing thing really is a huge problem -bad enough to completely invalidate the results.Only pure 100% crops will do.ANY resizing -either up or down- absolutally massacres sharpness. <P>Also if the 18-55 pic was taken on a film camera then the results are null and void anyway.Not because of differences between film and digital (allthough they are a strong factor) but simply because the film has to be scanned...and scanning is generally a very dodgy proposition when compared to digital capture. <P>Thanks for the effort though! :) <BR>Any chance you could do the test again using both lenses on the 10D? Link to comment Share on other sites More sharing options...
Xinca Posted August 9, 2005 Author Share Posted August 9, 2005 WIll do it again but only on the rebel xt - because the EFS lens can not be mount to 10D. The reason I did this test is actually I want to know how much better the L compare to the the most cheap lens. So I can know when I should use the cheap one and when I should use the L. You know sometime it is now worth to use the L. Maybe the next test will be in this weekend because I also want to test the color. I have to find some place which I can test the detail and color. Link to comment Share on other sites More sharing options...
shambrick007 Posted August 9, 2005 Share Posted August 9, 2005 From your results, even considering the re-sampling - I'd never use the cheap one :-) Link to comment Share on other sites More sharing options...
daniele_g Posted August 15, 2005 Share Posted August 15, 2005 Hy Alex, what about comparing this EF 17-40 with the EF-S 17-85 IS USM ? I think here the competition it's a bit interesting and more balanced... Any comment will be appreciated... Thanks Link to comment Share on other sites More sharing options...
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