Tamron 24-70 newspaper test - Printable Version +- Opticallimits (https://forum.opticallimits.com) +-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4) +--- Forum: Just Talk (https://forum.opticallimits.com/forumdisplay.php?fid=17) +--- Thread: Tamron 24-70 newspaper test (/showthread.php?tid=2288) |
Tamron 24-70 newspaper test - Sotirius - 07-15-2012 Hi everybody, I purchased the new Tamron lens, for my Canon 5dm2. As I am no pro, or can I do any advanced test chart so I settled on the newspaper test chart and the simple centering chart. I struggled to keep everything as parallel/straight as possible. Shot with mirror lock up, self timer. Here is the RAW image of the newspaper test that seemed to me to be the best from the I made: http://www.mediafire.com/download.php?sli3l6a82g20mkk Here are some 100% crops of the image save with Digital photo professional in uncompressed Jpeg, with 5 sharpness(out of 10; Contrast :1, other parameters are default/0. http://www.flickr.com/photos/22285064@N03/sets/72157630580733610/ Here are some brick wall photos so you can see the distortions: http://www.flickr.com/photos/22285064@N03/sets/72157630553470686/ As I said, I don't know what to expect from this lens, so if anyone of you would be kind enough to give me your opinion I would be happy to hear it. If you think this lens copy is no good let me know so i return it(please explain why), or if you think the tests are not performed correctly, let me know so i redo them. Thank you. Tamron 24-70 newspaper test - Klaus - 07-15-2012 It looks generally fine to me (although the max sizes are a bit smallish). The unfocused chart image looks slightly irregular. The effect is also visible in the in-focus chart image where the lower edge transitions are marginally softer. However, such zoom lenses are never 100% perfect and in my book this would be a valid sample I think. Tamron 24-70 newspaper test - Sotirius - 07-15-2012 Thank you Klaus for your feedback. As I haven't owned a 24-70 lens before, I didn't know what to expect. Can you tell me how would the sample I have compare with the one you have tested, or with the 24-70 Canon ver.1? I did read the review, but i really don't know how to compare the results. If it was you would you been happy with this lens, or would you have asked for a replacement? Even with a better replacement if I do get one, would you know how much better it could be? If there wouldn't be a huge difference, I will settle with the one I already have. Tamron 24-70 newspaper test - Klaus - 07-15-2012 [quote name='Sotirius' timestamp='1342357362' post='19432'] Thank you Klaus for your feedback. As I haven't owned a 24-70 lens before, I didn't know what to expect. Can you tell me how would the sample I have compare with the one you have tested, or with the 24-70 Canon ver.1? I did read the review, but i really don't know how to compare the results. If it was you would you been happy with this lens, or would you have asked for a replacement? Even with a better replacement if I do get one, would you know how much better it could be? If there wouldn't be a huge difference, I will settle with the one I already have. [/quote] Sorry but it is next to impossible to give you an accurate assessment without a formal testing. As mentioned I'd probably call it a valid sample so the results shouldn't be far off from the lab test. From f/5.6 onward the difference should be marginal in any case. Tamron 24-70 newspaper test - frank - 07-17-2012 I wonder if in the test article of each lens the decentering test result should also be included. Then readers can get some feeling about how a decentering test image looks like for a normal (non-decentered) lens. Frank Tamron 24-70 newspaper test - Sotirius - 07-19-2012 [quote name='Frank' timestamp='1342533930' post='19448'] I wonder if in the test article of each lens the decentering test result should also be included. Then readers can get some feeling about how a decentering test image looks like for a normal (non-decentered) lens. Frank [/quote] That could be useful. Most of the newbies like me, don't know what to expect and how bad the diference is between slightly decentred and badly decentred. I sent the lens back to the camera store for a replacement and I will see if the replacement (on order)will perform any better. Hopefully it does. I will keep you updated. Tamron 24-70 newspaper test - Sotirius - 07-30-2012 I returned the lens back as the mediocre performance was not acceptable for the price range. In the future I would never buy a Tamron garbage lens again. I wonder how PZ rated it so high... If that Tamron was good, than all other lenses must be junk or I demand too much... I am happy that i returned it and I won't recommend Tamron to anyone. A few more things worth to mention about it, the flare is on a very high level, sharpness doesn't improve much when stopped down, and if you hate heavy vignetting -stay far away from it. Tamron 24-70 newspaper test - Brightcolours - 07-30-2012 Strange, your samples did not show "garbage" at all. I wonder what you would have said with a badly aligned Canon EF 24-70mm f2.8 L USM. Tamron 24-70 newspaper test - Sotirius - 08-08-2012 [quote name='Brightcolours' timestamp='1343637730' post='19642'] Strange, your samples did not show "garbage" at all. I wonder what you would have said with a badly aligned Canon EF 24-70mm f2.8 L USM. [/quote] Look at the corners, they are smudged! If I'd get a bad Canon lens it would be, trash? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' /> My 30 year old Zenit 55mm f/2 makes better images... Tamron 24-70 newspaper test - Brightcolours - 08-08-2012 [quote name='Sotirius' timestamp='1344397000' post='19726'] Look at the corners, they are smudged! If I'd get a bad Canon lens it would be, trash? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' /> My 30 year old Zenit 55mm f/2 makes better images... [/quote] I did not know your 55mm Zenit went to 24mm wide. Seriously, if you compare what 24mm on a standard zoom looks like to what a 55mm prime does..... A bit silly in my opinion. If you can't live with vignetting with wide angle, do not get full frame. And generally one does not photograph newspapers close by with 24mm. |