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/[email protected]/
Here are some brick wall photos so you can see the distortions:
http://www.flickr.com/photos/[email protected]/
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.
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.
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 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.
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 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.
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.
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 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...
[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.