Comments on: Quick Tamron 24-70 MTF Data http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data Photo/video thoughts from the largest rental house Fri, 24 May 2013 15:01:05 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Oskar Ojala http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-13996 Oskar Ojala Tue, 17 Jul 2012 14:35:34 +0000 http://www.lensrentals.com/blog/?p=6583#comment-13996 I saw a review on lenstip.com; http://www.lenstip.com/340.4-Lens_review-Tamron_SP_24-70_mm_f_2.8_Di_VC_USD_Image_resolution.html, where it was claimed that at 45 mm there was a catastrophic drop of MTF. Might be worth to check it out. I saw a review on lenstip.com; http://www.lenstip.com/340.4-Lens_review-Tamron_SP_24-70_mm_f_2.8_Di_VC_USD_Image_resolution.html, where it was claimed that at 45 mm there was a catastrophic drop of MTF. Might be worth to check it out.

]]> By: Roger Cicala http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-13624 Roger Cicala Mon, 16 Jul 2012 01:03:27 +0000 http://www.lensrentals.com/blog/?p=6583#comment-13624 Hi Sotir, In looking at your images it appears they aren't perfectly square - it looks like the lens was tilted compared to the paper. I can't really tell anything of significance from them. Regards, Hi Sotir,

In looking at your images it appears they aren’t perfectly square – it looks like the lens was tilted compared to the paper. I can’t really tell anything of significance from them.

Regards,

]]> By: Sotir Popovski http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-13529 Sotir Popovski Sun, 15 Jul 2012 13:33:00 +0000 http://www.lensrentals.com/blog/?p=6583#comment-13529 Hi Roger, Thank you for testing this lens. As I live in Australia, I couldn't rent this lens and see how it performs on my 5d m2 so I decided to buy it instead. I don't have any previous experience with 24-70 lenses so I don't know what to expect from it. As you are a professional I would like your opinion if you have the time. I did two tests. One is the newspaper test, and the other is a quadrant test to check if the lens is centered. I have the newspaper test in RAW here: http://www.mediafire.com/download.php?sli3l6a82g20mkk (30MB size) Same image converted to JPEG with Canon's software. Sharpening +5 Contrast +1 the rest of the parameters are set to default. http://www.mediafire.com/view/?3sk3x3gbxf58gif (20MB size) If you are short on bandwidth, here are the crops and centering test: http://www.flickr.com/photos/22285064@N03/sets/72157630580733610/ I would highly regard your opinion, as I would like to know if I should keep this lens or return it...Or even send it back to Tamron to have it fixed. What is your say on this? Thank you in advance. Hi Roger,

Thank you for testing this lens. As I live in Australia, I couldn’t rent this lens and see how it performs on my 5d m2 so I decided to buy it instead. I don’t have any previous experience with 24-70 lenses so I don’t know what to expect from it. As you are a professional I would like your opinion if you have the time.
I did two tests. One is the newspaper test, and the other is a quadrant test to check if the lens is centered.
I have the newspaper test in RAW here: http://www.mediafire.com/download.php?sli3l6a82g20mkk (30MB size)
Same image converted to JPEG with Canon’s software. Sharpening +5 Contrast +1 the rest of the parameters are set to default.
http://www.mediafire.com/view/?3sk3x3gbxf58gif (20MB size)
If you are short on bandwidth, here are the crops and centering test:
http://www.flickr.com/photos/22285064@N03/sets/72157630580733610/
I would highly regard your opinion, as I would like to know if I should keep this lens or return it…Or even send it back to Tamron to have it fixed. What is your say on this? Thank you in advance.

]]> By: Roger Cicala http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-12150 Roger Cicala Sun, 08 Jul 2012 20:13:37 +0000 http://www.lensrentals.com/blog/?p=6583#comment-12150 Hi Jon, A lot of lenses are like that. Dust and debris are going to get into any lens, even the ones that are weather sealed eventually. I hadn't thought about whether it could fall down on your sensor. It certainly could, but I'm not certain it's much more likely to make your sensor dirty than any other lens. Like lenses, sensors are all going to get dirty eventually. Roger Hi Jon,

A lot of lenses are like that. Dust and debris are going to get into any lens, even the ones that are weather sealed eventually. I hadn’t thought about whether it could fall down on your sensor. It certainly could, but I’m not certain it’s much more likely to make your sensor dirty than any other lens. Like lenses, sensors are all going to get dirty eventually.

Roger

]]> By: Jon http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-12119 Jon Sun, 08 Jul 2012 17:05:04 +0000 http://www.lensrentals.com/blog/?p=6583#comment-12119 I just received my copy of the Nikon version, seems fairly similar to the Nikon 24-70 but a little wider with more barrel distortion at 24 and slightly more vignetting. Very sharp with and without VC. It definitely helps video stability. Stills at 1/20 are way sharper with VC. My question/issue is that I noticed that when zoomed to 70 with the barrel extended, if you look at the end that attaches to the camera, a lot of circuitry is exposed around the optics. Could any dust, debris, etc. fall out of this area and into the sensor of my new D4 during heavy use? All my Nikon lenses are sealed where they attach to the camera. I read your article on evaluating new lenses which is what got me to take a critical look at it. Is this a design issue worth worrying about? Thanks. I just received my copy of the Nikon version, seems fairly similar to the Nikon 24-70 but a little wider with more barrel distortion at 24 and slightly more vignetting. Very sharp with and without VC. It definitely helps video stability. Stills at 1/20 are way sharper with VC.
My question/issue is that I noticed that when zoomed to 70 with the barrel extended, if you look at the end that attaches to the camera, a lot of circuitry is exposed around the optics. Could any dust, debris, etc. fall out of this area and into the sensor of my new D4 during heavy use? All my Nikon lenses are sealed where they attach to the camera. I read your article on evaluating new lenses which is what got me to take a critical look at it. Is this a design issue worth worrying about? Thanks.

]]> By: Larry http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-7844 Larry Thu, 03 May 2012 23:44:41 +0000 http://www.lensrentals.com/blog/?p=6583#comment-7844 Roger, thanks for the quick feedback. I figured a TC would not be a good idea. As for the step-down ring, I've been pleasantly surprised sometimes. For instance, I routinely use a 67-58mm SD ring on the Canon 100L macro with a 1.6x crop camera. More amazingly, I took a chance that the Sigma 30mm/1.4 had to be designed to cover Nikon's 1.5x image circle -- it turns out it takes a 62-58mm SD ring just fine on a Canon 1.6x crop. Of course, the wider you go, the more risky it is. Thanks again, Larry. Roger, thanks for the quick feedback. I figured a TC would not be a good idea. As for the step-down ring, I’ve been pleasantly surprised sometimes. For instance, I routinely use a 67-58mm SD ring on the Canon 100L macro with a 1.6x crop camera. More amazingly, I took a chance that the Sigma 30mm/1.4 had to be designed to cover Nikon’s 1.5x image circle — it turns out it takes a 62-58mm SD ring just fine on a Canon 1.6x crop. Of course, the wider you go, the more risky it is. Thanks again, Larry.

]]> By: DJ Monopoli http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-7488 DJ Monopoli Wed, 02 May 2012 01:19:30 +0000 http://www.lensrentals.com/blog/?p=6583#comment-7488 Here is a quick review and test video footage with the lens: http://www.youtube.com/watch?v=1znNnOINzeM Here is a quick review and test video footage with the lens:
http://www.youtube.com/watch?v=1znNnOINzeM

]]> By: George http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-7481 George Tue, 01 May 2012 22:31:00 +0000 http://www.lensrentals.com/blog/?p=6583#comment-7481 While the 24-70 VC seems to be an optically decent lens, I will not buy another lens from Tamron, Sigma or Tokina, until these guys finally get Zoom- and Focus-rings turning the right way round for Canon. It is absolutely ridiculous they got away with this evil practice for so long. Canon-users deserve to be taken as serious as Nikon/Sony users. All that is required is one different cog-wheel in the gear box for focus and zoom-ring. So get to work, Tamron! While the 24-70 VC seems to be an optically decent lens, I will not buy another lens from Tamron, Sigma or Tokina, until these guys finally get Zoom- and Focus-rings turning the right way round for Canon.

It is absolutely ridiculous they got away with this evil practice for so long. Canon-users deserve to be taken as serious as Nikon/Sony users. All that is required is one different cog-wheel in the gear box for focus and zoom-ring. So get to work, Tamron!

]]> By: Ralph Conway http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-7479 Ralph Conway Tue, 01 May 2012 21:56:20 +0000 http://www.lensrentals.com/blog/?p=6583#comment-7479 Thank you, Roger. That gives me some hope to have a chance to get a 24-70 WITH IS at the end. Ralph Thank you, Roger. That gives me some hope to have a chance to get a 24-70 WITH IS at the end.

Ralph

]]> By: Eric http://www.lensrentals.com/blog/2012/04/quick-tamron-24-70-mtf-data/comment-page-1#comment-7459 Eric Tue, 01 May 2012 15:33:13 +0000 http://www.lensrentals.com/blog/?p=6583#comment-7459 There is also a nice review at ephotozine. com- using the same Canon 5Dmk2. I have already preordered my copy for Nikon D4. Im eagerly waiting for mid june to get my lens. I guess Tamron will be on par with the Nikon 24-70mm 2,8 plus having vibration compensation. I had earlier the Tamron 28-75 f2,8 in D700 and it gave good results,but it seems that the new one is really better. There is also a nice review at ephotozine. com- using the same Canon 5Dmk2.
I have already preordered my copy for Nikon D4.
Im eagerly waiting for mid june to get my lens.
I guess Tamron will be on par with the Nikon 24-70mm 2,8 plus having vibration compensation.
I had earlier the Tamron 28-75 f2,8 in D700 and it gave good results,but it seems that the new one is really better.

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