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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 06 Feb 2012 (Monday) 06:37
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Tamron 24-70 f/2.8 Di VC USD Announced!!! Stabilized 24-70!

 
Charlie
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May 02, 2012 19:15 |  #1291

bkdc wrote in post #14369102 (external link)
I believe it has to do with the manufacturing process of the aspherical elements. Cheaper production processes tend to cause onion bokeh. Expensive ground aspherical elements tend not to onion. I wonder how much money Tamron saves on each lens through their methods.

not sure about this post.

on one hand, the tamron does seem sharper than the canon L mk1, on the other, onion bokeh might pop up when you least expect it. Maybe with the sharpness comes the onion? I dont know, just throwing stuff around.


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DarthMTS47
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May 02, 2012 19:40 |  #1292

Anyone else have a bad copy that's front-focusing? Mine's so bad that it's outside what I can microadjust for... Guess it's going back. <sigh>

-Mike




  
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davidc502
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May 02, 2012 19:54 |  #1293

DarthMTS47 wrote in post #14369430 (external link)
Anyone else have a bad copy that's front-focusing? Mine's so bad that it's outside what I can microadjust for... Guess it's going back. <sigh>

-Mike

Share some focus chart results or battery tests please. Would really like to see how front focused it is.


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Jmantyger
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May 02, 2012 20:33 |  #1294

DarthMTS47 wrote in post #14369430 (external link)
Anyone else have a bad copy that's front-focusing? Mine's so bad that it's outside what I can microadjust for... Guess it's going back. <sigh>

-Mike

Mine front focused badly & is going back as well. Severe front focusing on 5D MKII & 7D. Could not micro-adjust enough.


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DarthMTS47
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May 02, 2012 20:45 |  #1295

davidc502 wrote in post #14369513 (external link)
Share some focus chart results or battery tests please. Would really like to see how front focused it is.

Here's a crop of 70mm @ f/2.8 with a +20 microadjustment. It's pretty close (the best of the group I shot), but still front-focusing.

IMAGE: http://cmphoto.zenfolio.com/img/s3/v45/p1041853658-5.jpg

It seems like a nice lens - it was smaller than I thought it would be and the VC works extremely well - but the focus was pretty erratic on my copy at least...

-Mike



  
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K6AZ
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May 02, 2012 20:50 |  #1296

davidc502 wrote in post #14369513 (external link)
Share some focus chart results or battery tests please. Would really like to see how front focused it is.

Prescription bottles work well for this too. ;)

I was fine with everything up to the front focusing complaints. Hope this isn't a significant percentage of the copies delivered so far.


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mike ­ cabilangan
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May 02, 2012 21:00 |  #1297

K6AZ wrote in post #14369861 (external link)
Prescription bottles work well for this too. ;)

I was fine with everything up to the front focusing complaints. Hope this isn't a significant percentage of the copies delivered so far.

yup. onions and vignettes couldn't stop me ... but focus issues froze me in my tracks.


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arentol
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May 02, 2012 21:04 |  #1298

No focus issues here, at least no discernible ones from the shots I have taken so far. I may FoCal it tonight and see what I get, but I am not too worried.


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Jmantyger
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May 02, 2012 21:16 |  #1299

davidc502 wrote in post #14369513 (external link)
Share some focus chart results or battery tests please. Would really like to see how front focused it is.

I deleted the pics after I decided to send it back.

Could tell it was front focusing from the pics I had taken. Broke out the alignment chart, first shot front focused so badly that the focus centered between 20mm & 30mm on the chart.

Maxed out micro adjust moved the center of the lens focus closer, but it still wasn't centered on the "This text should be perfectly in focus" print.

Sending it back. Will try again.


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davidc502
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May 02, 2012 21:33 |  #1300

DarthMTS47 wrote in post #14369834 (external link)
Here's a crop of 70mm @ f/2.8 with a +20 microadjustment. It's pretty close (the best of the group I shot), but still front-focusing.

QUOTED IMAGE

It seems like a nice lens - it was smaller than I thought it would be and the VC works extremely well - but the focus was pretty erratic on my copy at least...

-Mike

I have a front focusing 50mm f/1.4, and I can micro adjust +20 to level it out on the chart test, but then it doesn't focus properly at mid ranges or long ranges. When I adjusted to +10 the focus chart shows a little front focusing but mid and long ranges are now perfect. Since I'm not worried about minimum focus distance, a +10 was a perfect compomise.

You might try some tests at 5 feet and then 15 to 20 to see if those distances are still focusing properly after setting a +20.


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Jmantyger
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May 02, 2012 22:18 |  #1301

davidc502 wrote in post #14370086 (external link)
I have a front focusing 50mm f/1.4, and I can micro adjust +20 to level it out on the chart test, but then it doesn't focus properly at mid ranges or long ranges. When I adjusted to +10 the focus chart shows a little front focusing but mid and long ranges are now perfect. Since I'm not worried about minimum focus distance, a +10 was a perfect compomise.

You might try some tests at 5 feet and then 15 to 20 to see if those distances are still focusing properly after setting a +20.

Can't speak for Mike, but mine front focused at all of the focal lengths I tried at several distances-3 feet, 6 feet & about 20 feet. +5, +10, +15 or +20.


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DarthMTS47
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May 02, 2012 22:37 |  #1302

Jmantyger wrote in post #14370329 (external link)
Can't speak for Mike, but mine front focused at all of the focal lengths I tried at several distances-3 feet, 6 feet & about 20 feet. +5, +10, +15 or +20.

Yep. Mine front-focused at all distances I tried, up to about 70 feet away. And all of it seemed consistent in the fact that +20 MA didn't quite fix it... The wide end of the lens was the same.

-Mike




  
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Sunthing ­ Productions
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May 02, 2012 23:00 |  #1303

This test was done from about a foot away, with the body rested on the same counter as the batteries. Not sure how relevant such a distance is in a front focus test. Can someone more knowledgeable than myself interpret these results?

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May 02, 2012 23:42 |  #1304
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Sunthing Productions wrote in post #14370520 (external link)
This test was done from about a foot away, with the body rested on the same counter as the batteries. Not sure how relevant such a distance is in a front focus test. Can someone more knowledgeable than myself interpret these results?

Tamron is slightly (but clearly) front focused.

More importantly, how can anyone concentrate on the batteries in the shot?? As I can't take my eyes off those onion rings on the top left...:rolleyes:


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arentol
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May 02, 2012 23:44 |  #1305

Took 55 photos today. This was the only one "ruined" by onion bokeh, yet it is one of my favorite shots of the day...

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE



And this is a 100% crop of another photo f/4.0, 70mm.

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE

5D3 | Rokinon 14 f/2.8 | 16-35L II | TS-E 24L | Tamron 24-70 f/2.8 | Tamron 28-75 f/2.8 | Voigtlander 40 f/2.0 | Σ 50 f/1.4 | MP-E 65 | 70-200 2.8L IS II | Σ 85 f/1.4 | Zeiss 100 f/2 | Σ 120-300 f/2.8 OS | 580 EX II | 430 EX II | Fuji X10 | OM-D E-M5 | http://www.mikehjphoto​.com/ (external link)
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Tamron 24-70 f/2.8 Di VC USD Announced!!! Stabilized 24-70!
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