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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!

 
CeVe
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May 03, 2012 14:16 |  #1336

Sunthing Productions wrote in post #14373910 (external link)
Can someone layout, in the simplest terms possible, what distance away from the batteries I should be for each focal length? e.g. 24mm=15". I want the tests to be as accurate as possible. I tested from 11' away @ 70mm and I couldn't make out much.

If you would test this tamron at 1m (3,28 feet) at 24mm F2.8 you would already get 0.3m DOF (almost 1 feet).
It would be quit bad if it exhibited bad focus after correcting it at lets say 50mm!

If I were you I would do a test at 50mm , about 30 inches away from your subject (batteries) . Place the batteries not straight behind each other (as to exclude focus error due to camera picking wrong subject) but leaf a slight gap in between.
Also place the batteries exactly one inch behind each other. measured from the edge of the table.

Then take a picture from the edge of the table with adjustments +6 +8 +10 +12.
It will become quiet clear where the focus is moving itself when you leaf a little gap in between.
This gap (1inch) is slightly smaller than the dof=> but ofcourse when the focus is dead on the middle battery it will only span the depth between the front and back battery!!




  
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davidc502
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May 03, 2012 14:19 |  #1337

Apparently I need to get my eyes checked.... I'm thinking +6 or maybe +7 gets the job done.


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CeVe
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May 03, 2012 14:19 |  #1338

amirg wrote in post #14374049 (external link)
Canon recommends 50 times the focal length. I have seen some AFMA tutroail suggest 20-25 times the focal length. However you have to see in your own case what is the distance you would use most often while shooting.

50 times??
That's a lot!

50mm would make this 2500mm or => 2.5meter = more than 8 feet.
DOF would be a lot > around 0.3m !




  
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Charlie
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May 03, 2012 14:25 |  #1339

sunthing, I think your batteries are too close together, and focus maybe missing. Spread them apart more.


Sony A7riii/A9 - FE 12-24/4 - FE 24-240 - SY 24/2.8 - FE 28/2 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 100-300 - Astro Rok 14/2.8 - Tamron 17-28/2.8 - 28-75/2.8 RXD, 70-200/2.8 VC

  
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thatkatmat
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May 03, 2012 14:27 |  #1340

amirg wrote in post #14373862 (external link)
Really? At my end it is obviously back-focusing at +15 (second Duracell from left becomes sharper than the third at +15).

oops, read his post wrong...
So, 10 doesn't look perfect either, maybe +8....but..if the person doing the test cant tell, then what's it matter....lol


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amirg
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May 03, 2012 14:32 |  #1341

thatkatmat wrote in post #14374133 (external link)
oops, read his post wrong...
So, 10 doesn't look perfect either, maybe +8....but..if the person doing the test cant tell, then what's it matter....lol

I would say +8 with the photos provided but I would repeat the test at a longer distance, not the MFD for sure.


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Bakewell
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May 03, 2012 15:09 as a reply to  @ amirg's post |  #1342
bannedPermanent ban

Thinking it’s time I put in my 2 cents worth. For the record, I love my Canon 15-85. It is crystal sharp; extremely versatile…a perfect walk-around lens. But…has something more appropriate arrived?

This Tamron 24-70 may change things. The one thing I was missing was the constant 2.8. Combined with the same 4 stop VC… PLUS weather sealing made me want to try it.
Below are two pics. They are 70mm @ 2.8 70mm. I notice the beginning of so called “onionetting” in the upper right corner of the first. Is this bad? You be the judge.

The second is a 100% crop of the center focused subject (point). Could I ask for more? This lens works for me. This lens combined with a new UWA completes me!


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Charlie
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May 03, 2012 15:24 |  #1343

I did comparison tests on FM Canon L mk1 vs Tamron sharpness
http://www.fredmiranda​.com/forum/topic/11103​37/ (external link)

summary:

Center @70mm F2.8

IMAGE: http://farm8.staticflickr.com/7205/7139789755_ba76b64c03.jpg
IMAGE LINK: http://www.flickr.com/​photos/charlie617/7139​789755/  (external link)
70mm 2.8 Center (external link) by charlie617 (external link), on Flickr

Corners @70mm F2.8
IMAGE: http://farm9.staticflickr.com/8152/6993578686_6c6f1103c4_b.jpg
IMAGE LINK: http://www.flickr.com/​photos/charlie617/6993​578686/  (external link)
24-70s 70mm 2.8 (external link) by charlie617 (external link), on Flickr

Corners @24mm F2.8
IMAGE: http://farm8.staticflickr.com/7132/6993443664_009165c1b5_b.jpg
IMAGE LINK: http://www.flickr.com/​photos/charlie617/6993​443664/  (external link)
24-70s 24mm 2.8 (external link) by charlie617 (external link), on Flickr

for reference shots, most of my flicker stuff before May is shot with the Canon 24-70L mk 1

All tests performed with live view, manual focus, tripod. Results look very similar to what charts have said to this point. tamron a bit wider all around from the narrow end to the long end, exactly as lensrental indicated.

Sony A7riii/A9 - FE 12-24/4 - FE 24-240 - SY 24/2.8 - FE 28/2 - FE 35/2.8 - FE 50/1.8 - FE 85/1.8 - EF 135/1.8 Art - F 600/5.6 - CZ 100-300 - Astro Rok 14/2.8 - Tamron 17-28/2.8 - 28-75/2.8 RXD, 70-200/2.8 VC

  
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Leffe67
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May 03, 2012 15:34 |  #1344

Has anyone posted a side by side comparison of bokeh quality and bokeh balls between the Tamron 24-70mm F2.8 VC and the Canon 24-70mm F2.8 L? Just curious as this seems to be an issue that keeps coming up.

I can see the issue on some of the Tamron shots when I am looking for it, but I don't know what the relative performance is of the Canon in the same circumstances.


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Sunthing ­ Productions
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May 03, 2012 15:55 |  #1345

http://img.photobucket​.com …314/Xcellere/co​mpare1.jpg (external link)


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mafoo
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May 03, 2012 15:56 |  #1346

Leffe67 wrote in post #14374546 (external link)
Has anyone posted a side by side comparison of bokeh quality and bokeh balls between the Tamron 24-70mm F2.8 VC and the Canon 24-70mm F2.8 L? Just curious as this seems to be an issue that keeps coming up.

I can see the issue on some of the Tamron shots when I am looking for it, but I don't know what the relative performance is of the Canon in the same circumstances.

I would like to see this as well.


-Jeremy
5D Mk II | SL1 | 24-105 f4.0L IS | 70-200 f2.8L IS | S35 1.4 | 40 2.8 Pancake | Samyang 14 2.8 | 430EX II

  
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Sunthing ­ Productions
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May 03, 2012 16:08 |  #1347

http://img.photobucket​.com …314/Xcellere/co​mpare2.jpg (external link)


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bomzai
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May 03, 2012 16:10 |  #1348

Leffe67 wrote in post #14374546 (external link)
Has anyone posted a side by side comparison of bokeh quality and bokeh balls between the Tamron 24-70mm F2.8 VC and the Canon 24-70mm F2.8 L? Just curious as this seems to be an issue that keeps coming up.

I can see the issue on some of the Tamron shots when I am looking for it, but I don't know what the relative performance is of the Canon in the same circumstances.

Canon's bokeh looks to be softer from the samples I looked at. Then again it's softer at focus point too ;)

So far I see this one as a perfect replacement to 24-105, not so much as an upgrade to 24-70 I (they are too different in what they do best).


Camera: EOS 5D Mark III, EOS 70D, ™24-70mm f2.8 VC, EF 70-200mm IS f2.8 L II, EF 100mm IS f2.8 L Macro, EF-S 18-135 STM, Σ 12-24 II.
EOS 5D mkII, 20D, S100, EF 24-70mm f2.8 L, EF 24-105mm IS f4.0 L, EF 70-200mm IS f4.0 L, EF-S 18-200mm IS, EF 100mm f2.8 macro
Light: Sun, Speedlite 580EXII, 550EX, 430EX, EL-Skyports, Reflectors, Umbrellas, Diffusers etc.

  
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liquidtek
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May 03, 2012 16:19 |  #1349

fstoppers review http://fstoppers.com …m-2-8-vc-vs-canon-24-70mm (external link)


1D mk IV | 17-40 f4L | 70-200 2.8L IS II | 50 1.8 | Tamron 28-75 2.8 | Canon 430EX II
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davidc502
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May 03, 2012 16:26 |  #1350

Leffe67 wrote in post #14374546 (external link)
Has anyone posted a side by side comparison of bokeh quality and bokeh balls between the Tamron 24-70mm F2.8 VC and the Canon 24-70mm F2.8 L? Just curious as this seems to be an issue that keeps coming up.

I can see the issue on some of the Tamron shots when I am looking for it, but I don't know what the relative performance is of the Canon in the same circumstances.

I think it keeps coming up because this lens has been anticipated for quite some time. There seems to be a emphasis on things that are not perfect like vignetting for example.

#1. As to the bokeh balls, how often are they in your shots, and of those shots how many will show "onioning".

#2 Of the ones that "onion", how many of those will be cropped to the point where one can actually see the swirls?

I think the problem is blown out of proportion, but I would expect there is a certain number of photographers who would be more affected by this than others (each has their own style I.E. night photography). So, to some this problem would be totally unacceptable, and that would be understandable. Each person is going to have to weigh the strenghts and weaknesses and see if it is going to affect their shooting style.

David


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Tamron 24-70 f/2.8 Di VC USD Announced!!! Stabilized 24-70!
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