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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!

 
Sunthing ­ Productions
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May 03, 2012 12:45 |  #1321

DDL wrote in post #14372101 (external link)
For the Tamron the stated minimum focal distance is 38 cm (15 inches); in both cases the test is probably at or slightly less than the MFD. Given that the test doesn't look that different between lenses other than the onion bokeh on the Tamron. It's hard to compare as the focal length and angle between the two shots is different.

For MFA Canon states to do it at 50 x focal length or at the normal distance at which the lens is going to be used.

Thanks for that. I just did this test with the Tamron at a distance of 15" away from the batteries @ 70mm. I started with 0 microadjust, and each following picture increased microadjust by +5, so 0, +5, +10, and +15.

Keep in mind the center focus point is aimed at the 3rd from left Duracell battery. Can someone recommend which microadjust amount would be appropriate for my copy?

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bomzai
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May 03, 2012 12:48 |  #1322

Sunthing Productions wrote in post #14373544 (external link)
Thanks for that. I just did this test with the Tamron at a distance of 15" away from the batteries @ 70mm. I started with 0 microadjust, and each following picture increased microadjust by +5, so 0, +5, +10, and +15.

Keep in mind the center focus point is aimed at the center Duracell battery. Can someone recommend which microadjust amount would be appropriate for my copy?

OLD: +4

I fail at reading comprehansion :), somehow thought you focused on Enegizer, not Dura :)

New: +9


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Sunthing ­ Productions
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May 03, 2012 12:49 |  #1323

bomzai wrote in post #14373558 (external link)
+4.

Edited my post to say "3rd from left" Duracell.


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May 03, 2012 12:51 as a reply to  @ Sunthing Productions's post |  #1324

+10 seems the sharpest to me. Somewhere between +5 and +10, closer to 10 I would say.


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May 03, 2012 12:55 as a reply to  @ amirg's post |  #1325

I'm not an AFMA expert but shouldn't you use a more normal shooting distance instead of MFD at 70mm? or are you expecting to use the lens at these settings the most time, e.g. semi-macro work?


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arentol
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May 03, 2012 12:58 |  #1326

Set it to +8, back off until you are 11 feet away and try again. You may need to separate the batteries a few inches to be able to see the DOF change.


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CeVe
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May 03, 2012 12:59 |  #1327

bomzai wrote in post #14373558 (external link)
+4.

Agreed.
+5 already seems to far!

Keep in mind that it changes a bit with focal length so I would also test it @50mm.
See what that tells you...

For example if it would rather be +2 I would opt for +3 on your lens.
If it would rather be +8. I would go for +6.

Keep in mind at lower focal length the magnification (given the same distances etc.) become lower and the dof becomes bigger so always prioritize 70mm but take 50mm also into consideration.




  
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arentol
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May 03, 2012 13:08 |  #1328

Focus is on the word Duracell on the third battery from left..... The word Energizer, third from Right, is sharper at +5 than Duracell is, and Duracell is slightly sharper at +10 than it is at +5... So I don't see how people are getting +4.


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May 03, 2012 13:27 |  #1329

Me either, on my monitor, +15 looks the sharpest....And....Do the test the distance you'd normally be shooting from the most...For me, I shoot at MFD with some primes most of the time, but with my walkaround zoom I shoot from 5' to 10' maybe 15' typically...


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May 03, 2012 13:41 |  #1330

thatkatmat wrote in post #14373786 (external link)
Me either, on my monitor, +15 looks the sharpest.

Really? At my end it is obviously back-focusing at +15 (second Duracell from left becomes sharper than the third at +15).


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GregoryF
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May 03, 2012 13:44 |  #1331

To my eyes the +10 looks the best.


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Sunthing ­ Productions
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May 03, 2012 13:49 |  #1332

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.


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CeVe
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May 03, 2012 14:03 |  #1333

arentol wrote in post #14373668 (external link)
Focus is on the word Duracell on the third battery from left..... The word Energizer, third from Right, is sharper at +5 than Duracell is, and Duracell is slightly sharper at +10 than it is at +5... So I don't see how people are getting +4.

I still read his post before he edited it.

After his edit I would have to agree.




  
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May 03, 2012 14:11 as a reply to  @ CeVe's post |  #1334

I just pulled the plug and ordered mine. Fingers crossed its a good one and I like it. I have a wedding to shoot next week so I needed 2.8 and a wide angle.


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May 03, 2012 14:11 as a reply to  @ CeVe's post |  #1335

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.

Canon recommends 50 times the focal length. I have seen some AFMA tutorials 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.


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