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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Nov 2013 (Thursday) 09:38
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Tamron developing 150-600mm VC USD lens

 
Kickflipkid687
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Jan 25, 2014 18:28 |  #2821

I haven't had my AF stop on me, so that might be why, what you said.
But I've had it be focused, then when I try to refocus , it will go all the way out, then back in sometimes.... which then causes me to miss a shot.


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vsocks
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Jan 25, 2014 18:30 |  #2822

I have to get out and shoot mine now with all this talk. Busy week of work since I got it...plus crap weather. Inside mine seems to focus OK, but honestly haven't done much but mount it.
Maybe in the morning a bit if snow storm isn't too bad!


Canon 6D, 70D, Rokinon 14mm, 17-40 F4L, Zeiss Planar 50mm f/1.4 T* ZE, 50 f1.8, 85 f/1.8, Canon 24-105 F/4L, 70-200 2.8L IS II, Tamron 150-600 VC, Speedlight 430EX II, 12mm Extension Tube, Canon 1.4X & 2.0X iii Converters

  
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fairygen
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Jan 25, 2014 18:36 |  #2823

Allez wrote in post #16636641 (external link)
Please see above. Could my 'problem' be what the issue is?

The 650d (or any other of the rebel series I beleive) doesn't have that function, so if it is that issue, it's something hard coded into the camera that I can't change myself.

Seems odd that they wouldn't test to destruction with the rebel line, as a lens in this price bracket is pretty appealing to occasional and hobbyist shooters who mostly use them.




  
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peteg1
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Jan 25, 2014 18:47 |  #2824

Allez wrote in post #16636626 (external link)
:oops: User error - had camera set so Lens Drive when AF Impossible set to Off - no problem once that was changed to On :oops:

Yes, that setting would be a problem. So far my 70D/5D III worked just fine today, AF with the 70D/150-600 was the same as using the 100-400.


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jase1125
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Jan 25, 2014 20:08 |  #2825

peteg1 wrote in post #16636679 (external link)
Yes, that setting would be a problem. So far my 70D/5D III worked just fine today, AF with the 70D/150-600 was the same as using the 100-400.

Did you use single point? Apparently it isn't a problem when using single point. I was using zone and single expanded. (+4). It wouldn't even attempt to focus on birds in flight.


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Snydremark
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Jan 25, 2014 20:26 as a reply to  @ jase1125's post |  #2826

jase1125 wrote in post #16635988 (external link)
So I just finished taking the lens on a test drive. For BIF, it is a complete fail. In fact, I'm returning the lens and sticking to my 100-400L. The reason is if the lens is prefocused toward the minimum to middle of the focusing range, sometimes it will not even try to acquire an Osprey or Duck in flight. The AF light blinks in the viewfinder on the 1Dx but the lens elements doesn't even attempt to move. I have to use my thumb to turn the focus ring close to focus on the subject and then AF will move and attempt to acquire the subject. So for every bird in flight, I had to manually pre-focus before AF would engage and track the subject. IQ wise, it appears comparable to the 100-400L @ F8. Bummer the AF doesn't work well though.

Yep, this consistent with my experience today, as well. Any time focus is attempted where the lens isn't already mostly there causes it to rack ALL the way out and back in. This is on the 7D, which works moderately well with the 100-400.

There is also an oddity with AF and back button focusing, where if servo focus is interrupted (by bumping the focus ring), it will not re-engage without releasing both the focus button AND the shutter button, which I normally continue to hold to maintain IS.

I won't be able to review images and check my results for the weekend until probably Monday; if the images aren't notably better than my previous attempt, now that I've had better light, I may well be sending it back as well. Taking the extra time to learn to shoot at 600 would ve fine if the damned thing functioned without a hitch otherwise...but these autofocus oddities I'm not willing to put up with for mediocre images.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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peteg1
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Jan 25, 2014 20:51 |  #2827

jase1125 wrote in post #16636837 (external link)
Did you use single point? Apparently it isn't a problem when using single point. I was using zone and single expanded. (+4). It wouldn't even attempt to focus on birds in flight.

Yes, single point all day. When I would overshoot my target the focus would go out and come back in (just like my 100-400).


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bobbyz
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Jan 25, 2014 21:02 |  #2828

jase1125 wrote in post #16635988 (external link)
So I just finished taking the lens on a test drive. For BIF, it is a complete fail. In fact, I'm returning the lens and sticking to my 100-400L. The reason is if the lens is prefocused toward the minimum to middle of the focusing range, sometimes it will not even try to acquire an Osprey or Duck in flight. The AF light blinks in the viewfinder on the 1Dx but the lens elements doesn't even attempt to move. I have to use my thumb to turn the focus ring close to focus on the subject and then AF will move and attempt to acquire the subject. So for every bird in flight, I had to manually pre-focus before AF would engage and track the subject. IQ wise, it appears comparable to the 100-400L @ F8. Bummer the AF doesn't work well though.

400mm f5.6 rules. I think folks were expecting too much. I really wish it was $2000 lens with very good AF. Guess I will wait for a while.


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gabebalazs
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Jan 25, 2014 21:30 |  #2829

I think Tamron may have released this lens a bit too soon without ironing out the fine details of the AF. Probably some of these issues they did not anticipate. I'm sure new copies (sometime in the future) will have their AF fixed. Lenses already out will have to be sent in. That's just my guess.

I have no problem on my 6D. My 70D has the zone and 19-point AF problem when focusing from near to far. IQ is pretty good, I posted a few pics today in the other thread.


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pknight
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Jan 25, 2014 21:56 as a reply to  @ gabebalazs's post |  #2830

A question for those having AF problems with BIF. Are these attempts at 600mm or at shorter focal lengths? At 600mm the angle of view is less than 5 degrees on FF, and less than 2.5 degrees on a crop. I would expect it to be difficult to obtain initial focus on a moving target at 600mm, simply because it would be difficult to locate the target and keep it in the viewfinder. Of course, that wouldn't necessarily explain why it fails to search. However, I wonder if you are having better luck at shorter focal lengths, such as 400mm.

FWIW, what is being described here does not sound that much different than what I experience with the 100-400 when I lose the target against a clear or overcast sky.


Digital EOS 7D Mark II Canon: EF 50mm f/1.8 II, EF 50mm f/2.5 Compact Macro, Life-Size Converter EF Tamron: SP 17-50mm f/2.8 DiII, 18-400mm f/3.5-6.3 DiII VC HLD, SP 150-600 f/5-6.3 Di VC USD G2, SP 70-200 f/2.8 Di VC USD, 10-24mm f/3.5-4.5 DiII VC HLD Sigma: 30mm f/1.4 DC Art Rokinon: 8mm f/3.5 AS IF UMC

  
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Snydremark
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Jan 25, 2014 22:15 |  #2831

pknight wrote in post #16637043 (external link)
A question for those having AF problems with BIF. Are these attempts at 600mm or at shorter focal lengths? At 600mm the angle of view is less than 5 degrees on FF, and less than 2.5 degrees on a crop. I would expect it to be difficult to obtain initial focus on a moving target at 600mm, simply because it would be difficult to locate the target and keep it in the viewfinder. Of course, that wouldn't necessarily explain why it fails to search. However, I wonder if you are having better luck at shorter focal lengths, such as 400mm.

FWIW, what is being described here does not sound that much different than what I experience with the 100-400 when I lose the target against a clear or overcast sky.

Definitely at 600, but not due to losing them in the viewfinder for me. When I acquired the swans I was trying for they were 'somewhat' in focus to start with and I could see wing movement throughout the searching; it just never grabbed, and gave up after one run through the range.

Edit: I'll add that while it sounds similar, it isn't...it's much worse. I've shot the 100-400 constantly for 5+ years and never encountered behavior this bad.


- Eric S.: My Birds/Wildlife (external link) (7D MkII/5D IV, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS I/II)
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MCAsan
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Jan 25, 2014 22:52 |  #2832

Anyone with a backordered unit at B&H or Adorama been given any indication when they can expect delivery?




  
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Jeff ­ Donald
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Jan 25, 2014 23:35 |  #2833

AF may be inconsistent on a crop sensor body. The center point is limited to f/5.6 in AF. The Tamron is f/6.3 from about 400mm on, so the AF sensors are restricted by the narrower opening. The body attempts to focus because the lens reports the aperture as f/5.6. I doubt FF cameras with f/8 AF are having the same issue when using the center AF point.




  
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Levina ­ de ­ Ruijter
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Jan 26, 2014 00:30 |  #2834

I see people starting to leave the same comments in all three Tamron threads now. Maybe we should stick to just one of the threads now? I don't know, just a suggestion to make life easier. :)


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jbrackjr
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Jan 26, 2014 01:11 |  #2835

Jeff Donald wrote in post #16637239 (external link)
AF may be inconsistent on a crop sensor body. The center point is limited to f/5.6 in AF. The Tamron is f/6.3 from about 400mm on, so the AF sensors are restricted by the narrower opening. The body attempts to focus because the lens reports the aperture as f/5.6. I doubt FF cameras with f/8 AF are having the same issue when using the center AF point.

See post 2811 by Jase1125, he used a 1DX and had the same or similar problem. Not a good sign.


Jim
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Tamron developing 150-600mm VC USD lens
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