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Thread started 13 Dec 2013 (Friday) 23:44
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Tamron SP 150-600mm Di VC USD

 
gabebalazs
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Jan 26, 2014 08:49 |  #826

sploo wrote in post #16637791 (external link)
For LiveView contrast AF the system is just racking the focus in order to maximise the difference between pixels (though it may be aided by extra logic). For phase AF the image is split into two, and the phase sensor can detect by how much, and in what direction, the two images are out of phase. Hence AF can be much faster. As you say, little/no detail in the image (possibly due to everything being way out of focus) means there's not much detail to help the phase detection work - hence the apparent hunting.

Yes, looks like we agree on this.
As for the live view AF, mine is different, at least on my 70D, it is also phase detect AF.


SONY A7RIII | SONY A7III | SONY RX10 IV | SONY RX100 | 24-70 2.8 GM | 70-200 2.8 GM | 16-35 F/4 | PZ 18-105 F/4 | FE 85 1.8 | FE 28-70 | SIGMA 35 1.4 ART | SIGMA 150-600 C | ROKINON 14 2.8
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jbrackjr
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Jan 26, 2014 08:51 |  #827

the black fox wrote in post #16637849 (external link)
a very ill informed opinion there jason ,i didn't say single point expanded shouldn't be used its just not advisable ,any birder will try there hardest to focus on the birds eyes ,or if close enough the pupil of the eye ,this is best achieved in single point only .,and simply because i use a older camera now (as a matter of my choice ) does not mean i have not owned and used the latest bang up to date cameras recently ..

I think maybe your confused. Jason was speaking to BIF (not a perched bird). For you to be able to focus on their eye or best yet their pupil while in flight, I would assume the bird would have to be something the size of small plane. Our birds don't come that big.


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gabebalazs
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Jan 26, 2014 08:51 |  #828

Snydremark wrote in post #16637111 (external link)
Yes, shutter button is set to Metering Start and the AF-ON button to Metering and AF Start

OK, got it. I'll try it as soon as the freaking snow storm is over :confused:


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jase1125
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Jan 26, 2014 09:42 |  #829

the black fox wrote in post #16637849 (external link)
a very ill informed opinion there jason ,i didn't say single point expanded shouldn't be used its just not advisable ,any birder will try there hardest to focus on the birds eyes ,or if close enough the pupil of the eye ,this is best achieved in single point only .,and simply because i use a older camera now (as a matter of my choice ) does not mean i have not owned and used the latest bang up to date cameras recently ..

Please explain why it is not advisable? The assist points only are active if the center point moves off target. If the center point is properly put on the subjects eyes, like I and other do, then the assist points don't matter. Only if the subject moves off center or center loses contrast does the assist points matter. If that happens without the assist points, then you are screwed anyway. Like I said, I suggest you read up and you will find almost all pro birders use expanded af points (like sports shooters, etc.)

Regardless, this is a lens issue as it has some problems with a single point as well.


Jason

  
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Kickflipkid687
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Jan 26, 2014 09:57 |  #830

Snydremark wrote in post #16637049 (external link)
If you wouldn't mind trying this:
1. Center AF point, AI Servo, back button AF
2. Half press and hold the shutter button to engage IS
3. Using the back butto, AF on something 20yds away or so
4. Once focused, bump slightly OOF with the focus ring
5. Release and repress the back button to re-engage AF, without releasing the half press on the shutter

Does your refocus? Would be interesting to know on the 6 and 70


I just tested this, and I had the same "issue". I then put my Canon 70/200 F/4 L on, and it focused just fine after doing the same thing. So the Tamron was acting up. BUT, I had it set to 15m - Infinity.

I know that if you set your limiter to 15m-Infinity, you can focus on closer stuff sometimes, if you are already focused close. But if you focus far away and try to focus closer again, it will try to focus and stop at 15m. But this is not the same as what just happened. Just thought I'd mention that.

My lens did not attempt to AF, like said above.

But, I never actually had this happen in the field, 3 different times shooting. So i'm not that worried about it. But it is odd/sort of annoying that it happens.


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RAW-Shooter
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Jan 26, 2014 10:02 |  #831

the black fox wrote in post #16637849 (external link)
... its just not advisable..

Rubbish.

jbrackjr wrote in post #16637894 (external link)
Our birds don't come that big.

ROFLMAO!


BoKo
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Illume
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Jan 26, 2014 10:15 as a reply to  @ post 16610726 |  #832

Here's another at 600mm (f/8) and one at 552mm (f/8). Both taken in lower light conditions. Neither is cropped. Very minimal sharpening applied.

I'm enjoying this lens thus far and am getting more comfortable with its nuances. Weight-wise, it's heavier than the 100-400, and it's very similar in weight to the 70-200 2.8 II + 1.4c that I sometimes use.

So far - and it's still early (and in mostly poor conditions) - my Tamron is performing favorably to the Canon 100-400. I've used three examples of the latter, so I know its capabilities/limitatio​ns pretty well. Most of my "missed shots" with the Tamron have come from not turning the zoom ring fast enough. I find this more difficult than the push/pull design of the 100-400. I haven't tried using the Tamron as a push/pull yet.

I have not experienced the AF issues others are discussing in this thread, but I also haven't attempted to shoot BIF. Actually the AF is working at least as well as the 100-400 examples I've used -- faster perhaps in fact. The only oddity I've experienced were some images that seemed to be overexposed (when they shouldn't have been). This occurred while shooting in cold conditions (maybe 10 degrees or so) over a fairly lengthy period of time. The issue went away and has not returned.

My favorite shots thus far have been with the 7D, but only when I use ISO settings at 500 or lower. Otherwise, the 6D shots have better IQ (less noise). I think the 6D is a great camera, but I don't like being "confined" to using the center AF point (albeit very accurate). I just don't have the flexibility of composing my photo as I do with the more elaborate AF system on the 7D.

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IMG_2154_AmericanGoldf​inch (external link) by DreamInColor1 (external link), on Flickr

IMAGE: http://farm6.staticflickr.com/5493/12153639565_7f6a9557ca_b.jpg
IMAGE LINK: http://www.flickr.com …66682425@N02/12​153639565/  (external link)
_MG_0399_AmericanGoldf​inch (external link) by DreamInColor1 (external link), on Flickr

Canon 6D | Sigma 35 1.4 | 40mm pancake | 16-35 f/4 | 24-105L | 100L 2/8 | Tamron 150-600 VC
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gabebalazs
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Jan 26, 2014 10:18 as a reply to  @ post 16610726 |  #833

^^ Great stuff!!


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Kickflipkid687
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Jan 26, 2014 10:20 as a reply to  @ post 16610726 |  #834

Lovely shots!


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gabebalazs
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Jan 26, 2014 10:20 as a reply to  @ post 16610726 |  #835

Here are some snowstorm juncos. I named the first bird "Snowflake" :) (too bad there is a huge blurry snowflake in front of the bird)

Taken with my 6D, cropped about 50-70%

IMAGE: http://farm4.staticflickr.com/3690/12154582104_da860bd001_o.jpg
IMAGE LINK: http://www.flickr.com …29108710@N04/12​154582104/  (external link)
Snow flake junco (external link) by gabebalazs (external link), on Flickr

IMAGE: http://farm8.staticflickr.com/7403/12154431773_7bfa300c30_o.jpg
IMAGE LINK: http://www.flickr.com …29108710@N04/12​154431773/  (external link)
Tamron 150-600mm 6D junco 7 (external link) by gabebalazs (external link), on Flickr

IMAGE: http://farm3.staticflickr.com/2861/12154431313_f0c1d929d6_o.jpg
IMAGE LINK: http://www.flickr.com …29108710@N04/12​154431313/  (external link)
Tamron 150-600mm 6D junco 6 (external link) by gabebalazs (external link), on Flickr

IMAGE: http://farm4.staticflickr.com/3730/12154432353_eb44c8f76c_o.jpg
IMAGE LINK: http://www.flickr.com …29108710@N04/12​154432353/  (external link)
Tamron 150-600mm 6D junco 8 (external link) by gabebalazs (external link), on Flickr

IMAGE: http://farm6.staticflickr.com/5517/12154167855_bc836109c9_o.jpg
IMAGE LINK: http://www.flickr.com …29108710@N04/12​154167855/  (external link)
Tamron 150-600mm 6D junco 9 (external link) by gabebalazs (external link), on Flickr

SONY A7RIII | SONY A7III | SONY RX10 IV | SONY RX100 | 24-70 2.8 GM | 70-200 2.8 GM | 16-35 F/4 | PZ 18-105 F/4 | FE 85 1.8 | FE 28-70 | SIGMA 35 1.4 ART | SIGMA 150-600 C | ROKINON 14 2.8
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Illume
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Jan 26, 2014 10:21 as a reply to  @ post 16610726 |  #836

Wow -great shots of that junco! Nice work!!


Canon 6D | Sigma 35 1.4 | 40mm pancake | 16-35 f/4 | 24-105L | 100L 2/8 | Tamron 150-600 VC
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Kickflipkid687
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Jan 26, 2014 10:34 as a reply to  @ post 16610726 |  #837

Excellent work as usual! You can get some really great images with that lens!


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LV ­ Moose
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Jan 26, 2014 10:34 as a reply to  @ Illume's post |  #838

Wonderful shots, Gabe. Love the snowflakes in a couple of them.


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gabebalazs
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Jan 26, 2014 10:46 as a reply to  @ post 16610726 |  #839

thank you guys.


SONY A7RIII | SONY A7III | SONY RX10 IV | SONY RX100 | 24-70 2.8 GM | 70-200 2.8 GM | 16-35 F/4 | PZ 18-105 F/4 | FE 85 1.8 | FE 28-70 | SIGMA 35 1.4 ART | SIGMA 150-600 C | ROKINON 14 2.8
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bobbyz
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Jan 26, 2014 10:52 |  #840

the black fox wrote in post #16637849 (external link)
a very ill informed opinion there jason ,i didn't say single point expanded shouldn't be used its just not advisable ,any birder will try there hardest to focus on the birds eyes ,or if close enough the pupil of the eye ,this is best achieved in single point only .,and simply because i use a older camera now (as a matter of my choice ) does not mean i have not owned and used the latest bang up to date cameras recently ..

Bird in flight and keeping single point on the eye IN AI servo when using supertele? Wish I could do that. Using surrounding points for BIF shots is really worth it. And DOF is usually large at the distances involved even when shooting 500/600mm.


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Tamron SP 150-600mm Di VC USD
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