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Thread started 11 Jul 2015 (Saturday) 12:29
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Sigma 150-600 sport help

 
Nascar ­ Nut
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Post edited over 8 years ago by Nascar Nut. (2 edits in all)
     
Jul 11, 2015 12:29 |  #1

My wife and I recently went to Yellowstone. I have been working through all my photos and I have a question. I will post an uncropped resized and a 100% crop for examples. This bear was between 100 and 150 yards away. I took several shots of him. I didn't have my tripod but had the camera was supported on a tree with the Os (IS) turned on. Shutter was 1600. As you can see in the crop, nothing is in focus. The focus point was on his shoulder. Every shot of this bear turned out like this. Is there something about this scene that my camera could not get a good focus? Maybe I shouldn't have had the OS on since I had it supported against a tree. Maybe I am expecting to much from a crop at this distance. My camera is a 7D Mark ll. I have hand held this setup at 600mm with great results with a lot slower shutter speeds but the subject was a lot closer. I am just trying to get a handle on what I can expect out of my setup. Maybe I am doing something wrong or I have an issue with my lens. I took some shots of other grizzlies with my tripod at similar distances but slower shutter speeds and it seems they turned out about the same.

IMAGE: http://the-outdoorsman.net/yellowstonephotos/sample100.jpg

IMAGE: http://the-outdoorsman.net/yellowstonephotos/sample101.jpg

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Philihase
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Jul 12, 2015 05:30 |  #2

I´d guess heat haze. It looks like the shot I get on hot days and there is a visible heat haze in the air.


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BigAl007
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Jul 12, 2015 07:54 |  #3

Philihase wrote in post #17628654 (external link)
I´d guess heat haze. It looks like the shot I get on hot days and there is a visible heat haze in the air.

Especially as its over a nice thick luxuriant layer of grass. You get an area that is generally a bit damp, and then the sun shines on it and you have to add the defraction caused by the varying amounts of water vapour, to the varying amounts of diffraction caused by the changes in temprature. This can become an issue over even quite small distances with a lens such as a 600mm, I would expect to start seeing effects at distances between about 30 to 50 yards/meters. The only good news is, if a breeze gets up, the worst of the effects vanish at wind speeds above about 12 miles per hour.

Annoying as it is for photography, I find this much more annoying as a competetive rifle shooter. As the diffraction moves the apparent visual location of the target, in relation to it's position in space. The mirage effect, as it is known, can double the amount of windage allowance you need for any wind speed. So it is good that above 12 mph it cannot effectivly form.

Alan


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DAA
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Jul 12, 2015 11:29 |  #4

Yes nothing worse than a "boil".

- DAA




  
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Nascar ­ Nut
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Jul 12, 2015 17:50 |  #5

Thanks guys for your responses. Well that does make sense as it was pretty warm. I shot some pics of grizzlies that were on the other side of a small lake and I could see the heat haze coming off the water so I knew those shots wouldn't turn out and they didn't. I couldn't see the heat haze when taking these shots so it got me wondering what I could doing wrong. Looks like on those hotter sunny days with no wind I need to get closer. I wonder if the grizzlies will play nice. lol




  
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Calhoun213
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Jul 14, 2015 10:13 |  #6

I had the same situation in Yellowstone last month. I was taking photos of a coyote feeding on a buffalo carcass about 140 yards away. Using a 7DII with a Tamron 150-600 mounted on a tripod. I was expecting some good shots but unfortunately almost all the photos showed distortion from the heat waves.




  
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RMyers
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Jul 14, 2015 15:01 |  #7

Plus you were at f6.3 600mm with is max zoom and wide open. Probably not the sharpest part of the lens. I have the previous 150-500 Sigma and a 7dm2 and it is soft wide open. Much better results stopped down to f8-11. Try some test shots at home throughout the zoom range, wide open to smaller f-stops. You'll find what works best for your combo.


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patrol50
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Jul 14, 2015 17:14 |  #8

RMyers wrote in post #17631530 (external link)
Plus you were at f6.3 600mm with is max zoom and wide open. Probably not the sharpest part of the lens. I have the previous 150-500 Sigma and a 7dm2 and it is soft wide open. Much better results stopped down to f8-11. Try some test shots at home throughout the zoom range, wide open to smaller f-stops. You'll find what works best for your combo.


thatsan interesting comment - because have read in a couple of reviews where the sigma 150 - 600 is reputedly sharper wide open at f6.3 and 600 than the tamron 150 - 600 is and my tamron is certainly a bit soft at 6.3 & 600 imho

cheers rob


C:- 7D Mk11 ; 7Dc ; 600D & SX10 IS / L:- EFS 10-22 f3.5-4.5 USM ; 55-250 f4-5.6 IS 11; 18 -200 f3.5-5.6 IS ; & EF 16- 35 f4 L IS USM , 24-105 f4 L IS USM; 70-200 f4 L IS USM; 100-400 f4.5-5.6 L IS 1 USM (V1 and V11); + C 1.4 Ext Mk3 & Tam 150 - 600 f5-6.3 DI VC USD.

  
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johnf3f
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Jul 14, 2015 17:33 |  #9

Even without heat haze, dust in the air etc etc you will rarely get really detailed wildlife shots at that sort of range. The most detailed shots are nearly always the closest. Though I would advise caution with subjects that might eat you!
Here in the UK wildlife is not likely to harm you, though I have been chased by Deer in the Rut, so I get as close as sensible to my subjects. I rarely shoot beyond 50 yards and often shoot closer than the 6 meter minimum focus distance of my Canon 800 F5.6 L IS (by using extension tubes) on small birds.


Life is for living, cameras are to capture it (one day I will learn how!).

  
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basketballfreak6
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Jul 14, 2015 19:18 |  #10

hey nascar have you had a chance to test the lens in a more controlled setting? hope it really is just haze, i know the lens is capable of very sharp images wide open at 600mm, i was lucky with my copy AF stellar out of box and images having good sharpness

here is one wide open 600mm at ISO 2500 just to show what the lens is capable of

IMAGE: https://farm9.staticflickr.com/8839/18155584542_c279b8bf62_b.jpg
IMAGE LINK: https://flic.kr/p/tEm7​KG  (external link) Grey Fantail (external link) by Tony (external link), on Flickr

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R6, M6II, modified 77D, 16-35L f/4 IS, 24-70L II f/2.8, 70-200L IS II f/2.8, S150-600 f/5-6.3 C, S14 f/1.8 ART, S50 f/1.4 ART, S135 f/1.8 ART, 100L IS Macro f/2.8

  
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Nascar ­ Nut
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Jul 15, 2015 16:36 |  #11

Thanks all for your comments. I have gotten plenty of sharp photos at closer distances so I am going with the heat haze as the problem. Here is a shot hand held shutter speed 320 and wide open.

IMAGE: http://www.the-outdoorsman.net/temp/150-600/IMG_3006042615.jpg



  
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MalVeauX
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Jul 16, 2015 01:02 |  #12

Heya,

I shoot with 600mm, and even wide open, that lens would have been sharper by far than what you captured.

What you grabbed was heat distortion. I shoot over water and foliage a lot, and it does matter. Even if it's relatively cool outside, strong reflecting sun will produce heat haze and shooting through it is very troublesome (never getting focus, ever, even manually in Live View), and longer focal lengths just exacerbate the effect. There's literally nothing you can do, other than get closer, or move to another location and wait for another shot.

Very best,


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ed ­ rader
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Jul 17, 2015 00:00 |  #13

heat distortion :lol:


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colintf
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Jul 17, 2015 00:49 as a reply to  @ ed rader's post |  #14

You had the camera / lens supported by a tree and the IS switched on?

I would of switched it off as it sounds similar as being mounted on a tripod


Just a thought :-)




  
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DreDaze
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Jul 17, 2015 02:17 |  #15

ed rader wrote in post #17634201 (external link)
heat distortion :lol:

no canon lenses ever suffer heat distortion...


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Sigma 150-600 sport help
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