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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 03 Oct 2014 (Friday) 09:46
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Need help on my new sigma 50 1.4

 
Jiggo0109
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Oct 03, 2014 09:46 |  #1

Hi,

Just got my sigma 50 non art few hours ago and was happy with the build. I took some shots with a 600D (my 70d still at canon service center) and noticed something I can't understand.

First, it nails focus. I took 10 consecutive shots (handheld) and gave me an almost perfect rate.

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Second, while doing the shots, I didn't hear any lens focus hunting so I stopped and looked at the photos. They were from sharp to acceptably sharp ones (posted was the sharpest). So, I defocused the camera to make it hunt, took seven shots. It hunted at the first shot and remained silent on the remaining six shots. But this time, they were 100% OOF.
IMAGE: https://farm4.staticflickr.com/3933/15241894320_60092c989e_c.jpg

What am I experiencing with lens? It does not hunt if the shot is near to the focus plane of the previous shot is also a thing I noticed. I have to rotate the ring (just enough to blur the target) to make it hunt. The funny thing is its consistent, if it gave you a sharp one at first shot, it will make the rest sharp (still subjects) and vice versa. Again, I'm happy with it,. I just need to deal on this one.

These were at 1.4, 1/200, iso 100, bounced speedlite at 1/4. Mid point used aimed on the 24 105 (lensband). Distance is at 3-4 ft.



  
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Sirrith
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Oct 03, 2014 10:19 |  #2

Seems to be focusing on the snowglobe(?) behind the 24-105 in the 2nd shot. Remember the AF point covers more area than the little black square, and the snowglobe is a higher contrast target than the red ring on the lens.


-Tom
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Left ­ Handed ­ Brisket
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Oct 03, 2014 12:19 as a reply to  @ Sirrith's post |  #3

Agreed with the above.

It's not unusual that a camera/lens would not try to reacquire a new focus point if the composition doesn't change. Try focusing away and back a few times. Also, what would a proper exposure be without flash?


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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EchoShotz
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Oct 03, 2014 12:43 as a reply to  @ Left Handed Brisket's post |  #4

I saw a post on here from a while back, about some odd problem and this may be a shot in the dark, but try taking off the flash and taking pictures.


5D Mark III, 70-200 f/2.8L, 24-70 f/2.8 L, YN560 (2x)
-Kenny

  
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Jiggo0109
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Oct 03, 2014 20:35 |  #5

If i took off the flash, I get 1/30 and iso 800 with the 600d. Ill test it outdoor today.




  
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Need help on my new sigma 50 1.4
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