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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 09 Oct 2013 (Wednesday) 14:24
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AF in low light: 2.8 vs 1.8

 
artyH
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Oct 10, 2013 08:10 |  #16

I have gotten pretty accurate AF from my 85 F1.8, 35F2 and 50F1.4. I generally shoot at F2 with these lenses and smaller with the 85. Depth of field is pretty slim with the 85, even at F2.8 on my crop, and would be much less on a 6D.
I use the 35 mm focal length much more than the others, and have no difficulties with the old 35F2 lens wide open, even at night with mixed artificial room lighting. Here, F2.8 would not work for me. If photographing people, you need high enough shutter speeds, and the IS on my newer 35F2IS won't help. It does allow very slow shutter speeds when shooting objects, say 1/15 or 1/20 sec. I use center point focus and never recompose in low light...I crop afterwards.




  
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D ­ 550D
THREAD ­ STARTER
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Oct 10, 2013 08:35 |  #17

sharraleigh wrote in post #16359873 (external link)
The nifty 50, despite being 1.8 is horrible, horrible, HORRIBLE at focusing in low light.

I see you have both 550D and 70D. I would love to hear how do they compare in low light regarding the AF.


http://domenulbl.blogs​pot.com/ (external link)
550D|Sigma 18-35 1.8 Art|Sigma EX 70-200 OS|Nifty Fifty|Samyang 85 1.4|430 EX II|

  
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sharraleigh
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Oct 11, 2013 01:14 |  #18

I always use 1.8 and 2.8 lenses on both bodies, so I haven't noticed much of a difference for still subjects, but for action, the 70D is definitely much faster and more accurate.


Canon 70D, 550D + Tamron 24-70 f2.8 VC, 28mm f1.8, 85mm f1.8, 50mm f1.8
Flickr (external link)

  
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apersson850
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Oct 11, 2013 02:53 |  #19

Gobeatty wrote in post #16358957 (external link)
I've been pondering related questions lately. I returned a 50 1.4 because the dang thing was just too inconsistent in focusing and required +13 or so of adjustment to get it in the ballpark.

I've tried two different EF 50 mm f/1.4 USM on five different camera bodies. Both lenses required around +12 adjustment on 7D cameras and +8 on 1DX. They were useless on the 40D, which doesn't have any AF adjustment.


Anders

  
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artyH
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Oct 11, 2013 08:29 |  #20

The Tamron has been reported, by lots of users, to have slow AF in low light. It isn't the F2.8, it is likely to be that particular lens. Wedding photographers use the 24-70f2.8 in dim lighting, and crop users report fast AF with the 17-55IS F2.8. Many lenses are faster in AF in good light, but some designs are just very slow or poor as the light gets very low.




  
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AF in low light: 2.8 vs 1.8
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