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05/03/2011 12:30:02 AM · #1 |
So I have a Canon 50mm 1.4. I use it with a 40d and a rebel xsi. Focusing at 1.4 was always hit & miss. Back focus and front focus. Sometimes like 6 out of ten hit. I used the lens on a friends 40d & 50d and I got the same results. Somebody told me I should consider getting a 1d body, because they focus better at those fast speeds. So I considered getting a used 1d mark II N. But then this wkd, I tried the 50mm on a 60d. Everything I focused at 1.4 was spot on. Ten out of ten, no back or front focusing. I also tried it on a 7d and kept going between the 60d and 7d. The focus was still spot on and faster with no hunting. I went back to another 50d, the problem returns. Did Canon change something on the AF for the 60d & the 7d??
Also! I would still prefer a 1d body if the focusing is as good as the 60d. But is it?? If not, i'll just get a 60d. I can get a 1d mark II N for about the same price. |
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05/03/2011 12:47:22 AM · #2 |
The 50D has lens calibration so you could always adjust it to get the focus you want. The 40D doesn't have that feature. The 60D and 7D also have this feature.
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05/03/2011 01:19:45 AM · #3 |
Originally posted by cpanaioti:
The 50D has lens calibration so you could always adjust it to get the focus you want. The 40D doesn't have that feature. The 60D and 7D also have this feature. |
Yes! Thats the micro focus adjustment. My friend tried it on the 50d. But it would still front and back focus. The 60d doesn't have that micro adjustment though. |
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05/03/2011 09:31:16 AM · #4 |
I've had a similar experience with the 50/1.4; mine was always hit or miss on my old 10D body, to the extent that I considered sending it in for repair. Then I bought the 5D, et voila! no more hit or miss focusing with the 50/1.4.
Oddly, the 10D body was pretty reliable with other lenses, and the focus error with the 50/1.4 was sometimes drastic, far worse than could be explained by the fast aperture. |
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05/03/2011 09:42:58 AM · #5 |
| I have no experience (yet) with lenses not focusing but I came across this post on Canon Rumours about lenses being "soft" and it is actually an interesting read. Might have something to do with some of the focusing issues people here have. |
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05/03/2011 10:02:45 AM · #6 |
| I have a 40D and the 1.4 and never have problems with the focus. |
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05/03/2011 10:45:25 AM · #7 |
Originally posted by Silent-Shooter:
I have no experience (yet) with lenses not focusing but I came across this post on Canon Rumours about lenses being "soft" and it is actually an interesting read. Might have something to do with some of the focusing issues people here have. |
Very interesting, indeed. |
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05/03/2011 11:26:49 AM · #8 |
Originally posted by tryals15:
Very interesting, indeed. |
Seconded! I had not encountered that post. It was *really* interesting to read about the "batch-related" issues that businesses like lensrentals.com encounter; as an engineer who deals with analyzing failure pattern on a regular basis, I agree with their conclusion that the observed differences in failure rate from batch to batch are not random at all. For instance, they observed that 4 of 6 Canon 300/4 lenses bought together developed early failures for electrical problems, vs. 0 of 30 for other batches. The chances of this being due to random variation are less than 0.1%. |
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05/03/2011 02:44:16 PM · #9 |
Originally posted by Silent-Shooter:
I have no experience (yet) with lenses not focusing but I came across this post on Canon Rumours about lenses being "soft" and it is actually an interesting read. Might have something to do with some of the focusing issues people here have. |
-3 +3 Tolerance Hmmm :) I admit, I didn't try the micro adjust on the 50d. But I don't know if it would make a difference, seeing as the lens sometimes front and back focus. I dont think the lens is defective, I think a newer body would prob work better as the 60d did. Maybe Canon optimized the focus point accuracy for faster than f2.8 on the 60d and the 7d.
Is there anyone that understand the way the focus points work on the 1d bodies as opposed to the new XX bodies??? |
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05/03/2011 02:51:05 PM · #10 |
Originally posted by dmadden:
Maybe Canon optimized the focus point accuracy for faster than f2.8 on the 60d and the 7d. |
Possibly. But my 5D dates from 2005 and does not have the erratic focus issue with the 50/1.4. Most of the modern Canon bodies have cross-type sensors at least on the center point, so if you are having issues with erratic focus (off, but not consistently in one direction or amount) then try center point only. |
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05/03/2011 06:52:49 PM · #11 |
I had this problem with my 10-22 lens. On my old rebel xt body the lens was sharp, never really noticed any issues with front and back focusing. Then I bought the 50d and ithe 10-22 seemed to be soft every time I used it. I evn tried the micro adjustment with the same issues. So I sold the lens! Maybe I should have sold the body? I don't seem to have that problem with my other lenses..or I haven't noticed.:)
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