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#1
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Beware - focus problem with Canon 17-55mm lens
The much-praised Canon 17-55mm/2.8 lens shows variable autofocus
problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. The effect is often missed because users tend to stop the lens down when shooting outdoors, increasing the DOF to the point that the distant subject is sufficiently sharp. But when users open up. the distant subject can go blurry, with the focal plane falling in the foreground. The error seems to occur all the time when focusing into the distance in susceptible systems, but the extent of the error varies randomly. Sometimes you will get three or four sharp pictures, followed by a few very blurry results, all taken with the same settings. In my own experience using the lens with my 7D Mark II, about 2/3 of the results are unacceptable when shooting at f/2.8. I also get failures at f/5.6 and other apertures. My lens has shown this autofocus failure on my 40D, XSi, 7D, and now on the 7D2. I have six other Canon lenses, and they all focus fine. So I conclude it is not the body, but the lens. The AF failure never occurs indoors where distances are shorter. And the failure never occurs in live view, whether I am shooting short or long distances. The lens has been to Canon service five times. Each time, they say the lens meets all specifications. And each time, the AF failures continue. Recently I have had an opportunity to test a second copy of the lens, and it behaves exactly the same as my lens. I can't say for sure, but I think all copies have this fault. Some users get consistent sharp results with this lens, though. It seems that the body used affects the behavior. I have found that the lens almost always gives sharp results on my Rebel SL1. Others report that good results are obtained on the 7D, but not the 7D2. The focus issue with this lens is very poorly documented on the Web, but a search in Google will turn up some instances. If you are in the market for the Canon 17-55mm lens, and if the distant-focus issue is a concern of yours, I suggest you test the lens carefully with your body during the dealer's return period to determine if the lens is satisfactory for your intended use. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#2
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Beware - focus problem with Canon 17-55mm lens
Wally Wrote in message:
The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... -- Bats can't tell us apart! ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#3
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Beware - focus problem with Canon 17-55mm lens
On Wed, 6 May 2015 10:02:29 +0200 (CEST), android
wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#4
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Beware - focus problem with Canon 17-55mm lens
In article ,
Wally wrote: On Wed, 6 May 2015 10:02:29 +0200 (CEST), android wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. I don't own that lens but if I had that problem then I would give those links a good shoot! It is a fast lense in it's class and those might benefit from MFA, if available. -- teleportation kills |
#5
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Beware - focus problem with Canon 17-55mm lens
On Thu, 07 May 2015 04:54:08 +0200, android wrote:
In article , Wally wrote: On Wed, 6 May 2015 10:02:29 +0200 (CEST), android wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. I don't own that lens but if I had that problem then I would give those links a good shoot! It is a fast lense in it's class and those might benefit from MFA, if available. Nonsense. Variable focus errors can't be fixed by MFA. Those who actually have the 17-55mm lens can quickly show whether the lens with their body has the problem -- or maybe they have already seen the problem but blamed themselves for the blurry results. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#6
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Beware - focus problem with Canon 17-55mm lens
In article ,
Wally wrote: On Thu, 07 May 2015 04:54:08 +0200, android wrote: In article , Wally wrote: On Wed, 6 May 2015 10:02:29 +0200 (CEST), android wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. I don't own that lens but if I had that problem then I would give those links a good shoot! It is a fast lense in it's class and those might benefit from MFA, if available. Nonsense. Variable focus errors can't be fixed by MFA. Assuming that that is your problem... -- teleportation kills |
#7
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Beware - focus problem with Canon 17-55mm lens
On Thu, 07 May 2015 08:47:01 +0200, android wrote:
In article , Wally wrote: On Thu, 07 May 2015 04:54:08 +0200, android wrote: In article , Wally wrote: On Wed, 6 May 2015 10:02:29 +0200 (CEST), android wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. I don't own that lens but if I had that problem then I would give those links a good shoot! It is a fast lense in it's class and those might benefit from MFA, if available. Nonsense. Variable focus errors can't be fixed by MFA. Assuming that that is your problem... No assumption necessary --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#8
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Beware - focus problem with Canon 17-55mm lens
In article ,
Wally wrote: On Thu, 07 May 2015 08:47:01 +0200, android wrote: In article , Wally wrote: On Thu, 07 May 2015 04:54:08 +0200, android wrote: In article , Wally wrote: On Wed, 6 May 2015 10:02:29 +0200 (CEST), android wrote: Wally Wrote in message: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. https://duckduckgo.com/?q=micro+focus+adjust HTH, or something... Good luck with fixing a variable focus problem with MFA. I don't own that lens but if I had that problem then I would give those links a good shoot! It is a fast lense in it's class and those might benefit from MFA, if available. Nonsense. Variable focus errors can't be fixed by MFA. Assuming that that is your problem... No assumption necessary I would give it a try, if I were you... -- teleportation kills |
#9
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Beware - focus problem with Canon 17-55mm lens
Check out these links in DPReview, where the problem is discussed.
http://www.dpreview.com/forums/post/55657691 http://www.dpreview.com/forums/post/55749574 http://www.dpreview.com/forums/post/55655623 It's an issue that confuses many. People say, there's a problem with the subject that you're focusing on. There's a problem with the camera. There's a problem with your technique. You need to MFA. You need to get the lens-camera system calibrated. There is disbelief that it could be the lens. But it is the lens. W On Wed, 06 May 2015 01:06:27 -0600, Wally wrote: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. The effect is often missed because users tend to stop the lens down when shooting outdoors, increasing the DOF to the point that the distant subject is sufficiently sharp. But when users open up. the distant subject can go blurry, with the focal plane falling in the foreground. The error seems to occur all the time when focusing into the distance in susceptible systems, but the extent of the error varies randomly. Sometimes you will get three or four sharp pictures, followed by a few very blurry results, all taken with the same settings. In my own experience using the lens with my 7D Mark II, about 2/3 of the results are unacceptable when shooting at f/2.8. I also get failures at f/5.6 and other apertures. My lens has shown this autofocus failure on my 40D, XSi, 7D, and now on the 7D2. I have six other Canon lenses, and they all focus fine. So I conclude it is not the body, but the lens. The AF failure never occurs indoors where distances are shorter. And the failure never occurs in live view, whether I am shooting short or long distances. The lens has been to Canon service five times. Each time, they say the lens meets all specifications. And each time, the AF failures continue. Recently I have had an opportunity to test a second copy of the lens, and it behaves exactly the same as my lens. I can't say for sure, but I think all copies have this fault. Some users get consistent sharp results with this lens, though. It seems that the body used affects the behavior. I have found that the lens almost always gives sharp results on my Rebel SL1. Others report that good results are obtained on the 7D, but not the 7D2. The focus issue with this lens is very poorly documented on the Web, but a search in Google will turn up some instances. If you are in the market for the Canon 17-55mm lens, and if the distant-focus issue is a concern of yours, I suggest you test the lens carefully with your body during the dealer's return period to determine if the lens is satisfactory for your intended use. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#10
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Beware - focus problem with Canon 17-55mm lens
Here is another link in another forum that documents the problem with
the 17-55mm lens. http://photography-on-the.net/forum/...1427525&page=1 If you don't own this lens, just ignore these posts. But if you DO own the lens, run a few tests and report back here. - Central AF point only - Zoom at around 28 to 35mm - Wide aperture, f/2.8 is best but 4 and 5.6 also show the problem - Focus on bright, contrasty DISTANT subject - Take several shots with identical settings - Compare on the computer. The problem seems to show up consistently on the 7D2 and also on other bodies, but not on all bodies. My SL1 does not show the focus problem. Check it out and let us know the results. W On Wed, 06 May 2015 01:06:27 -0600, Wally wrote: The much-praised Canon 17-55mm/2.8 lens shows variable autofocus problems when the focus target is in the distance (a city block or so, or farther). This makes the lens a poor choice for general purpose photography. The effect is often missed because users tend to stop the lens down when shooting outdoors, increasing the DOF to the point that the distant subject is sufficiently sharp. But when users open up. the distant subject can go blurry, with the focal plane falling in the foreground. The error seems to occur all the time when focusing into the distance in susceptible systems, but the extent of the error varies randomly. Sometimes you will get three or four sharp pictures, followed by a few very blurry results, all taken with the same settings. In my own experience using the lens with my 7D Mark II, about 2/3 of the results are unacceptable when shooting at f/2.8. I also get failures at f/5.6 and other apertures. My lens has shown this autofocus failure on my 40D, XSi, 7D, and now on the 7D2. I have six other Canon lenses, and they all focus fine. So I conclude it is not the body, but the lens. The AF failure never occurs indoors where distances are shorter. And the failure never occurs in live view, whether I am shooting short or long distances. The lens has been to Canon service five times. Each time, they say the lens meets all specifications. And each time, the AF failures continue. Recently I have had an opportunity to test a second copy of the lens, and it behaves exactly the same as my lens. I can't say for sure, but I think all copies have this fault. Some users get consistent sharp results with this lens, though. It seems that the body used affects the behavior. I have found that the lens almost always gives sharp results on my Rebel SL1. Others report that good results are obtained on the 7D, but not the 7D2. The focus issue with this lens is very poorly documented on the Web, but a search in Google will turn up some instances. If you are in the market for the Canon 17-55mm lens, and if the distant-focus issue is a concern of yours, I suggest you test the lens carefully with your body during the dealer's return period to determine if the lens is satisfactory for your intended use. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
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