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Telephoto Lenses with focal lengths longer than 60mm.

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  #16  
Old 18th June 2019
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Re: Zuiko 300mm PRO glitch

The lens does not focus at all? Have you possibly released the focus clutch, by mistake? It happens to me quite often.
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  #17  
Old 18th June 2019
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Re: Zuiko 300mm PRO glitch

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Originally Posted by Bengeo View Post
Yes. I found it was focusing just in front of a bird and so I did some tests and +5 has put it spot on. The 300mm on its own is fine.
Interesting... there should be no front/back focus issues with CDAF. I will test mine and see if the TC makes any difference.
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Old 18th June 2019
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Re: Zuiko 300mm PRO glitch

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Interesting... there should be no front/back focus issues with CDAF. I will test mine and see if the TC makes any difference.

C-AF uses PDAF and that can be variable. But mine also shows the problem using S-AF where it will be using CDAF and it should be OK. But the +5 adjustment doesn't work in S-AF. I need to send it in, but I keep putting it off because I want to use it.
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  #19  
Old 18th June 2019
Olybirder Olybirder is online now
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Re: Zuiko 300mm PRO glitch

I frequently have a similar problem to yours Mark. I see a bird and place the AF target over it but when I half press the shutter button all I see in the view finder is a smudge instead of the bird. Repeating the process doesn't help and all I can do is focus on the ground in front of me and try again. This usually works but often the opportunity has passed by then.

I assumed this was due to poor technique on my part (most likely) or Olympus's rather 'iffy' AF system. I had never considered that it could be a problem with the lens. I look forward to hearing if you can resolve the issue.

Ron
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Old 18th June 2019
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Re: Zuiko 300mm PRO glitch

I did wonder whether the weight of the lens was the problem. It is quite heavy, and perhaps a little difficult to hold it steady whilst trying to focus. The Pany 100-400 is quite light in comparison, and thus easier to hold steady.....

But the lens is good, and worth living with. Just maybe its my holding of the camera / lens is the problem.…..

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Old 18th June 2019
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Re: Zuiko 300mm PRO glitch

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Originally Posted by MJ224 View Post
But the lens is good, and worth living with. Just maybe its my holding of the camera / lens is the problem.…..


Try shooting from a tripod or monopod and see if that improves things.
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