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Telephoto Lenses with focal lengths longer than 60mm.

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Old 15th April 2019
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Zuiko 300mm PRO glitch

Users of the Zuiko 300mm PRO know it has a focus range switch.

It has three ranges, 1.4m to 4m, 1.4m to infinity, and 4m to infinity.

I normally like to use the whole range, ie 1.4m to infinity, as on my wildlife forays, I never know what going to pop up. But I have found the lens does not always find focus, resulting in a few lost photos.

Today, I changed my habit, in so much I chose to use either the 1,4m to 4m for close ups, and 4m tom infinity for longer shots. This resulted in hardly any lost shots.

Thus I am wondering whether my normal choice (1.4m to infinity) has perhaps a physical problem with the slider switch that determines the range.

Any other users have experienced a similar problem?...………..
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Old 16th April 2019
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Re: Zuiko 300mm PRO glitch

I always set it for the range I'm using mostly 4 to infinity but I do sometimes set the limit in the camera 25m to 700m this is for birding as you need all the speed you can get .


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Old 16th April 2019
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Re: Zuiko 300mm PRO glitch

I also set the lens switch to the range I am using. Like you, I find it is slow to focus if you have it set to the full range.
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Old 16th April 2019
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Re: Zuiko 300mm PRO glitch

Like the others I also set the focus limiter to the range I expect to use. It's one of the irritants of the 100-400 that there are only two focus limit options rather than three.
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Old 20th April 2019
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Re: Zuiko 300mm PRO glitch

I usually set it to 4m to infinity, and when needed switch it to 1.4m to 4m. It rarely misses focus.
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Old 21st April 2019
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Re: Zuiko 300mm PRO glitch

I always leave my lens set to the full range, but I use the focus limiter on the body whenever it’s appropriate and I have time. That makes a huge difference when you’ve got a contrasty background that’s reliably far enough behind your moving subject.

When I first got the lens a couple of years ago I spent a bit of time trying out the various slider settings, but never convinced myself my keeper rate was consistently improved by using it. Tesni Ward agrees with that BTW.

It guess it’s possible the position has changed since I tried out the slider, via the various body firmware updates, which might have an influence.
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Old 28th May 2019
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Re: Zuiko 300mm PRO glitch

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Originally Posted by drmarkf View Post
I always leave my lens set to the full range, but I use the focus limiter on the body whenever it’s appropriate and I have time. That makes a huge difference when you’ve got a contrasty background that’s reliably far enough behind your moving subject.
  • I've been experimenting with this focus limiter and the way I use it is like this. I have saved the settings to C2 and C3 (C1 is already allocated to static objects)
  • C2: C-AF, 9 AF points (sometimes 5). No focus limiter. Totally relies on your skills to keep the AF points on the subject.
  • C3: C-AF, all AF points. Focus limiter set to "maximum distance for subject to fill acceptable part of frame". Could be e.g. 50 meters for large subjects, or less e.g. 15 meters for smaller subjects. I use this for fast paced action and less predicatable subjects, avoiding the AF locking on background.
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Old 28th May 2019
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Re: Zuiko 300mm PRO glitch

I always use proper long range/short range switch position, otherwise it focuses quite slow. Canon, Nikon, etc... uses the same approach, it’s normal.
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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

Returning to this thread...……………..

I use my f4 300mm Pro a lot. And like it...…………..

BUT

Compared to my older Pany 100-400mm, the Oly lens quite often misses focus, usually at a vital moment. The Pany is almost faultless...

Have to add that the Oly is connected to the 1.4 TC.

The Oly is pre-loved, so I don't know its full history. Only reason I am airing this again, is that I had a photo session in my garden, and used both lenses...

I guess it might be worth having the Oly serviced...……

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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

Quote:
Originally Posted by c12402 View Post
I always use proper long range/short range switch position, otherwise it focuses quite slow. Canon, Nikon, etc... uses the same approach, it’s normal.
Hi,

The lens has been tested for traveling the whole range (close focus to infinity or the other way around) at times around 0.5... 0.6s I wouldn't call that "quite slow". I agree though that the focus limiter is a best practice, in some situations 1/10 makes the difference between a great photo and a mediocre one...
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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

Quote:
Originally Posted by MJ224 View Post
Returning to this thread...……………..

I use my f4 300mm Pro a lot. And like it...…………..

BUT

Compared to my older Pany 100-400mm, the Oly lens quite often misses focus, usually at a vital moment. The Pany is almost faultless...

Have to add that the Oly is connected to the 1.4 TC.

The Oly is pre-loved, so I don't know its full history. Only reason I am airing this again, is that I had a photo session in my garden, and used both lenses...

I guess it might be worth having the Oly serviced...……


My 300 has been rock solid. I almost always have the teleconverter on.
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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

Quote:
Originally Posted by MJ224 View Post
Returning to this thread...……………..

Have to add that the Oly is connected to the 1.4 TC.

Check for front / back focus. Mine needs +5 adjustment with the TC.
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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

+5, meaning it front-focuses?
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Old 17th June 2019
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Re: Zuiko 300mm PRO glitch

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Originally Posted by Tordan58 View Post
+5, meaning it front-focuses?

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

Quote:
Originally Posted by MJ224 View Post
Returning to this thread...……………..

I use my f4 300mm Pro a lot. And like it...…………..

BUT

Compared to my older Pany 100-400mm, the Oly lens quite often misses focus, usually at a vital moment. The Pany is almost faultless...

Have to add that the Oly is connected to the 1.4 TC.

The Oly is pre-loved, so I don't know its full history. Only reason I am airing this again, is that I had a photo session in my garden, and used both lenses...

I guess it might be worth having the Oly serviced...……

Maybe I am using the wrong words here. The Oly lens just does not focus making a photo a waste of time. Not always, I just thought it was the subject that the camera and lens were pointed at. But the Pany lens is almost faultless....
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