October 23, 2014, 04:24:50 PM

Author Topic: 300 f/2.8L and 400 f/2.8 at f/2.8  (Read 13812 times)

bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #75 on: April 28, 2013, 06:35:29 PM »
Thanks for the help.  I used my 300 today because I just couldn't risk it, as I didn't have time to do any testing.  I simply picked two locations during the day where there was a green, next to a tee, luckily the cart path turning 90 degrees to the right after the green.  So I was okay and just had to give up on fairway shots.  I'm going to test it, because I have track next weekend and really need that lens for that.
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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #75 on: April 28, 2013, 06:35:29 PM »

bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #76 on: May 02, 2013, 09:53:01 PM »
I tested the lens today and that was the problem.  Sharpness is restored corner to corner.  Thanks so much for the help.
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Hannes

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #77 on: May 03, 2013, 07:41:42 AM »
It is a bit worrying that your lens mount came loose like that. It'd probably be worth talking to CPS about it whether they want to have a look at it to stop it from doing it again. For anything other than a several thousand dollar lens I'd advocate loctite

bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #78 on: May 03, 2013, 11:30:51 PM »
Since I'm a CPS member, I went ahead and contacted them and yes, the lens mount needs replaced, and after it's replaced, a full set of specs will be run to make sure it's operating as it should.  So when I get it back, it should be back to near original condition.  I have no idea what I did to loosen it.
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CarlTN

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #79 on: May 06, 2013, 05:22:37 PM »
Interesting!

bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #80 on: May 23, 2013, 06:52:42 PM »
Just to give an update, the lens goes to Canon tomorrow under CPS gold membership.  I'll let you know what they find, but the guy was pretty adament about sending it in and the mount needing replaced asap.
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #81 on: May 24, 2013, 08:18:58 PM »
It's on the bus to New Jersey  8)

J/k, I'll stop.
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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #81 on: May 24, 2013, 08:18:58 PM »

privatebydesign

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #82 on: May 24, 2013, 09:25:16 PM »
Personally I think the man is an idiot. I am certain there will be nothing else wrong other than the screws worked loose. I am sure when they bench test it they will find any number of things that need replacing, they have done it to me on several occasions, but as far as I am concerned if the lens works and isn't decentered it is fine with me.

But if you want the peace of mind it is worth it for yourself. Just look at any service advice they give you with open eyes.
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #83 on: May 24, 2013, 09:51:54 PM »
@PBD,

They keep coming loose.  I cannot make them stop coming loose after I shoot all day and then take off the camera.  I cannot keep combating that.
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Northstar

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #84 on: May 24, 2013, 10:05:07 PM »
@PBD,

They keep coming loose.  I cannot make them stop coming loose after I shoot all day and then take off the camera.  I cannot keep combating that.

That sucks bdun....did u buy it new or used?
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #85 on: May 24, 2013, 10:07:56 PM »
I bought it used last summer.  I shot a ton with it last fall, and this spring, and only had this happen about 3-4 weeks ago.  No idea what happened.
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #86 on: May 24, 2013, 10:22:49 PM »
Sorry, here's the one I wanted.  Looks back-focused to me:
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #87 on: June 01, 2013, 03:50:13 PM »
They replaced the entire lens mount, along with the entire focusing assembly.  It works really awesome now, much faster.  Apparently the screws couldn't go into the barrel anymore, and everything was loose.  According to the paperwork, they checked back/front focusing and everything passed QC specs.  Looks like it's good to go.
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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #87 on: June 01, 2013, 03:50:13 PM »

serendipidy

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #88 on: June 01, 2013, 05:01:24 PM »
They replaced the entire lens mount, along with the entire focusing assembly.  It works really awesome now, much faster.  Apparently the screws couldn't go into the barrel anymore, and everything was loose.  According to the paperwork, they checked back/front focusing and everything passed QC specs.  Looks like it's good to go.

Glad everything worked out well for you :)
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bdunbar79

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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #89 on: June 01, 2013, 10:30:45 PM »
Thanks!   :)

As you might imagine, something that expensive not working correctly can be stressful.
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Re: 300 f/2.8L and 400 f/2.8 at f/2.8
« Reply #89 on: June 01, 2013, 10:30:45 PM »