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Canon EF 400 f/2.8L IS Lens Hood Tightening
Dennis Wierzbicki, Photographer
Chicago | IL | USA | Posted: 9:39 AM on 08.13.16
->> Hey there. Over the years, the lens hood on my Canon EF 400 f/2.8 L IS has gotten looser and looser, to the point where it's now difficult to keep the hood affixed to the lens. The knurled knob that drives the locking mechanism up and down to engage with the ring around the end of the lens doesn't seem to go deep enough into the ring any longer. The knob has a hole in it. I thought there might be a tiny tiny set screw in there, but you can look straight through the hole to the other side. I also thought maybe the set screw had fallen out, but the know is still firmly attached to the shaft.

Anyone know how to adjust this puppy?

Thanks in advance.
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Jim Pierce, Photographer
Waltham | MA | USA | Posted: 5:58 PM on 08.13.16
->> Dennis,

I recently had a similar problem and did not address it and lost the part that goes in and out and engages with the lens and locks it in place. This piece in my case black is held there by a retaining ring AKA C-Clip. This might be the issue, it is either lose or gone missing.

Remove the entire assembly by removing the two small screws on the inside of the hood. the entire assembly should come out and you can see the C-Clip in the rectangular opening in the part that goes in and out. My guess is you won't. You can buy these and replace it.

I did not know this and actually lost the tab (black piece) that locks to the lens hence had to buy the entire assembly which was not cheap $130 or so.

PM me and I can send a photo if needed.

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Marvin Gentry, Photographer
Birmingham | AL | USA | Posted: 7:34 PM on 08.13.16
->> I have the same issue! thanks for the info
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Paul DiSalvo, Photographer
Highlands Ranch | CO | United States of America | Posted: 8:38 PM on 08.13.16
->> There used to be a SS member that was selling a replacement kit for these. I think it was a retro fit that improved the original design. I tried searching for the thread but it came up empty. There was a bad link to an old classified from someone named Mark Goldman?? Maybe someone else remembers ??
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Kevin Novak, Photographer, Assistant
Panama City Beach | FL | USA | Posted: 8:27 AM on 08.14.16
->> It is Mark Goldman (Goldmine Photography), but the parts are for the Nikon hoods.

I purchased a kit from him and it works like a charm.

Here's the link for others if interested.
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Duane Burleson, Photographer
Sterling Heights | MI | USA | Posted: 8:50 PM on 08.14.16
->> Dennis,

I looked at my lens hood knob and i believe what holds the knob to the shaft is a tiny spring roll pin - it looks like this - which you should be able to see through. No set screw. Your problem is probably the "wedge shaped" aluminum end that pushes into the groove around the barrel. Remove the two screws from inside the hood and take the assembly out and take a good look at it. A tiny "c" clip (2mm) holds the wedge to the shaft.

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Romeo Guzman, Photographer
Orlando | FL | United States | Posted: 8:31 AM on 08.16.16
->> Dennis

Had this problem back when I had my 400, found the clips at an R/C hobby store, only place that had them small enough to fit the gap.
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Steven E. Frischling, Photographer
New England | | | Posted: 1:54 PM on 08.17.16
->> I had this with my 400f2.8 before I sold it. I took it to a machine shop who installed a screw though a new hole, removed the original mechanism. Cost me $25.
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Thread Title: Canon EF 400 f/2.8L IS Lens Hood Tightening
Thread Started By: Dennis Wierzbicki
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