topic Re: Canon 600mm F4 lens lock knob falls out in EF & RF Lenses

Canon 600mm F4 lens lock knob falls out

Sborg — Fri, 05 Jan 2024 14:37:05 GMT

I recently bought a the subject lens second-hand and I'm missing the retaining washer. As a result, the lock knob (the little piece of metal that butts up against the lens to hold the hood in place) frequently falls out as I'm putting the hood on or off. Has anyone else had this problem? I've ordered the washer but would like hear if any other users have had the problem and have any tips for inserting the washer into the lock knob. Thanks.

Re: Canon 600mm F4 lens hood problem

shadowsports — Fri, 05 Jan 2024 00:07:59 GMT

Greetings,

A few pictures might be helpful. Since you have a replacement washer on the way, what about using a small plastic or metal retention washer to hold it in place?

Possible?

Re: Canon 600mm F4 lens hood problem

Sborg — Fri, 05 Jan 2024 00:59:33 GMT

Two views of the knob lock.

Re: Canon 600mm F4 lens lock knob falls out

ebiggs1 — Fri, 05 Jan 2024 15:26:23 GMT

Its been so long since I had my 600mm lens out I have forgotten how the hood attaches but I don't remember it ever falling off. And, I carried it all over Colorado and the southwest United States for years on many photo trips there. Up and down mountains, rain and snow, in the deserts, just about everywhere.

Re: Canon 600mm F4 lens lock knob falls out

Sborg — Sat, 06 Jan 2024 01:09:54 GMT

I'm guessing you still have the retaining washer in place.

Re: Canon 600mm F4 lens lock knob falls out

ebiggs1 — Sat, 06 Jan 2024 18:34:39 GMT

Probably so, the last time I remember using it was out in Mesa Verde carrying it all over the place. I really stopped using it when I got the Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens.

Re: Canon 600mm F4 lens lock knob falls out

Canonoli — Mon, 08 Jan 2024 14:05:48 GMT

I just replaced mine. You need to get a 2mm e clip, and it slips into the knob spindle that goes into that wedge you show a photo of. You can use tweezers and a small screw driver to push it in. You can purchase a whole set of e clips of Amazon for as little as ten dollars.

Re: Canon 600mm F4 lens lock knob falls out

Sborg — Mon, 08 Jan 2024 17:57:46 GMT

Thank you!

Re: Canon 600mm F4 lens lock knob falls out

Sborg — Sun, 14 Jan 2024 00:43:21 GMT

I'm not familiar with e clips but I gather that the spindle should be inserted into the lock knob (wedge in the photo) and then the e clip fitted on. Correct? Thanks.

Re: Canon 600mm F4 lens lock knob falls out

Sborg — Wed, 17 Jan 2024 02:23:54 GMT

It worked. I put the e clip in place with tweezers, applied a little pressure with my finger and it slipped on. Thanks!

Re: Canon 600mm F4 lens lock knob falls out

Anton2 — Fri, 08 Nov 2024 06:22:40 GMT

Hi, I have the same problem and read about the solution that is mentioned above. But I don't completely understand the text, because English is not my native language. Can you explain the e clip slips on? Maybe you can send a photo of it?

Re: Canon 600mm F4 lens lock knob falls out

Sborg — Fri, 08 Nov 2024 08:02:56 GMT

The e-clips are shaped like horseshoes. If you hold it with a pair of tweezers, you can force the open end onto the shaft of the screw, as Canonoli stated. You'll need 2x5 mm clips. Attached is a picture of the assembly. The arrow points to the e-clip after I pushed it onto the shaft. Am also attaching a picture of the e-clips. You can buy them from Amazon.

Re: Canon 600mm F4 lens lock knob falls out

Peter — Fri, 08 Nov 2024 09:51:46 GMT

Thanks!

I have ordered too for my EF800 and EF300.

Re: Canon 600mm F4 lens lock knob falls out

Anton2 — Tue, 12 Nov 2024 07:31:41 GMT

Thank you for the extra information and photo's.

Re: Canon 600mm F4 lens lock knob falls out

Peter — Wed, 13 Nov 2024 10:21:30 GMT

Done. Took me 20 minutes to get it right.