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Occasional faint metallic sound with EF 100-400mm mk II while focusing

Started 9 months ago | Discussions thread
Mika Y.
OP Mika Y. Senior Member • Posts: 2,135
Re: Occasional faint metallic sound with EF 100-400mm mk II while focusing

amm wrote:

Hello Mika,

I have quite a few Canon telephotos including 100-400 mm ii, no metallic sound from any of them that I can recall while focusing. By the way, there is a new firmware for 100-400 mm ii on canon website, in case you have not updated yours. It was suggested that the new firmware prevented IS from random jumping (although you had mentioned based on your observation that the noise is not IS related). One never knows what other issues may have been addressed in firmware updates.

Oh, seems that I have missed the existence of the firmware update, thanks for the tip! No harm in applying it just in case anyway.

 Mika Y.'s gear list:Mika Y.'s gear list
Canon EOS Rebel T4i Canon EOS 5D Mark IV Canon EOS R7 Canon EF 50mm F1.4 USM Canon EF-S 10-22mm F3.5-4.5 USM +13 more
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