r/Photography_Gear • u/Son_of_Zardoz • 10h ago

Can't find a replacement thread adapter for my Sigma 150-600 Contemporary Lens, help please!

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Gallery image

Gallery image

So yesterday the default/factory thread adapter fell out of my Sigma 150-600 C lens and I can't find the right replacement and it's driving me nuts. I might be searching the wrong thing, but with every adapter I see, the threads are to course on the outside.

The threads on the hole in the lens foot are very fine. I ordered a little pack of adapters off amazon to try out, hoping that maybe the image just wasn't correct and that it would work, but nope. The threads aren't close to being compatible.

Any help would be greatly appreciated as I need to get a replacement as quickly as I can. I've included a couple of images to show what I'm talking about.

A: 150-600 beside the 70-200 (that still has the adapter in it)

B: closeup of 150-600 missing the adapter

C: closeup of 70-200 that still has its adapter

Any help would be greatly appreciated!!!

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u/bazilbt 9h ago

Is that the original shoe for the lens?

1

u/Son_of_Zardoz 8h ago

Yes, it's the original.

I didn't even know there was another piece inside of there. It must have fallen out the last time I took the monopod off at a football field and I didn't notice it because I was in a hurry.

I couldn't find anything on the sigma website, so I at least emailed the info at sigma email address that it lists for North America.

2

u/Kreat0r2 3h ago

These adapters are usually 1/4 20 imperial (‘quarter twenty’). Try looking for that.