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Sigma contemporary lenses harder to mount?

CharlesH

LMF-Patron Gold
I'm having a problem mounting some Sigma contemporary lenses. I have the following four lenses: 17mm, f/4. 20mm, f/2. 24mm, f/3.5. 45mm, f/2.8. And I've had a mounting issue with the 24mm and the 45mm.

All these lenses are ideal with the S9, they are small with a manual aperture. I've been using these with the S9 as I learn about that camera. They all have a fairly stiff mount with my S9. But the 45mm became harder and harder to twist on as I used it, and it was very difficult to remove the more I used it. The 24mm seemed to be headed in this same direction. I've not used the 17mm and 20mm nearly as much. I can't see any obvious wear or scratching around either the 24mm or 45mm lens or the camera mount. In the mean time all my Panasonic Lumix lenses continued to mount smoothly on the S9, with no issues. I don't have the precision measuring tools I would need to see if there is any difference in the lens mount dimensions between these Sigma contemporary and Lumix lenses. Notably these same Sigma lenses mount on my S5II okay; albeit just a little stiffer than my Lumix lenses.

I finally returned the S9 to B&H for exchange, thinking there is a problem with my S9 lens mount. So I don't have a S9 right now, waiting to see how quickly B&H can do an exchange

I'm continuing to work with these four lenses with the S5II. And it seems like the 24mm is getting harder to mount on the S5II as I use it. While not as sever as with the S9, this is starting to concern me.

So I have these questions:

Has anyone noticed Sigma contemporary are stiffer to mount than Lumix lenses?

Has anyone noticed some Sigma contemporary lenses can become harder to mount and remove the more they are used?

Could this just be an isolated issue with my S9?

Does anyone understand why Sigma contemporary lenses might have a tighter mounting than Lumix lenses?

Does anyone have a solution to get these Sigma contemporary lenses to mount more smoothly?

Help. Z02 Zek
 
I have the Sigma 35mm f/2 and 45mm f/2.8 and both are a slightly tighter fit on my S5II than my Lumix zoom lenses. My Lumix 50mm f1/8 is a bit tight too although being larger seems to make it a bit easier to turn.

I've got the 24mm f/3.5 and 90mm f/2.8 on backorder, probably a few weeks before I have them. I hope they're not a problem to mount!
 
I never payed attention to this, so I think the difference seems to be not that big on my S5ii. Otherwise I would have realized it.

But I will check later when I am back at home.
 
I never noticed with my 16-28.. It's a good fit on my S5iiX (never tried it on my S5 i think)
 
i have the Sigma 45mm and use it primarily with the S9.
it is slightly tighter than the Lumix lens, but the difference is not enough to alarm me
 
I remember lenses are a bit harder to mount on a brand new camera (happened with my S5 and Pentax K-3) but it goes away after a couple of days of use.

I've owned five Sigma contemporary L-mount lenses and all mount smooth as silk on my S5.

If they previously mounted well on a different camera then it's very likely that the mount on your S9 is slightly deformed in some way.
 
They all have a fairly stiff mount with my S9. But the 45mm became harder and harder to twist on as I used it, and it was very difficult to remove the more I used it. The 24mm seemed to be headed in this same direction.

That is very strange

Notably these same Sigma lenses mount on my S5II okay; albeit just a little stiffer than my Lumix lenses..... // ......I'm continuing to work with these four lenses with the S5II. And it seems like the 24mm is getting harder to mount on the S5II as I use it.....

This sounds for me that something is wrong with your 45 and 24mm lens.


In the mean time all my Panasonic Lumix lenses continued to mount smoothly on the S9, with no issues.

Therefore the S9 can not be the problem.
 
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