Sigma 150-500 bayonet q'ion

LauraJ23

LauraJ23

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Just wondering if someone could take a look at the bayonet of their 150-500 and tell me if there is a screw that sticks out a little, see attached pic. My brothers lens is a Sony alpha mount and it keeps showing 2 dashes and no aperture when on camera and being held, there is play in the bayonet when attached but I believe that is a quirk of the lens. I am just wondering if the screw in the pic is actually meant to be like it is. IMG_20180519_205836~01.jpeg
 
No screws sticking out on my Nikon mount.

I take it you’ve tried screwing it back in, sorry can’t be more helpful.
 
I don't have that lens but my observation is:-

1) such cheese head screws can be used as, so to speak, bump stops/travel limiters i.e. the screw head is designed to stand proud and perform a function other than joining one item to another.
2) from your picture it looks like the exit point of the screw is in 'thin air' (going into nothing other than the metal on the flange). If inspected I surmise you will see that it flush with, or as close to flush as putting something with a flat surface into a radius curve, the inner surface.

In other words the lens is normal!

The error is related to something else. Did the lens perform ok before or is this a secondhand lens being used on a new camera.....I have read that some sigma lenses don't place nice on newer (Canon) bodies and need re-chipping to make them compatible with the newer bodies. Perhaps the same situation with a Sony???

Edit ~ though not the same mount (looks more like a Canon) if you zoom in on this image you can see the same screw.

https://goo.gl/images/iu7ENC
 
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Box Brownie said:
I don't have that lens but my observation is:-

1) such cheese head screws can be used as, so to speak, bump stops/travel limiters i.e. the screw head is designed to stand proud and perform a function other than joining one item to another.
2) from your picture it looks like the exit point of the screw is in 'thin air' (going into nothing other than the metal on the flange). If inspected I surmise you will see that it flush with, or as close to flush as putting something with a flat surface into a radius curve, the inner surface.

In other words the lens is normal!

The error is related to something else. Did the lens perform ok before or is this a secondhand lens being used on a new camera.....I have read that some sigma lenses don't place nice on newer (Canon) bodies and need re-chipping to make them compatible with the newer bodies. Perhaps the same situation with a Sony???
Click to expand...
Good point there it could well be normal, i thought I'd check with other uses. , it used to work fine, he's had it ages and it's the same body. It's gotten worse over the last few weeks
 
michael23 said:
Good point there it could well be normal, i thought I'd check with other uses. , it used to work fine, he's had it ages and it's the same body. It's gotten worse over the last few weeks
Click to expand...

I edited my post at the same time as you quoted me.......do have a look at the image I found that IMO clarifies it for you.

Edit~ gradual deterioration makes me wonder if there is corrosion (?) on the terminals. Maybe give them a clean? Note ~ never had the need to do it but recall reading that a gentle use of an eraser can do the job.......being careful to make sure the 'rubbings dust' does not get left on the lens or in/on the cam!
 
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Box Brownie said:
I edited my post at the same time as you quoted me.......do have a look at the image I found that IMO clarifies it for you.

Edit~ gradual deterioration makes me wonder if there is corrosion (?) on the terminals. Maybe give them a clean? Note ~ never had the need to do it but recall reading that a gentle use of an eraser can do the job.......being careful to make sure the 'rubbings dust' does not get left on the lens or in/on the cam!
Click to expand...
Thanks for finding the image, I shall have a look later as I'm on my phone and it won't load up.
 
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