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04-06-2011, 08:57 PM   #1
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Can anyone tell me what this ring on Tamron lens is?

I just bought a new Tamron zoom lens for pentax online. When I opened the box, the lens looked in good condition, but there was a coin size black ring slipped off when I opened the lens back cover. See the photos. When I checked the ring carefully, there was a tooth( a small tab) was broken on the edge of the ring.
Without this ring, my pentax kx works normal when the tamron lens mounted. At least I don't see anything wrong at first dozens shoots.
Can anyone tell me what this ring is? Is my lens good copy? thanks

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04-06-2011, 09:20 PM   #2
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This is what my Tamron 17-50 looks like. Perhaps it is the inner ring seen around the rear lens element here?

04-06-2011, 09:40 PM   #3
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QuoteOriginally posted by gebco Quote
This is what my Tamron 17-50 looks like. Perhaps it is the inner ring seen around the rear lens element here?
Thanks. It looks like a inner ring you said. What's the function of inner ring? What will happen if without inner ring? I shot some test photos, although I didn't feel difference, I guess the ring is necessary otherwise Tamron doesn't place it there. Does anyone know?
04-06-2011, 09:47 PM   #4
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QuoteOriginally posted by looktime Quote
Thanks. It looks like a inner ring you said. What's the function of inner ring? What will happen if without inner ring? I shot some test photos, although I didn't feel difference, I guess the ring is necessary otherwise Tamron doesn't place it there. Does anyone know?
The ring might be just a protector for the rear mount during shipping??? If you have concerns give Tamron an email with pic of the ring....I`m sure they can advise you..
best of luck!

04-07-2011, 01:43 AM   #5
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That's strange. Nothing like that came with mine.
04-07-2011, 04:51 AM   #6
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QuoteOriginally posted by looktime Quote
Thanks. It looks like a inner ring you said. What's the function of inner ring? What will happen if without inner ring? I shot some test photos, although I didn't feel difference, I guess the ring is necessary otherwise Tamron doesn't place it there. Does anyone know?
Clearly you should consult Tamron. From the look of it I'd say it might serve as a "light sponge" to prevent stray reflection off the metal elements. Does it fit into the rear of the lens?
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