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Old Jun 27, 2007, 10:02 PM   #1
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I have a Tamron 24-135 and underneath the front lens on the inside is two specks of dust. Now it's not underneth front lens but on the glass below the front lens underneath. Tamron wanted $150.00 to clean.
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Old Jun 28, 2007, 6:11 AM   #2
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How old is it? How much is a new one? Personally, if it's not affecting your photos I' d leave it alone.
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Old Jun 28, 2007, 8:53 AM   #3
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By all accounts, the Tamron 24-135 is a fine lens. Right now, it's selling for $400 minus a $100 rebate. Paying $150 to have it cleaned sounds a lot better than buying a new one.

Another point I want to make is that, when you have a lens professionally cleaned, in addition to being cleaned, it is also likely to be optically better than it was before you sent it in, and better than a new lens. That's because the technician took the time to realign the optics when reassembling the lens.

Of course, optically, aside from the dust, the lens might already be as good as it can be, but getting a trained technician with the appropriate tools and test equipment to take another look at it is never a bad idea.

Unless they lose it. In which case you may get a new one for the cost of the cleaning.
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Old Jun 28, 2007, 10:07 AM   #4
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Just a couple of specs of dust on the front lens element won't affect the image at all.
They may just be annoying to you since you know they are there.

If there is a lot of dirt building up on the front element the lens will start to go soft and lose contrast, but the specks of dirt themselves will not show up in the images.

Unlike dirt on the sensor which does show up on the images.

Peter.
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Old Jun 28, 2007, 12:03 PM   #5
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PeterP wrote:
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Just a couple of specs of dust on the front lens element won't affect the image at all.
They may just be annoying to you since you know they are there.

If there is a lot of dirt building up on the front element the lens will start to go soft and lose contrast, but the specks of dirt themselves will not show up in the images.
Ditto.

If the dust isn't affecting your photos, don't worry about it.
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Old Jun 28, 2007, 5:21 PM   #6
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Thank you everybody for the info.
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