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05-31-2010, 06:29 PM   #1
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white round spot on the lens glass?

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Size:  52.4 KBHi I just found a round spot on the lens glass on my 18-250. I want to know what is this? It does not affect the images that I have taken. I had these also on my da40 lens. Sadly I wasnt able to call pentax regarding this matter, as Ive forgot to call them before the warranty on my DA 40 lens expired. Now this happaned again, I still have till september to call before the warranty expires on my DA 18-250. Any suggestions? I would like to know if this is also covered by the warranty?

05-31-2010, 07:46 PM   #2
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If it wasn't there when the lens was new, it's not likely going to be covered by the warranty.
I presume you have checked to see if it's something stuck to the glass that can be cleaned off?
05-31-2010, 09:30 PM   #3
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try cleaning it with lens cleaning solution. Use UV filter from now on all your lenses to prevent this. It does not look like damaged coating, more like a toothpaste drop
06-01-2010, 11:29 AM   #4
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As kytra said, definitely try a wet cleaning.

I had many spots on the front element of my Sigma 24-60, and I thought they represented some kind of damage. Neither a soft wipe nor a LensPen made any difference. But with some lens cleaning solution, they disappeared entirely!

06-01-2010, 06:55 PM   #5
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thanks for all of your advise. I will buy a lens cleaning solution, hopefully it will work.
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