I think you're right about fungus growing between cemented elements. It
reminds me that I was watching a TV show last night which showed a tree
growing out the side of a rocky cliff in an area where there was little
water. Due to caves in the rock which allowed viewing them it was
discovered that the tree's roots were reaching some 435 below ground.
Fungi perhaps have the same sort of tenacity.
Chuck Norcutt
On 3/24/2011 10:46 AM, Ken Norton wrote:
>> It just occurred to me that, if the IR filter is cemented on, then it
>> should also be hermetically sealed against fungi. That would mean...
>> either a poor cementing job or that the fungus was on the inside of the
>> filter when installed at the factory???
>
>
> Chuck, I was thinking the same thing, but two thoughts come to mind.
> First one is that it is pressure fit, not cemented. The second thing
> is that the fungus thrives in the cement used to bond the sensor and
> filters (UV and IR as well as a glass spacer). This may not be all
> that far-fetched as I think we've seen fungus between cemented lens
> elements.
>
> I've got a hankering to try converting one of those fungused cameras to IR.
>
> AG
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