Reptiles -shooting through dirty glass

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Russell
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We had a trip to Tropical world in Leeds today, unfortunately all the glass on the reptile enclosures were filthy...I mean really bad. I wasn't even going to bother with shots through them as I thought it would be a waste of time.

anyway I did eventually, and I'm glad I tried, When I got them home and had a look they were a little lacking in contrast but you couldn't actually see the dirt, So seemed worth working with, Anyway a quick tweak and they came out really well.

Another lesson learnt today...don't be put off in this situation...
...but, can anybody tell me the science behind this ? I guess it's something to do with focal length as with shooting through netting ? but I really couldn't believe how little the dirt showed up.

Hosting is playing up atm, so I can't post examples
 
Yeah, it's the same principal as shooting through wire fences at the zoo and also why a dirty lens doesn't always show in a shot, though a dirty sensor will.
 
Examples

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BIG

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BIG

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BIG
 
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