| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4428 |
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I heard that it's more about the reflectivity of the coating used on the rear element of certain lenses. Specific coatings reflect IR light better than others. Coatings that reflect it very well are more efficient at creating hotspots.
It's those naughty nanos again!
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Eric