File:Aspheric.planar.convex.lens.png - Wikimedia Commons
![Tamron 171D AF 28-200mm F3.8-5.6 IF for Pentax PK As-Is [703608] Used 725211187141 | eBay](https://i.ebayimg.com/images/g/22YAAOSwyalkFobb/s-l1600.jpg "Tamron 171D AF 28-200mm F3.8-5.6 IF for Pentax PK As-Is [703608] Used 725211187141 | eBay")
Tamron 171D AF 28-200mm F3.8-5.6 IF for Pentax PK As-Is [703608] Used 725211187141 | eBay
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