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58mm 2X Telephoto Lens Tele Converter for Nikon Sony Pentax 18-55mm G5L4L4 4894829158426 | eBay
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500mm f/8 Telephoto Lens (T Mount) with 2x Teleconverter (=1000mm) for Pentax K-S1, K-500, K-30, K-50 - Walmart.com
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