Ricoh Unveils a New 100mm f/2.8 Macro Lens for Pentax DSLRs | PetaPixel
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カメラの八百富|SMC PENTAX -A MACRO 100mm F2.8 - 中古カメラご一行様(by八百富写真機店)
The smc Pentax-M 100 mm f/ 2.8 Lens. Specs. MTF Charts. User Reviews.
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Venus Optics' 100mm F2.8 Ultra Macro lens is now available with Pentax K mount, new stepless EF mount version also available: Digital Photography Review