Lens2scope , 7mm wide angle, for Pentax K lenses, black, angled eyepiece
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The best lenses for Pentax K-3: Recommended wide angle, telephoto and standard lenses - DXOMARK
C-mount - Pentax K-Mount Camera Lens Adapter | Edmund Optics
35mm F1.4 AF Full Frame High Speed Wide Angle (Sony E) – Rokinon
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