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The Pentax smc FA 645 300mm f/4 ED (IF) lens is now $1,500 off at B&H Photo. All other currently discounted Pentax lenses can be found here. A modified smc PENTAX-DA ★ 300mm f/4ED [IF] SDM lens was installed in the 6U CubeSat Kitsune satellite for high-resolution photos and sent to space