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Double the effective reach of your Pentax K-mount lens with this 2x Manual Teleconverter from Bower. Featuring fully manual operation and a 2x magnification factor, this optic can improve the versatility of your legacy lens collection or just enhance the capabilities of your camera. It is a fully manual option and reduces light transmission by 2 stops. Additionally, it is optimized for use with longer telephoto primes and zoom lenses.