Pentax PK Mount Teleconverters

K eep teleconverters in mind when selecting lenses for your Pentax camera. 2X teleconverters are more popular and powerful. 1.4X teleconverters are more useful and often have less distortion too. 3X teleconverters are rarely used anymore, as they have so much image degrading effect as to be worse than simply enlarging a smaller image. Teleconverters work much better on telephoto lenses (200mm and up) than on shorter focal length lenses and typically work better on prime lenses than on zoom lenses. With a 1.4X teleconverter, you lose a stop of light. So an 135 f/2.8 lens becomes the equivalent of a 190mm f/4. A 200mm f/4 becomes a 280mm f/5.6 equivalent. With a 2X teleconverter, your 135mm f/2.8 becomes 270mm f/5.6 and your 200mm f/4 is a rather slow 400mm f/8 equivalent. You can also convert your 50mm f/1.8 into a 100mm f/3.5 using a 2X. teleconverter
Teleconverters for Pentax DSLR Cameras
Sigma APO Teleconverter 1.4x EX DG for Pentax Mount Lenses
Sigma APO Teleconverter 1.4x EX DG
for Pentax Mount Lenses
Sigma APO Teleconverter 1.4x EX DG for Pentax Mount Lenses. The Sigma APO Teleconverter 1.4x EX DG for Pentax Digital SLR Cameras is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length by the power of 1.4. The multi-layer coating reduces flare and ghosting, which is a common problem with digital cameras. The lens also offers maximum magnification without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter can convert your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork. A case for the lens is included.

Sigma APO Teleconverter 2x EX DG for Pentax Digital SLR Cameras
Sigma APO Teleconverter 2x EX DG for Pentax
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Sigma APO Teleconverter 2x EX DG for Pentax Digital SLR Cameras. The Sigma APO Teleconverter 2x EX DG for Pentax Digital SLR Cameras is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the focal length by the power of 2. The multi-layer coating reduces flare and ghosting, which is a common problem with digital cameras. The lens also offers maximum magnification without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter can convert your lenses into longer focal-length lenses, so you don't have to do a lot of unnecessary footwork. A case for the lens is included.

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