A 2x teleconverter allows you to double the focal length of the lens on your Pentax DSLR.
Teleconverters are small adapters fitted between a camera's mount and a prime (fixed, non-zoom) lens. A 2x teleconverter multiplies the focal length and maximum aperture (widest opening) of the prime lens by a factor of two. For example, it would turn a 50mm lens with an aperture of f/2 into a 100mm telephoto lens with an aperture of f/4. If you often shoot with a prime lens attached to your Pentax DSLR, a 2x teleconverter is a helpful piece of equipment to have in your camera bag.
Instructions
1. Mount the 2x teleconverter onto your Pentax DSLR. Choosing a teleconverter that is manufactured by Pentax is best as it ensures mounting compatibility with the camera body and the prime lens.
2. Screw the prime lens onto the teleconverter.
3. Look through your camera's viewfinder. You should notice about a 2x magnification of the scene before you.
4. Focus the scene using manual or auto focus. A 2x teleconverter will allow you to use both auto and manual focusing techniques.
5. Adjust your ISO (sensor's sensitivity to light) rating and shutter speed accordingly. Remember that a 2x teleconverter will result in one f-stop less of exposure, so you must either increase your ISO rating or decrease your shutter speed to compensate.
6. Remove the teleconverter by first unscrewing the prime lens. Press the small release tab near the bottom of the camera body's mount and unscrew the adapter.
Tags: prime lens, Pentax DSLR, your Pentax, your Pentax DSLR, camera body, focal length, lens with