pentax lens

The 2X teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2X and will cut back the amount of light by 2 f/stops.

K1.5 AF SHQ DG converter - A Macro and Telephoto Accessory Placed between the camera body and lens, a teleconverter contains a set of optics that will effectively increase the ...

The 1.5x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.5x and will cut back the amount of light by one f/stop.

The 2X tele-converter (also known as a tele-extender) will multiply the focal length of the existing lens by 2X and will cut back the amount of light by 2 f/stops.

- AF 2X Telephoto for Pentax.