This tele converter doubles the focal length of the lens attached at the expense of two stops of light loss.
The T6-2x was the earlier 2x converter, black in color, and is comprised of 6 elements in 6 groups. It is designed specifically for telephoto lenses. According to Pentax it is optimized for use at near infinity distances. Refer the table below regarding lens compatibility and check before use if the front element will touch the rear element of the lens.
It supports inner bayonet as well as outer bayonet lenses.
Notes
Engraved name: REAR CONVERTER T6-2X User reviews Black finish. Designed for telephoto lenses, optimized for use at near infinity distances. The converter supports all exposure modes of the attached lens. The converter supports lenses 135mm and up with inner as well as outer bayonets with a few known exceptions: The 165 mm LS lens, the 500 F5.6 and the 1000mm F8 lenses are not supported. There may be other exceptions.
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