Pentax 6×7 Extension Tube Set
In combination with a lens equipped with an outer bayonet (600 to 1000mm), this extension tube set allows close-up work at various magnifications. The two available tubes can be used independently or together.
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Pentax 6×7 Auto Extension Tube Set
For close-up work, this auto extension tube set is mounted between the lens (45 to 300mm) and the camera body and can be used singly or in any combination. With a 105mm f/2.4 standard lens, its three-tube setting offers a magnification up to 1.07x. Auto diaphragm operation is retained.
Pentax 645 Auto Extension Tube Set
The auto extension tube-A 645 set, offers three tubes of different lengths, used independently or in any combination (13.3mm-79.8mm) for magnifications of 0.35x-1.22x with the 75mm f/2.8 lens or for a maximum magnification of 2.57x with the 55mm lens mounted in reverse.