Hi, The Pentax bellows system uses a double ended cable release to trip the shutter and close the diaphragm of the special bellows lens. This allows you to compose and focus, then take the picture without disrupting the setup and at the moment decided by you.
On a camera without a cable release socket, or if you use a "normal" lens, this system will not work. You have to compose and focus with the lens wide open (for ease) and then close down to take. There is the possibility that this procedure could introduce errors of focus or composition. It is also more invasive to subjects which may be disturbed, such as insects. mike
