----- Original Message ----- From: "John Whittingham" Subject: Confused! please help - 645 75mm 2.8 LS
> OK I'm reading through the literature on the 645 I bought (no manual) and I > really fancy a leaf shutter lens 75mm f2.8 LS and it says that it can be used > with flash sync up to 1/500 sec. and may be used in manual mode. GREAT!! > > However when the LS is attached to the camera the focal plane shutter is set > auto at 1/8 sec. So I figure, yes well there's a shutter in the lens, isn't > there? (I've never even seen one!) > > So how do you set the shutter speed above 1/8 sec., on the lens? > > Could it be synchronized with say a Metz 45 CT-4 and SCA adapter if I had the > lead from the lens to the hotshoe? > > Or would everything be totally manual? (I'll dig out my Western Master V!!! There is a shutter in the lens. It is actuated by the stop down lever when the focal plane shutter is tripped. The 1/8 second shutter speed (this is very important, do not use the leaf shutter at focal plane speeds other than 1/8 second) allows enough time for all the mechanical dreck that has to happen. There is a shutter speed dial on the lens as well as a shutter cocking dial. I don't think it possible to use a leaf shutter lens with TTL auto, although I could very well be wrong. The flash has to plug into the PC socket on the lens, and of course, you have to put an adaptor onto the hot shoe to get TTL flash. Your Metz 45 is probably more accurate in automatic than your Pentax 645 is in TTL anyway. Also, don't change the shutter speeds on the lens after the shutter is cocked. Very bad. William Robb
