Interesting test you got there, Alin. Just tried it out with my Z-1, and I think it's possible to do with the Z-1/p too. Here's my method:
Make sure you have no film in the camera. Turn the f-stop ring to A. Dial in M-bu mode, and select an aperture with the rear dial (eg. f/11). Trip the shutter, and keep it pressed. Watch the aperture blades while you... Turn the f-stop ring from A towards the stop you selected with the dial. When you turn beyond the selected aperture, the diaphragm opens more. Turn the f-stop ring back and forth a few times and decide if the aperture blades stop moving at exactly the stop it is supposed to. Anyway, My observation with a Sigma 70-200/2.8 was that the aperture was actually at f/13 when set to f/11 on the camera. IE, just the same observation as you made with the FA28-70/4. Jostein ----- Original Message ----- From: "Taz" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, March 11, 2003 9:36 PM Subject: Re: Re[2]: Diaphragm actuator precision survey > Alin > > How are they running the tests on the PZ-1 and PZ-1p's, which were the > cameras that were specifically mentioned as having this problem originally. > They have depth of field preview, but it is a manual function rather then > electronic, that only works with the aperature ring actually turned to the > manual settings according to the manual. It appears to work in the "A" > setting but it actually always goes to the smallest aperature setting of > the lense when in the "A" mode, thus making it useless there. I have noted > that the aperature setting noted in the display does not always seem to > match the numbers on the dial while in the middle, but rather somewhere > close. However the high and low limits are the same. > > My biggest question in all this is the metering in Program modes going to > wind up being off because of this, or is it just the manual modes using an > external lightmeter that are messed up. This whole thing is getting a bit > confusing the more I think about it. Is the metering even going to be > accurate in the manual aperature modes? Which one is the camera going to > use for this metering...the actual position of the adjustment lever...or the > information the lens is feeding the camera electronically......ugh what a > mess > > > > You can bet they would be the same, always. The whole problem lies > > not in what aperture/speed the camera displays, but in what aperture > > is effectively used when closing down the lens. You can't figure this > > without actually looking through the lens... > > > > Servus, Alin > > > > > > >
