Canon FD

[colin wells]

Hi a quick one this can Canon FD lenses be used in half stops the same as a Olympus OM lense

 

[colin wells]

Sorry i meant between the half stops

 

[trythis]

Stopped down, it seems they pop at half stops on my A1 but at larger apertures I can hold the ring at between 3.5 and 4. But why?

 

[colin wells]

I have the Canon EF and in manual mode to get the needle to sit in the centre of the notch the lens aperture sits between half stops

 

[AgX]

Why would one need 1/4 stop increments?
Aside of that, they likely would be inaccurate.

 

[colin wells]

I have been using the OM system on witch you can use any position on the aperture ring and its OK . Being new to the FD system i was wondering if that was the same or to just use the stops on the ring and as stated in manual mode the needle will sometimes only sit centred in its notch if a between setting is used.On the OM1 any setting can be used to centre the needle and achieve a good exposure .

 

[AgX]

The click-stops are on the aperture ring, not the blade assembly. You can set intermediary positions a the ring, and the blades will follow that. But positioning the ring steadily between the arrests can be tricky.

With the breech-lock models you can easily control the working of the aperture without body:
-) close breech-lock ring
-) arrest aperture closing lever in closed position