Need help with a Canon FD lens to Nikon using an adapter

Hello all,
Sorry if this has been asked before or if this is the wrong place for this question. I recently was given a couple Canon FD lenses, one (50mm 1.8 FD) is giving me problems with the aperture. It will not stop down past f/8 when mounted to the adapter but will work fine between f/8-22. My basic knowledge of this lens is when unmounted, it will stay at a middle aperture but when mounted and the lever is pushed it will then open up fully and manual adjustment of the aperture on the lens will now be operational. I "tricked" the lens into thinking it was mounted by pushing down the pins and turning the mount and it opens up at f/1.8 nicely and switches between apertures with ease which rules out any corrosion or sticking of the blades. The adapter I'm using has an "open and lock" feature and when switching it to locked it still will not open up fully. The adapter works perfectly for the other lens. At this point I am kind of stumped as what to do next, any help is greatly appreciated. Below are images of the lens & adapter.

Regards,
Ryan

With lense unmounted, set the aperture to F22 and check if the lever will move the aperture between 1.8 and 22. In your image it appears to be stuck at some mid aperture. Normally with All lenses the aperture of the unmounted lense is set by the aperture ring, and the lever will then move it between fully open (F1.8 in this case) and the aperture set. That is why you set it at maximum value (F22 in this case) so that the lever can move across the full aperture range.

When the lense is mounted the aperture should be wide open.

Ah, thank you for the info Aroy, I appreciate it! Embarrassingly it turned out to be a user error haha. When I was putting on the adapter I was leaving it on "Open" as I twisted it on then turning it to "Lock," it turns out you have to set the adapter to "Lock" before twisting it on so it pushes the lever all the way til it clicks.

RyanDPW said:

Ah, thank you for the info Aroy, I appreciate it! Embarrassingly it turned out to be a user error haha. When I was putting on the adapter I was leaving it on "Open" as I twisted it on then turning it to "Lock," it turns out you have to set the adapter to "Lock" before twisting it on so it pushes the lever all the way til it clicks.

Click to expand...

Glad to be of any help.