Hello everyone, I recently found my dad's old Praktica MTL5 in my loft.

I've been messing around with it and everything seems to be working, but i'm not sure about the aparture. When I remove the lens (Tessar 2.8/50 Carl Zeiss Jena DDR) the aparture appears to be fully open, no matter which setting I have it set to. The manual states that I should be able to adjust the aparture when it is set to manual mode and see the result through the view finder, however it looks the same.

I haven't loaded a film into it yet. Is there any way of checking to see if they are stuck and if they are, how would i go about un-sticking them?

Many thanks - Mike