Apologies if this has been asked before, but a quick search didn't throw up the answer.

Today I frittered away a fiver on a set of Vivitar 'auto' extension tubes for my GX-10. Everything fits fine but, of course, my kit lenses don't have an aperture ring and the extension tubes have no electrical contacts.

Is there any sensible way of using this combo, or do I now need to track down a cheap compatible lens that has manual aperture control?

Thanks!