I dunno if adaptation is the right word... I have a few CY lenses and a few OM lenses. I had them mostly Leitax converted to EOS. However, after picking up a NEX system I removed the Leitax mount to avoid using 2 adapters per lens on my NEX system. I planned to sell the Leitax kits. Before I do that what I am wondering is... would it be better to keep using a high quality adapter like a Leitax for shooting on EOS and then use a high quality adapter to go from EOS to NEX, or is it better to keep the lens in it's native mount and use only use one adapter??? I did pick up a Novoflex adapter for my CY > NEX lenses, and I have to say I really like it.