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Given the dearth of affordable long lenses for my A77ii, I bought a Sigma 170-500. It sorta autofocuses at the low end zoom and not so well at the high end. Nonetheless in my quest to get closeups of birds, I bought a cheap 2x extender teleconverter (Jessop MC 2X MX/AF). It seems to work on manual focus but it's REALLY HARD to get a clear focus. As I examined my lenses, including the one that does work just fine (Sony 18-135), I notice a little lever inside the lenses (photos attached). Do you have any idea the function of this lever? The one on the extender seems unfastened, giving no resistance and moving back and forth easily when detached. Could this lever affect the AF?
