50mm 1.8 MKI focus trouble?

[sandro9mm]

Lens has big time trouble focusing... it goes forth and back for a while... it takes couple of long seconds to get it right... mainly in poor light conditions, but during daylight it ain't fast either :) I bought this lens second hand from ebay, there is a little white hair inside the lens too... what would u advice? and if u have it, do u also have low light focusing problems?

Honestly, I know its a good low light lens, but if u can't get focus right there is no real use :D and I'm not much fun of manual focus, since I don't have good vision myself :P

[Haley]

Focus and build quality are probably the biggest complaints about the nifty fifty.

For the price optically, it's fantastic. But if manual focus is a big problem for you, you might want to consider the 50 f1.4. It's a surperior lens.

For me, I'm happy enough with my 50 f1.8.

[sandro9mm]

well in my case build quality isn't an issue, I've old metal mount version.... looks good no trouble, but focus is an issue... but 300$ for 1.4... :P maybe...

thx for the advice though

[Tee Why]

Sounds like a possible AF issue. I'd say if it has the same problem on another body, then you may have to have the AF repaired. However, I tink if it's the AF problem, it should be slow regardless of the indoor/outdoor thing. Have you tried cleaning the lens contacts first?