Hey Bo,
Here's a shot of the one I use (I have a few without infinity focus / glass and they're a pain). No issues with this what so ever.
http://i178.photobucket.com/albums/w...b/IMG_1211.jpg
http://i178.photobucket.com/albums/w...b/IMG_1212.jpg
Here's a
link to one on eBay without a chip.
Here's one with a chip included to assist with signalling when focus is achieved (I went for this style and it works well).
Hope that helps.
Pete