Originally posted by cmrhm VonBaloney:
Wow. I almost risk my new lenses! I have a DA 18-135 and pentax macro 30mm lense. Are they both quick shift lense. Is there any manual regarding how to use these quick shift lense? Thanks.
Most of the time, you don't have to do anything with auto focus but it isn't perfect. Sometimes, you may have to tweak the focus a little, especially in a very crowded scene where the AF may focus on something other than what you intend. That's where quick shift is valuable as you can manually tweak your focus. A common use is in portraits where you want the eyes in sharp focus and the AF may choose somewhere else on the face depending on how you have it framed. It's a handy feature even though you may not use it often. I don't own your 2 lenses you mention but a quick shift lens allows you to freely move the focus ring while in AF so if your focus ring is tight, don't try to force it.