Under certain conditions the 45-200mm seems to search for the focus point. Low contrast where the subject blends in with the background, foreground. Lens at the long end +160mm. Subject is small but relatively close. Missing a few potential bird images due to AF searching to find the correct focus. Not an issue with the other lens. Have set the focus area to the smallest box, no Pre AF and set the AF to AFS. Starting to rely more on MF or AF+MF. Bit quicker under some situations. Any recommendations to speed up the process? For those who have used both the 45-200 & 14-140mm lens have you noticed any significant difference in the speed of the lens to focus onto the subject?