[QUOTE=Magijr;84997]Hi all,

Thank you again for all your recommendations and opinions. I am humbled by the level of professionalism, helpfulness and overall intelligence in this community.

I am meeting with the guy this Saturday who is selling the Canon 70-200L IS F4 for $800. I have the opportunity to purchase this lens, however is there something I need to be looking for in 10 minutes or less to see if the lens is in good condition to buy? I am a bit nervous to spend $800 bucks off of a CraigsList ad, however, if it's used as little as he says it's and it is in as good of condition as he says it is, then it may be a good deal.

[Quote] Look at the exterior to see if it's been well cared for, including the collar and foot. Bring your camera and take some shots with it....does it focus quickly, quietly AND accurately? Is the lens mount tight? Look at the front and rear elements for severe scratches. Look for excessive dust or crud inside the lens. Check the zoom and focus rings....they should be firm yet smooth...no loose play. Look at pics taken with varying zoom and aperature. Zoom in and look closely at the center and all 4 corners of the images. Should be able to check it out pretty well in 15 minutes or so.