Paid $25 for it brand new. Red marker is useful for aligning hood for quick installation. Inside petals have a matte layer to prevent internal light reflections into the lens. Cheaper aftermarket hoods may not have this additional matte layer. You will not be able to use the stock lens cap with this hood installed so think about upgrading to an aftermarket center-pinched snap-on lens cap and most will come with a very useful tether string so you don't misplace the lens cap. In addition, you will not be able to use the internal flash on the 450D/XSi with the hood attached to the 18-200mm lens because the upper petal will cast a shadow anything above 80mm zoom. Maybe the 40D/50D does not have this issue? An external 430EX or 580EX flash being mounted higher may eliminate this issue.