Canon E-43 Lens Cap for 43mm Fitment: This lens cap is one of the best for Orion. It provides support and provides proper adjustment of the lenses. It can be used for long focal lengths. This is what I needed. I can do some decent mount work on this zoom but I cannot do it for this kit. The only reason I have to give this lens more than a 90mm is because of how easily it can fold so easily.