Comments about Adorama Adorama Slip On Lens Cap for 77mm Wide Angle Filters, with Outside Diameter of 80 mm:
Initially disgruntled that I had to buy another lens cap to go with the threadless UV filter on my wide angle lens, I found the slip on cap to be a lot more convenient, particularly with stiff fingers on February mornings. I may actually replace all my lens caps.
Comments about Adorama Adorama Slip On Lens Cap for 77mm Wide Angle Filters, with Outside Diameter of 80 mm:
You have a thin WA filter with no threads on the front to hold your lens cap on. So you either go without the cap or you drop [$] on a simple solution to the problem. And IT DOES FIT! The only drawback is your adding to the diameter of the lens and removing or installing a shade is usually made impossible if this cap is in place.