The O-LC77 77mm Lens Cap from Pentax helps to protect the front lens element from scratches, dust, and moisture when not in use. It features a spring-loaded, center pinch-type design for easy removal and installation.

Spring-Loaded Center Pinch Design    Protects Front Element of Lens

Related Questions and Answers

Q: 1. Is this a variable aperture lens? Meaning will the aperture change when I zoom in or out?

A: The Pentax HD PENTAX D FA* 70-200mm f/2.8 ED DC AW Lens is a constant aperture lens, not a variable aperture lens.

Q: 2. how does one change the aperture if the pentax 28-45 lens is used on a 645n(film) body ?

A: Take your camera to any store that sell the same model or newer or mail Pentax.. HUH?

Q: 3. Do you have all functionalities on a KP? Thank yiu

A: Yes.

Q: 4. Is the silver part of the lens on the silver version made out of metal or it is plastic coated with silver layer?

A: The Pentax HD PENTAX-D FA* 70-200mm f/2.8 ED DC AW Silver Edition Lens is manufactured from a machined aluminum barrel and has a finely textured finish. The silver finish is simply painted aluminum metal.

Q: 5. Where can I get a replacement PH-RBA86? Its the sliding "window" in the lens hood that allows access to a polarizer fitted to the lens.

A: The best way to get replacement parts for it would be to go to the MFR: Pentax Website https://us.ricoh-imaging.com/repairs/

Q: 6. I assume handheld will produce disappointing results. Can I anticipate that a monopod will suffice or is a tripod an absolute must?

A: I started out using it with a monopod but have since gotten accustomed to its weight. I use it handheld and get super sharp pictures. I am usually shooting hyper active birds too. I love it.

Q: 7. Is this lens compatible with the K-50?

A: Yes it is.

Q: 8. What is involved in removing the tripod collar?

A: To remove the tripod collar from Pentax HD PENTAX D FA 150-450mm f/4.5-5.6 DC AW Lens you need to loosen the mounting screw then while pressing on the mounting screw, slide the tripod mount towards the front of the lens.

Q: 9. does either focusing or zooming change the length of the lens?

A: The lens would offer internal focus and zoom, which would not change the length of the lens.

Q: 10. What is the length of the tripod collar?

A: Almost 4 inches (almost 10 cm) long and hangs down 1.75 (4.5 cm) inches from the lens.