The Kirk Lens Foot for Canon EF 100-400mm f/4.5-5.6L IS II USMfrom Kirk Lens Foot for Canon EF 100-400mm f/4.5-5.6L IS II USMbolts directly into the lens collar mount and locks into place by tightening the bolt with the included T-hex wrench. The lens foot is compatible with most Arca-type clamps and heads. The double-dovetail design allows other Arca-type accessories to attach to the bottom or the top of the foot, and the 6061-T6 aluminum foot has a black anodized finish, which makes it resistant against scratches and corrosion. In addition, safety stops located on the bottom of the foot prevent the lens from accidentally being pulled out when the clamp is partially open.

Arca-Type Compatible    Double-Dovetail Design    Black Anodized 6061-T6 Aluminum    Replaces Lens' Original Foot    1/4"-20 Tripod Mounting Socket    Built-In Quick Disconnect System    Bottom Safety Stops for Foot    Machined Strap Loop

Related Questions and Answers

Q: 1. Will this lens work on a t2i?

A: Yes, it will work with Canon T2i.

Q: 2. What is the aperture range?

A: Looks like most of your answers have been answered below. But the range is 4.5-32 at 100mm and 5.6-40 at 400mm. The lens is great...sharp images at all focal lengths. From my research and help of another professional colleague...this lens is better than the previous 100-400...and I can see why. Think what you shoot...if it meets your needs...then go for it, I am not disappointed I did.

Q: 3. I am currently using a 7d mark 2 with my bothers sigma 150-500mm and I'm trying to get into nature photography, i find that lens often quite slow to focus and i was wondering if this would be much faster to focus?

A: Far sharper and considerable faster

Q: 4. Should I purchase a filter to protect the glass on a higher priced L series lens?

A: No! A filter will only degrade the quality of the lens. The only filter I would use is high quality polarizing filter as needed or a neutral density filter for special effects. Always use the included lens hood and when not using the lens use the lens cap.

Q: 5. Does this work on the RF 100-500 4.5-7.1?

A: No, this is not compatible with the Canon 100-500mm RF. That lens features a tripod collar instead of a removable foot.

Q: 6. I'm having trouble deciding to keep my 70-300L or sell it and buy the new 100-400L. Any thoughts on why or why not upgrade? Currently I'm using a 60D.

A: I do not have a 70-300 to be able to compare with the 100-400. I use a 70-200 and then the 100-400. I have been very happy with the 100-400. I have carried it everywhere and it has performed flawlessly. I shoot mainly sporting events with it and have had great results. I have a 7D platform

Q: 7. I have a EOS Rebel T3 . Was wondering if this lens would fit my camera and if the camera will do the lens justice? Thank you Jimmie

A: Yes, this lens will fit and function well with your Rebel T3. The new 100-400 is very sharp. It will fulfill you telephoto needs and provide excellent flexibility for subjects from butterflies to birds.

Q: 8. Is this Kirk foot compatible with the RRS lever clamp? RRS advices to use only Wimberly and RRS. THANK YOU!

A: Yes the Kirk Replacement Lens Foot for Canon EF 100-400mm f/4.5-5.6L IS II USM is compatible in any Arca compatible clamp such as an RRS clamp.

Q: 9. Will this lens work for the canon EOS Rebel T7i ?

A: Yes, this lens is compatible with the T7i.

Q: 10. is the Canon Extender EF 1.4X II compatible with this lens? I am curious if I need to upgrade to the III version.

A: Yes it works with this lens.