Designed for the Canon EF 400mm f/2.8L IS III USM lens, the AP-601 Quick Release Replacement Foot from Wimberley is an anodized 6061 aluminum foot that is Arca-type compatible for use with most clamps and heads on the market. By replacing the original factory foot, the AP-601 adds rigidness and stability and reduces flex and vibration while mounted on a head. Additionally, a double dovetail allows accessories to attach to the bottom or the top of the foot. The lower profile of the plate provides better balance when mounted on a head as well. If you're going to use the optional safety stop screws, Wimberley recommends using a clamp with channels, which allow the screws on the foot to slide back-and-forth.

Arca-Type Compatible Replacement Foot    Anodized 6061 Aluminum    Double Dovetail Design    Provides Rigidness and Stability    Reduces Flex and Vibration    Lower Profile Provides Better Balance    Optional Safety Stop Screws

Related Questions and Answers

Q: 1. Do not see any threads for filter mount, how do you protect the glass from dust and scratches?

A: The 400mm f/2.8 has no front threads, only a rear drop in filter. The front element has a protective front glass. The deep hood also protects the front glass from damage.

Q: 2. Is work with 400 f2.8 is 11

A: The Wimberley AP-601 Quick Release Replacement Foot for Canon EF 400mm f/2.8L IS III USM is incompatible with the Canon EF 400mm f/2.8L IS II USM Lens. Instead, get the Wimberley Replacement Foot for Canon 400 f/2.8 IS I & II and 600 f/4 IS I & II Lenses, BH #WIRFCAP604.

Q: 3. Will this replacement foot work with a Sony 100-400 E mount?

A: The Wimberley AP-610 Quick Release Replacement Foot for Sony FE 100-400mm f/4.5-5.6 GM OSS is the correct option. https://bhpho.to/2TxDShK

Q: 4. Is this foot compatible with the Canon EF 500mm f/4L IS II USM Lens ?

A: Your Canon EF 500mm f/4L IS II USM Lens would not be compatible with the AP-600, but rather the Wimberley Replacement Foot for Canon 300 f/2.8 IS II, 200-400 f/4 IS, 500 f/4 IS II, and 400 f/4 DO IS II Lenses, BH # WIRFCAP603. https://bhpho.to/3zDnsMb

Q: 5. Will this fit the newly announced mark 2 version version of the 70-200mm f/2.8 GM?

A: The new 70-200 II GM has the same tripod foot design as the previous one so it should work.

Q: 6. Will this be compatible with RRS LR clamp?

A: Yes the Wimberley AP-610 is compatible with any Arca Swiss compatible clamp such as one made by really right Stuff.

Q: 7. Does it work with RF 400f2.8? Thanks

A: No. System will only mount the Canon EF 400mm f/2.8L IS III USM lens.

Q: 8. Does this foot have any type of strap attachment point?

A: No, there is no place to attach a strap unless you attach a strap that screws into the tripod thread, like a Black Rapid strap but will have to be removed to attach the foot to a tripod head.

Q: 9. Is it compatible with the Canon RF 600mm f/4L IS USM Lens?

A: Yes, this is a replacement foot for canon EF 600mm f/4L IS III USM

Q: 10. Does it balance well with 500mm pf and d500/d850 on a gimbal head?

A: Yes! This is excellent for the combinations you've mentioned. :)