The versatile Kirk Lens Foot for Sony FE 400mm & 600mm GM OSS Lensesfrom Kirk Lens Foot for Sony FE 400mm & 600mm GM OSS Lensesreplaces the original lens foot, attaching directly to the lens collar using the included mounting screws and hex key. The replacement foot provides a lower profile, lighter weight option than adding a lens plate to the existing foot. The double-dovetail design is compatible with most Arca-Swiss style clamps, ball heads, and gimbal heads. The design also allows Arca-Swiss style accessories to attach to the bottom or top of the lens foot, but still provides enough clearance to store the lens hood in the reversed position.

This replacement foot is made from durable 6061-T6 aluminum with a black anodized finish, making it resistant against scratches and corrosion for years of reliable use. Optional safety stop screws may be installed on the bottom to prevent the lens from accidentally being pulled out or released if a clamp is partially open, and 1/4"-20 and integrated 3/8"-16 sockets provide additional mounting options if no clamp is available.

The included 3mm T-Hex wrench can be used to remove the lens's existing foot and to mount the LP-67 using the original lens foot mounting screws.

Fits Sony FE 400mm f/2.8 GM OSS Lens    Fits Sony FE 600mm f/4 GM OSS Lens    Arca-Swiss Style Double-Dovetail Design    Made of Black Anodized 6061-T6 Aluminum    Allows Lens Hood to Mount in the Reverse    1/4"-20 & 3/8"-16 Mounting Sockets    Includes 3mm T-Hex Wrench    Includes Optional Safety Stop Screws

The double-dovetail design provides secure, stable mounting to Arca-Swiss compatible clamping devices

The 6061-T6 aluminum foot is resistant to abrasions and corrosion

Integrated 1/4"-20 and 3/8"-16 mounting sockets provide multiple mounting options

Optional included steel safety stop screws prevent accidentaly releasing the lens when a ball head clamp is partially open

Related Questions and Answers

Q: 1. Does this lens have internal zoom and focusing or does it "grow" in length zooming from 100 to400?

A: the lens expands as you zoom in.

Q: 2. Why is there a sliding vent in the lens shood?

A: Hi Chris - the slide opening in the lens hood is to allow for adjustment (turning) of a polarizer filter without having to remove the lens hood itself.

Q: 3. Does the tele-converter (either 1.4 or 2.0) result in any loss of sharpness.

A: I love my 100-400 Sony lens & like the 1.4 tele-converter as well. I use it mainly on bright days, but even yesterday when it was somewhat dark and snowy I captured some nice bird shots.

Q: 4. How much does the lens weigh?

A: Hello. The Sony FE 100-400mm f/4.5-5.6 GM OSS Lens weighs 49.3 oz (Without tripod mount)/1,395 g (Without tripod mount).

Q: 5. Is the 100-400 significantly better performance and optics than the apsc 70-350? I realize that it is FF vs Crop, but am interested in the slightly longer reach and slightly faster aperture.

A: The 100-400 is better in low light being f/5.6 vs 6.3 on the 70-350. And is optically a sharper lens as well.

Q: 6. it is good in low light conditions? I had the Sony 70 to 300 G OSS and it was terrible at night!

A: the low light performance on this lens is the same as 70-300mm , they both are 4.5-5.6 lenses

Q: 7. When assembled to a Sony 600 GM lens, does the lens still fit within the original Sony hard case?

A: Yes, the Really Right Stuff Lens foot will fit inside the Sony 600 f/4 GM lens case when assembled.

Q: 8. Hi does this replacement foot includes the 4 lens foot mounting screws like the wimberly one?

A: The Kirk Lens Foot for Sony FE 400mm f/2.8 GM OSS and FE 600mm f/4 GM OSS Lenses includes four mounting screws in the box.

Q: 9. I understand a monopod will make it more stable but is it REALLY necessary/would there be too much force been put on the connectors if used without one?

A: Lense is heavy so holding camera alone wont be enough but if your left hand is holding lense and right one on camera you can easily manage without monopod or tripod support. I have been using this lense with A 6500 for quite some time and never had issues, in camera and lense stabilization with quick focus gives steady shots all the time.

Q: 10. If this lens is used with the 1.4X and 2X telextenders will it autofocus on the A7rII?

A: Autofocus will be available on this lens when an FE 1.4X or 2.0x Teleconverter is attached while using it with the A7R II.