The Canon E-180D Lens Cap for EF 400mm f/2.8L IS II USM helps to protect the front lens element from dust, dirt, moisture, and other elements during travel and storage. This lens cap is specifically designed for the Canon EF 400mm f/2.8L IS II USM lens due to its large, threadless design.

For Canon EF 400mm f/2.8L IS II USM Lens    Offers Protection to Front Lens Element

Fits Canon EF 400mm f/2.8L IS II USM Lens.

Related Questions and Answers

Q: 1. I have an EOS1V film camera, will this work on it?

A: Perfectly

Q: 2. Lens foot for cannon 400mm do

A: guess you are asking about tripod accessary?Wimberley WH-200 Gimbal Tripod Head II with Quick Release Base Gitzo GT3543LS Systematic Series 3 Carbon Fiber Tripod (Long)

Q: 3. Is this lens compatible with the Original Canon EOS 5D? It is not on the list.

A: Yes. This lens is 100% compatible with the original 5D.

Q: 4. I am awaiting receipt of this lens and have a question about AF with the EF 2X III tele extender. I realize that this will create an f/11 aperture, so no AF through the viewfinder, but I have heard that Live View can be used to autofocus. Is that true?

A: Yes, that is generally the case among cameras possessing a live view autofocus capability such as Canon's Dual Pixel Autofocus feature. More recent Canon cameras that could use the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens (B&H# CA1004002LIS) (such as the Canon EOS 5D MKIV, 1DX MKIII, or mirrorless RF-mount cameras with an adapter) will be more capable in that respect. The 2X teleconverter will reduce the effective aperture (thereby increasing the aperture number) by two stops.

Q: 5. Does any 400 mm DO owner know what the outside diameter of the black ring at the front of the lens is? I'm renting one of these for the up coming eclipse. I want to get a solar filter for the front of the lens but I have no way of knowing what the diameter in millimeters is so I can purchase the right size solar filter from B&H of course.Thanks everyone.

A: I'm not positive of the black ring referred to in the question. As far as I can tell, the front of my lens is not threaded and would not accept a screw-in filter. If the filter in question slips on over the lens' exterior, then I get diameters of approx 117 and 144mm, respectively, for the lens itself and its hood. Might be safest to see and measure the lens to be rented.

Q: 6. Is this compatible with an EOS M6 MarkII with EF-EOS M lens mount?

A: No, as is, it is not compatible with the M6 mark II. You need a lens adapter and then it will be compatible. This is a good adapter option, Canon EF-M Lens Adapter Kit for Canon EF / EF-S Lenses BH #CALA • MFR #6098B002 https://bhpho.to/319Vky9

Q: 7. what size is the thread on the tripod foot?

A: 1/4

Q: 8. WILL THIS FIT THE CANNON 5D III?

A: The Canon 400mm f/4 DO IS II USM lens will be fully compatible with the 5D III, yes.

Q: 9. Image quality 400mm DO vs new 100-400. I understand other tradeoffs but interested in IQ?

A: The Canon EF 400mm f/4 DO IS II USM is better optically than the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens, and also has a one f-stop advantage in exposure over the 100-400mm lens.

Q: 10. Hi, can anyone tell me if the lens case come with keys?

A: Yes 2 keys