This Kase Filter Kit includes a UV filter and a circular polarizer filter. Each filter in this kit can provide one of two enhancements to your imagery while using a Canon EF 400mm f/2.8L IS II USM Lens. A UV filter adapter ring is also provided, as well as a lens cap, and a filter case that can accommodate both filters, which feature multi-coated Schott B270 Superwhite glass for enhanced clarity and color fidelity.

A general-use, clear filter designed to absorb ultraviolet light and reduce the bluish cast of daylight, the UV Filter can be screwed on after the UV filter adapter ring is installed along the front of a compatible lens. Aside from the reduction of unwanted blue casts, no additional coloration or contrast is created while using this filter, and adjustments to exposure are not required. The UV filter is also useful as a general protective filter to leave on a Canon EF 400mm f/2.8L IS II USM Lens at all times. Such filters help to reduce dust and moisture from reaching the front lens element and provide additional protection in case of situations where scratching could occur.

The circular polarizer filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. It is made specifically to fit within the accessory filter slot of the Canon EF 400mm f/2.8L IS II USM Lens. With that lens, the effect of this filter occurs behind the main glass elements instead of in front of them.

The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges, and filters, this directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces and an increase in the saturation of skies and foliage.

The circular polarizer filter includes an integrated locking mechanism to secure it within the compatible lens, as well as an external dial to allow rotation of the filter glass for control of the polarization effect.

Screw-On UV Filter with Adapter Ring    Absorbs Ultraviolet Light    Reduces Bluish Cast of Daylight    1x Filter Factor, No Exposure Change    Drop-In Circular Polarizer Filter    2 Filter Factor, +1 Stop    Helps to Eliminate Reflections and Glare    Reduces Haze in Landscapes    Greater Color and Tonal Saturation    Lens Cap, Storage Pouch

• Absorbs UV light and reduces bluish cast of daylight
• Does not require adjustments to exposure while in use
• Creates no additional coloration or contrast
• General protection filter reduces dust, moisture, and scratches from reaching lens elements
• Schott B270 Superwhite glass for enhanced clarity and color fidelity
• Multi-coated to prevent internal ghosting and reflections

• Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface
• Polarizing filters arrange, and filter, directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light
• Clears up haze in distant landscapes and provides more saturated, vivid colors
• Strongest effect when used at a 90° angle from the sun
• Circular polarizers are ideal for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features
• 2x filter factor reduces exposure by 1 stop
• Schott B270 Superwhite glass for enhanced clarity and color fidelity
• Multi-coated to prevent internal ghosting and reflections

Related Questions and Answers

Q: 1. I have a Canon. 6D Full Frame, will this go well on this camera and also,...APS-C-sized sensor....How much is this?

A: Yes, this lens would be an excellent choice for both crop sensor and full frame Canon cameras. You can find the price listed on the product page on the top right side.

Q: 2. I've read all the responses comparing the 70-200L w/ 2x converter to the new 100-400L w/o a converter. I realize each has strengths in different areas. I can't afford both yet will shoot both wildlife and indoor action; should I wait for the 70-200L to incorperate the recent upgrades that the new 100-400L has?

A: Enter an answer to this questionI have no experience with the 70-200L, but I can say, I had been using the new 100 400L for over 1- years and I am very satisfied with the results. I use it for bird photography and it is sharp and quick. Since birds sometimes are far away or are small, I do lots of cropping and the quality of the image is great! My wife and other friends also have this lens and they are also pleased with it.

Q: 3. Hi, can anyone tell me if the lens case come with keys?

A: Yes 2 keys

Q: 4. 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: 5. How would you say the 400 f/4 DO II compares to the 300mm f/2.8 in terms of sharpness & bokeh? Trying to decide between the two and am inclined to more reach available in the 400mm.

A: The Canon EF 400mm f/4 Do IS II USM lens is so new there are no real world reviews on it yet. It is at this time in pre-order. So there is no comparison made yet on that and the Canon 300mm f/2.8 lens, a href= http://bhpho.to/1xyjxIi. target= _blank http://bhpho.to/1xyjxIi./a In general a shorter lens can be sharper than a longer lens. And a lens with a wider f/stop usually has more bokeh effect unless it is a very wide lens.

Q: 6. Why has this lens just been labelled 'new release' and coming soon? Its been out for ages now.

A: It's been out for a year, but dealer stock is still low. For some reason Canon is not producing a lot of them. Could be a part supplier or some other reason. It has been a great lens for me!

Q: 7. 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: 8. can the lens hood be Reinstalled in shooting position once this UV filter is attached?

A: The lens hood can't be reinstalled in shooting position once the Kase Filter Kit for Canon EF 800mm f/5.6L IS USM Lens is attached.

Q: 9. I have an EOS1V film camera, will this work on it?

A: Perfectly

Q: 10. Will this lens work on a t2i?

A: Yes, it will work with Canon T2i.