Alright Canon - The time is now. The 400 f/4 DO is awesome, except the DO technology, IMO, isn't quite there in terms of contrast and saturation. Many find the weight of the 400 f/2.8 IS over the top for hiking, or where any quick moving is required. So, we're left with a few compromises to make: Weight, or image quality?



Why not neither. Why not make a 400 f/4 L IS? Here's my vision:


As the newest addition to Canon's renowned series of professional super telephoto lenses, the EF 400 f/4 L IS is a relatively portable, ultra high performance telephoto lens with a wide f/4 aperture. Implemented with Canon's latest Image Stabalizer, the EF 400 f/4 L IS corrects camera shake by an effective 4 stops, and can be programmed to correct only vertical shake with IS mode 2. UD (Ultra-low Dispersion), Super-UD, and Flourite elements are utilized to correct secondary chromatic abberations. Super-spectra coatings are used to maximize contrast and colour balance. With its rugged magesium-alloy construction, this lens is built to professional standards, and complements weather sealing when used with EOS 1D and 1V, along with EF "II" teleconverters.


Alright Canon, I just gave you the product description. Now, make it!