Once you've placed something on your lens like the new LCW Digi Pro Variable ND filter, which can start at 77mm and end in 82mm, you can no longer use the standard hood on your lens. Most likely you'll be using ND filters because you're outdoors on a bright day trying to cut down light. That same light could also cause lens flares and low contrast imaging.
To shade off that ND glass, an expensive and more cumbersome option of course is to have a Matte Box system on rails, or you can slap on a simple folding rubber lens hood. They can fold back when it's not needed or if it's in view of very wide angle lenses. Unlike the plastic lens hoods, these foldable rubber type hoods take up minimal space in a bag when packing. I had to grab myself one for the new LCW. Many are found for under $5 bucks (click here).
Rubber Lens Hoods - via Amazon
Some of the larger versions are more expensive on Amazon, but here's a seller that has the large 82mm version (needed for the LCW) for about $5.00 dollars (click here)
So I placed an order this weekend for my new Canon 100mm IS Macro. (Going to replace my old 100mm Macro - up for sale BTW). I believe it was the last weekend of the available Canon Rebates. So now the price of the 100mm IS Macro jumped back up at least 80 dollars. So i'll need to rock some new Lens Hoods and I thought i'd give these Rubber Lens Hoods a try as suggested by DSLRVideoShooter.com (peep the video below).