Hello,
A 3" hood with work for your K20d, the trick is as you are seeing attaching it to your camera. You choices as gluing a frame to your camera that a hood will attach to or using a hot shoe or tripod mounting support bracket to hold the magnifier in place. Personally, I would not attach anything to my camera with glue.
The
Shape LCD Viewfinder blocks light and features 3.0x magnification for 3" DSLR LCD screens with a 4:3 aspect ratio. This is useful to check focus and increase stability while shooting video. The viewfinder can also be flipped up and out of the way for use as a simple shade while using the LCD screen. Additionally, the viewfinder features an adjustable ±3 diopter for matching the view to your vision. It mounts to the camera by gluing the included protective glass adapter to the screen and then snapping on the finder.
The
Hoodman Cinema Kit Pro includes the HoodCrane, a universal hot shoe mount for LCD accessories. It features a spring-loaded latch that moves the crane up and down. It also swings up and pivots out of the way for shared LCD viewing or still shooting. The other items in the kit work in conjunction with the HoodCrane. The HoodLoupe 3.0 provides you with a magnified view of your shot on the camera's 3.0" LCD during DSLR video capture, so you can accurately check composition and focus. The HoodMAG 3.0 is designed to fit the HoodLoupe with a tighter fit than the HoodLoupe standard eyecup, and provides 3.0x magnification.
Zacuto's Z-Finder Pro 3x optical viewfinder is a necessary tool for shooting sharp, stable video on DSLR cameras like the Canon 5D MkII, 7D, Nikon D90, D300s and others. Whether shooting handheld or on a tripod, the Z-Finder Pro turns your camera's 3" LCD screen into a clear, easy-to-focus viewfinder that lets you see your image in magnified detail even under the brightest sunlight. Just as crucially, the Z-Finder provides an extra degree of handling comfort and a crucial point of contact--between camera and eye--that adds stability to any handheld video.
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