Compatible with: Canon 5D MII, 7D, T3i or the Nikon D3000 or D5100. More info here.

Specs:
  • Fits 3" LCD Screens
  • 2.5x Magnification
  • -4.75 Diopter Correction
  • Ideal for Nearsighted Shooters
  • 40mm Diameter Lens
  • Anti-fog Coating
  • Lightproof Eyecup
  • Gorilla Plate & Mounting Frame
  • Extender Frames

Compatible with: Canon 5DmkII and Canon 7D

More info can be found here

Specs

  • CNC Milled Aluminum Housing
  • Anodized and Powder Coated Housing
  • Non-reflective Internal Housing
  • 2.75x Zoom Factor
  • +1.5 to -2.5 Adjustable Lens
  • 3 Custom Lenses in 2 Groups
  • Fully Coated Optics
  • Anodized Aluminum Lens Housing
  • Removable Eye Cup
  • Quick Release Plate
  • X / Y / Z Mounting Adjustments
  • 1/4 20 Mount Point for Articulating Arms
  • No Image Distortion or Edge Softness