The HD lenses work in concert with the Field Flattener
lenses to produce edge-to-edge clarity; less focusing, rich contrast, and color fidelity in a wider field of view.
lenses produce edge-to-edge clarity and require less refocusing.
Lenses: These lenses are located between the prism system and the ocular-lens system.
The EL 42 uses new field flattener
lenses to create a true image and super bright image resolution all the way to the very edge of the field of view without any edge distortion.
The Field Flattener
system will help relieve eye fatigue by minimizing curvature at the edges of the viewing area.
And the Field Flattener
lenses provide a really crisp image right to the edge of the field of view.
In addition to its image stabilizing feature, the 8x25 IS binoculars feature multi-coated lead-free glass Canon optics including field flatteners
for brilliant contrast and excellent edge-to-edge sharpness.