field flattener

field flattener

[′fēld ‚flat·ən·ər]
(optics)
A thin planoconvex lens placed in front of the photographic plate in some telescopes that have a curved focal plane so as to focus light on the flat plate.
References in periodicals archive ?
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.
Field flattener lenses produce edge-to-edge clarity and require less refocusing.
Field Flattener 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.
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.