Depth-of-field (DoF) — achievable DoF will vary according to:
- Eye accommodation capability
- Working distance; longer working distance = longer DoF
Field Size (FS) — achievable FS will vary according to:
- How close the ocular is to the eye
- Working Distance; longer working distance = more FS
- If you use any kind of prescriptive or corrective lenses (distance, reading, "pharmacy readers"), a current prescription should be provided for incorporation in your loupes in order for them to perform to specification.
- The only exception to this is where the user elects to wear contact lenses.
- Telescope, Oculars: 5 Years
- Telescope, Assembly parts: Limit
- Aero Titanium Frame: 3 years
- Oakley Frames: 1 year