SELFOC® Imaging Lens Advantages: Small Diameter Stable Cylindrical Shape Simplified Mounting The SELFOC® Imaging lens is commonly used as an objective lens for small diameter imaging systems where conventional lenses are not suitable due to size limitation. The lens is designed to gather light from an object and form an inverted image at the back surface of the lens. Typical applications include fiberscope (attached to a coherent fiber bundle) and rigid endoscope (attached to a relay lens such as a SELFOC® Rod Lens, see next section). SELFOC Imaging Lenses are specified somewhat differently that SELFOC MicroLenses (SML). While SML performance is controlled through the lens pitch and gradient constant (ÖA), Imaging Lens performance is controlled via the working distance (WD) and image quality factors such as resolution and field curvature. For this reason, ILW and ILH lenses can consistently exhibit good image quality despite variations in ÖA and/or Z (Lens Length). Proper handling and storage of lenses. Table 2 Specifications Lens Type & Dia.(mm) Lens Length Z (mm) Resolution (LP/mm) Typ. Chromatic Aberration (mm) Typical ÖA (mm-1) (Magnif.)-1 at WD=5 mm Field Curvature (m m) View Angle (2q) Refractive Index (N0) Center @ 0.8R ILW-0.25 0.70 +/- 0.10 400 150 --- 2.319 19.1 40 50° min. 1.643 on axis ILW-0.35 0.96 +/- 0.10 300 120 49 1.710 14.1 40 ILW-0.50 1.39 +/- 0.13 250 100 51 1.203 9.9 50 ILW-0.70 2.00 +/- 0.20 200 80 82 0.856 7.1 60 ILW-1.00 2.95 +/- 0.30 200 50 102 0.600 5.1 80 ILW-1.30 3.96 +/- 0.35 180 40 144 0.462 3.9 100 ILW-2.00 6.54 +/- 0.60 160 30 261 0.299 2.7 150 ILW-2.70 9.34 +/- 0.80 140 20 314 0.222 2.1 200 ILH-0.25 0.50 +/- 0.10 400 150 --- 3.126 26.9 40 70° min. 1.666 on axis ILH-0.35 0.74 +/- 0.10 350 120 35 2.196 18.4 60 ILH-0.50 1.05 +/- 0.15 300 80 42 1.569 13.1 80 ILH-0.70 1.50 +/- 0.20 280 60 47 1.118 9.4 100 ILH-1.00 2.19 +/- 0.30 250 30 76 0.786 6.7 100 Specification Notes: Standard working distance is 5 mm for all ILW and ILH. Diameter tolerance is +0/-0.05 mm for all ILW and ILH. Resolution is measured on a U.S. Air Force chart while a 100X microscope is focused on the back surface of the imaging lens (see Figure). The chart is placed at 5 mm, the standard working distance, away from the lens. Resolution is measured at both lens center and 80% of the lens radius and normalized by the magnification factor. Field curvature is the difference in focal positions between the lens center and at 80% of the lens radius. End surface is inspected at 20X magnification. No chips and cracks are allowed within 90% of the lens radius. Material Toxicity: This product contains components which might be toxic. The user is advised to pay special attention to such toxicity when using this product in medical devices for people or animals. Hand-held copier Storage and Handling.   Ordering Information Example: Type Diameter Pitch Wavelength AR Coating; Metallization ILW 025 W05 055 C1M AR Coating: NC = Non-coated; C1, C2 (for diameter ³ 0.7 mm only, 50 pieces minimum) Metallization: M = Metallization, 0 = Non-metallized (or diameter ³ 0.7 mm only, 100 pieces minimum)