Specifications:
<br />The effective focal length EFL Tolerance ± 2%
<br />Dimensional tolerances Diameter: 0.000 &quot;-0.005&quot;
<br />Thickness: ± 0.010 &quot;
<br />Edge thickness variation ETV &lt;= 0.002 &quot;
<br />Aperture polished 90% of the diameter
<br />Surface Accuracy radial deviation degree / irregularity @ 0.63 m
<br />Plane side: a striped stripes /0.5
<br />Convex side: With the radius changes
<br />Surface Quality 20-10
<br />Antireflection film reflectivity / surface @ 10.6 m &lt;= 0.20%
<br />
<br />Optional Focus 1&quot;25.4mm/1.5 38.1mm /2 50.8mm /2.5 63.5mm /3 76.2mm /4 101.6mm
<br />Diameter:20mm
<br />Tickness:2mm
<br />Material: ZnSe
<br />
<br />Features:
<br />Through high performance, stability, light fine.
<br />Edge polishing, high transmittance, enhanced coating process, durable easy stripping, after focusing, fine spot, cutting and engraving works well.
<br />Widely used in laser processing, laser engraving hine, laser engraving hine, laser marking hine, laser cutting hine indispensable accessories.
<br />
<br />NOTE: When installing the focusing lens concave toward work cutting material surface, the focal length of the lens should be cutthe surface to the minimum point of the light play of focus.
<br />
<br />Lens cleaning Note:
<br />1. Be sure to wear rubber gloves or finger to take the lens, because the hands of the dirt and oil droplets will dirty lenses, no gloves, at least Wash and dry your hands, otherwise the lens performance degradation;
<br />2. Gently put the camera lens to the paper, in order to avoid damage to the lens surface.
<br />3. Do not put the lens on a rough or hard surface, the infrared lens is easily scratched.
<br />4, with medical alcohol swab or cotton ball and gently scrub the surface, taking care to avoid forced to scrub. Preferably clockwise or counterclockwise one-time paint intact lenses;
<br />Remember: When cleaning the lens, must be very careful, wait alcohol dry before use.
<br />
<br />Package include:
<br />1x ZnSe Focal Len