|
| Glass aspheric lens is also called condenser lens, mainly applicable for stage lighting, optical lighting system, etc. King Kowok brings in hot briquetting technology from Japan, with volume production ability, including aspheric lens which surface form error is within 100 micron. |
|
| Common quality standard: |
| Diameter: |
+0/-0.5 |
| Center thickness: |
+/-0.5% |
| Focus: |
+/-7% |
| Aspheric lens face form: |
checked by caliper |
| Surface finish: processing surface: |
80/50; aspheric surface: 120/80 |
| Choice of material: |
1、Common white glass: B270. (Nd=1.523) |
| |
2、Heat resistant glass: Pyrex. (Nd+1.474) |
| |
Heat treatment: choose by customers: 1. common anneal |
| |
3、Special reinforcement |
|
| |
 |
|
| |
| Focusing effect of spherical lens and aspheric lens |
| The traditional spherical lens have spherical aberration in theory, it can not focus lights at a point, which means that we can not gain uniform image surface brightness, but aspheric surface can overcome this defect, so we usually use aspheric lens in stage lighting or projecting light to gain uniform image surface brightness. |
| |
| Lens film |
| Film can improve transmission ability of lens. See its effect in following contrast list: |
Lens material |
no-anti-reflection lens
（420-680mm) |
monolayer film lens
（420-680mm） |
wide band multilayer film lens
（420-680mm) |
B270 |
92.0% |
96.5% |
99% |
Pyrex |
92.5% |
96.3% |
99% |
B3.3 |
92.5% |
96.3% |
99% |
|
| |
| |
