dichromated gelatin film
双色胶片

• lens of wide aperture
• lensometer
• lens opimization comuter program
• lens/optical design consultants
• lens paper
• lens pillar
• lens power
• lens retainer
• lens-roughing machine
• lens seat
• lens shade
• Lens speed
• lens stop
• lens surface
• Lens system
• lens sytem
• lens tester
• lens testing chart
• Lens testing equipment
• lens tissue
• lens-to-image distance
• Lens transmission
• lens tube
• lens turret
• lens watch