Sigma Koki 12-piece premium lens set for optical equipment

Sigma Koki Premium Lens Set for Optical Equipment - 12 Pieces
Thank you for looking.
Sigma Koki manufactured spherical plano-convex lenses: The same model numbers are still in use today.
The current homepage uses lowercase model numbers followed by .html.
Current homepage example: https://jp.optosigma.com/ja_jp/slb-05-08p.html
■Same Product Model Numbers (New and Old): SLB-05-08P: ￥4,100
　　　　　　　　　　　SLB-07-40P: ￥2,500
　　　　　　　　　　　SLB-15-90P: ￥2,500
　　　　　　　　　　　SLB-20-25P: ￥2,800
　　　　　　　　　　　SLB-20-70P: ￥2,400
　　　　　　　　　　　SLB-20-150P: ￥2,400
　　　　　　　　　　　SLB-30-70P: ￥3,200 x 2 = ￥6,400
　　　　　　　　　　　SLB-30-100P: ￥2,800 x 2 = ￥5,600
　　　　　　　　　　　SLB-40-170P: ￥4,100
　　　　　　　　　　　SLB-40-200P: ￥4,100

●The 12 model numbers for sale below are as listed above. The first number indicates the diameter, and the subsequent number indicates the focal length (F). SLB-05-08P refers to a diameter of 5mm x F8.

　Diameter 5mm x F8, Diameter 7mm x F40, Diameter 15mm x F90,
　Diameter 20mm x F25, Diameter 20mm x F70, Diameter 20mm x F150,
　Diameter 30mm x F70: 2 pieces, Diameter 30mm x F100: 2 pieces,
　Diameter 40mm x F170, Diameter 40mm x F200

These can be used for experiments such as focusing laser light onto a detector or imaging with a monochromatic light source.

Used item, approximately 35 years old. (Used for about 2 years and then stored in a warehouse.)
　These were used in experiments during research and development of laser application measurement equipment.

●Type: Spherical Plano-Convex Lens
●Outer Diameter φD Size: 5mm, 7mm, 15mm, 20mm, 30mm, 40mm
●Focal Length f: F8, F40, F90, F25, F70, F150
●Material: BK7 Grade A
●Design Wavelength: 546.1 nm
●Coating: Uncoated