Fresnel collecting lens in XXL format (almost DIN A 4!), only 0.6 mm flat and 39 g light. Magnifies a whole book page 2-fold.
Caution! This lens is also an incredibly powerful burning glass, which concentrates the sun's heat in the focal spot to 400 times its original value and lets dry wood immediately go up in flames.
Size: 274 x 210 mm
focal length: + 310 mm
Caution! This lens is also an incredibly powerful burning glass, which concentrates the sun's heat in the focal spot to 400 times its original value and lets dry wood immediately go up in flames.
Size: 274 x 210 mm
focal length: + 310 mm
Properties
- 837240