OptiMedia Fresnel Lens OMF-53
XLL format (nearly A4), magnifies a whole book page twice.
Groove spacing: 0.6 mm
Size: 290 x 210 mm
Focal length: +85 mm
Thickness: 0.47 mm
Caution: this lens is also a very strong burning-glass that ignites dry wood instantly!
Producer: AstroMedia GmbH, Im Wirrigen 30, 45731 Waltrop, Germany, astromedia.de
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