I agree that these are long reads but really interesting:
http://optics.org/indepth/2/7/3
http://rohs.exemptions.oeko.info/fileadmin/user_upload/Stakeholder_comments/Exemption_13_several_industry-stakeholders_27_March_2008.pdf
Via: http://www.dpreview.com/forums/post/52159193
In short, lead-containing glass is still better optically, less temperature sensitive, more stable and actually
Monday, 16 September 2013
Lead Glass and Lead-free Glass for Photographic Lenses
Posted on 03:12 by Unknown
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