From my collection; Up for sale a 16 inches F4 E Francais Petzval lens with radian drive and water house slot . The lens comes with original 7 1/2 in flange diameter. The lens is clear, some faint cleaning marks but no major deep scratches or glasses separation. This lens is covered nicely on my 11x14 format at infinity. It is a great portrait lens with very special look for film or wet plate work. Asking price is $3500 plus shipping and insurance. Payment via Pay Pal gift or wire transfer . Serious inquiries, questions, or more pictures, please send me an email via PM . Thanks for checking!