I have a 17 inch and a 19 3/4 inch Kodak Ektanon lens in very good condition each with a flange. I bought them a long time ago and have never used them. Both lenses are coated with the Kodak Lumenized L logo. Are they worth using, are they sharp at infinity and will they cover 8X10? Is there any market for these type of lenses? I currently use a 12 inch and 14 inch Kodak Ektar in Ilex shutters on my 8X10 and they perform very well. Will the Ektanons compare?