For years I have used inexpensive lenses from Douglas Stewart for field seminars I give. A passable doublet, item 53902 is 5.59, less in bulk (in the 1990 catalog -- probably more now) Douglas Stewart Co. 2402 Advance Road Madison, WI 53704 1-800-356-8370 Fred Rhoades Biology Department, WWU Bellingham, WA 98225 USA FAX: (360) 650-3148 Voice: (360) 733-9149