Tell us about yourself!
Just an FYI for you.... Such lenses are not junk just because they are attached to an old film camera. Most are fully compatible with new DSLR cameras especially Canon and Nikon SLR lenses and including the one you show in your photos. The lens you are using is actually a nice consumer quality lens that is still sold by Canon - for around $190 new and between $20 and $30 on eBay. Not to spoil your fun but I'm quite sure you can buy or make a much better microscope than this lens makes for less than that. You are to be commended for your creativity though!