Unknown macro photo subject

by Macro Mike
(Tinytown)

Can you guess what my macro photo is? I took this close-up picture of something that has to do with photography. That's the only photo hint I am giving you.

The depth of field is very small, so it makes it harder to figure out the subject of the photo. Can you guess?

Please leave your comment about my photo's composition and lighting. Tell me if you like it or what you would differently.

I like it as a black and white photo even more.