Picked up a kenko tcon NAF-d (this is nikon af-d right?) from cash converters for 20+. I was thinking of
1) sending it for a wash. Would it cost less than $10?
2) break the glass and use it as an extension tube. It looks identical appearance wise to my kenko 25mm. I'm assuming an extension tube is a tcon w/o glass, rite?
3) Take it as a course in lens design by dismantling it and DIY a cleaning. Would not wanna do this unless necessary.
Which option should i try? In case i wanna clean it, where would be the best place and standard prices for cleaning tcons?