Originally posted by Tonto I think I have seen these types of lenses sold with add on Macro lenses, they often screw on the top for wide and you take it off for macro.
I really only bother with these with fixed lens cameras but for the price you cant really go wrong
Part of my worst lens-buying f*ckup was buying a vastly overpriced macro-wide strap-on. It comes in two pieces, both with the same rear thread. The front piece is the wide-converter when paired with the rear piece, the macro converter. The front piece is inscribed with brand, model, thread, and focal multiplier. The rear piece is inly inscribed MACRO and has the same thread on both ends.
The rear (macro) optic can be used by itself on a host lens. The front (wide) optic CAN ONLY BE USED atop the rear (macro) piece! The front (wide) piece by itself WILL NOT focus sharply atop ANY host lens at ANY distance. And using them together, I get tremendously sharp pictures of dust and any other debris in the lens system.
I suspect that you have the front (wide) piece and lack the rear (macro) piece. If so, what you have is useless by itself. Good thing it was cheap, eh?