Macro lens caps?

A diopter lens will allow you to focus closer. They work better with longer lenses (85mm or longer). The weaker the diopter, the better is the result as a rule.

The edges of the images tend to be quite soft on these shots so stop down quite a bit.

A true macro lens will be a flat field lens and is suitable for photographing documents, stamps, coins, etc. Close focusing lenses tend not to be flat field and will not render flat surfaces in focus across the entire field.

Its a cheap way of achieving a similar effect, although image quality will suffer. They might work ok with your 18-55mm as the minimum focus distance of that lens is 25cm, but they do work better on the longer lenses.

Personally you will get better results with extension tubes (Kenko) and a good macro lens, tamron 90mm f2.8 isn't too expensive
 
Do you mean close up lens adaptors - look like a screw in filter that fit the front of the lens and allow you to get closer to the object you're photographing?

If so, they're a cheap way to get started with macro photography. Marginally worse image quality than using a reversing ring (way of mounting your kit lens backwards onto the camera body) or using manual extension tubes (fit between the lens and the camera body) both of which are the other cheap ways of getting into macro shots. None of these methods are a substitute for a proper macro lens, but any of them are a way to get an idea if you actually enjoy macro photography.
 
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