These front-mounted converters are generally safe because they screw into the lens’s filter thread, so they don’t directly strain the autofocus motor in normal use. The main risks are mechanical: cross-threading, overtightening, or putting extra leverage on the front of the lens. If your lens has a rotating front element, switch to manual focus before attaching it; that’s a sensible precaution with screw-on accessories.

Image quality is usually the bigger compromise. Cheap wide-angle/fisheye/macro attachments can be fun for experimenting, but don’t expect the sharpness or overall performance of a dedicated lens. Community experience here suggests they often produce softer, less crisp images.

Also be careful when carrying the camera or lens with one attached. Because these adapters add length and torque, they can stress the front of the lens if bumped or packed carelessly.

So: they’re usually okay for casual use and learning on a budget, but handle them gently and keep expectations modest. Dedicated macro and wide-angle lenses cost more because they generally deliver much better optical quality.