A screw-on fisheye converter can be a cheap way to experiment, but don’t expect it to match a real fisheye lens in image quality or overall experience. Community feedback suggests these add-on lenses can be fun for testing the look, but they often produce lower-quality results and need extra care with exposure. If you try one, watch your metering closely; center metering may work better, and shooting RAW can help with white balance corrections afterward.

If your goal is simply to see whether you enjoy fisheye shooting, an inexpensive converter can be worthwhile. If you want the true fisheye experience and much better results, a dedicated fisheye lens is the better choice.

A good middle ground is renting a proper fisheye lens before buying one. That lets you try the real thing without committing to the full cost.