Can a sports camera be modified with an external zoom lens?

? Of course. But the modification is very technical.

Moreover, zoom lens imaging is not as good as fixed focus lens; For example, in the zoom lens of the same product grade, the imaging quality of 18 ~ 200mm lens is not as good as that of 17 ~ 70mm lens or 70 ~ 200mm lens. Compared with the wide-angle fixed-focus lens with the same focal length, the wide-angle zoom lens has greater image distortion than the fixed-focus lens.

In fact, whether you choose zoom or fixed focus, it is more important to weigh yourself. Everyone will have a different answer. Zoom lens brings us more flexibility and possibility of composition, while fixed focus lens will undeniably have relatively high image quality and high cost performance. If you are shooting on the road, recording daily news or even street news, the zoom lens seems to be a good choice, but if you need to shoot in low light, such as at night or indoors, or focus on shooting portraits that need to be separated from the background, then the fixed focus lens may be more suitable for you.