For product photography, if you want to shoot something relatively long, about 2 and a half meters, do you need a wide-angle lens? The camera is NIKON D90

You have to use a wide angle. It is recommended to buy a Tokina ATX116. If the material is highlighted, the lights should not be arranged evenly. The light should be scattered. If the reflected light of the subject is complex, use a circular polarizer. When using the light, the front light will be slightly brighter. Slightly darker at the back or slightly brighter at the back and slightly darker at the front for a more visual impact and layering. To express the size of the subject, it is best to have a commonly used component, ornament or tool that has been disassembled as a reference.

Personal opinions for reference only