When extruding camera 3D models, start with a clean base mesh (e.g., a box for the body) and use targeted extrusions for key parts (lens, grip, buttons) while matching real-world proportions.
Use edge loops to outline details—this gives precise control over extrusion shape, like lens rings or button indents. Adjust depth incrementally to keep proportions accurate, such as how far the lens protrudes from the body.
Check often for overlapping faces or non-manifold geometry—these issues ruin models for rendering or 3D printing.
For beginners, practice on small components (e.g., a lens ring) first—this builds control before tackling the full model.