“Enough resolution” depends on what the finished image must reveal. For a compact CSI camera project, a sharper-looking preview is not the same as a usable saved frame. Before choosing the current 5MP CSI camera listing, make a small test target that represents your real task: a label, component marking, plant feature, or object boundary.
Put the smallest important feature in the frame
Place the target at the distance you expect in the finished project and mark the area you must inspect. Photograph a ruler beside it so you can repeat the setup. Save an unedited frame, then inspect the feature at its actual image size rather than zooming a preview indefinitely. If a printed character spans too few pixels to distinguish from its neighbors, the nominal megapixel count has not solved the task. Moving the camera closer or changing the framing may help more than changing a software setting.
Separate focus and lighting from pixel count
Take one sample under even light and another under the lighting you expect to use. Check the center and the part of the frame where your subject will really appear. A soft edge may come from focus, motion, or poor illumination; do not assume the camera's listed resolution is the cause. Keep subject distance and lighting notes with each original frame so later samples can be compared without guesswork.
Use a clear acceptance check
Choose a result that a second person could verify: “the full part number is readable,” or “the boundary between these two adjacent objects is visible.” Repeat the capture at the planned mounting position. If the result is inconsistent, revise the scene or ask for a sample from the exact item being ordered before scaling the project. This method helps assess image detail without turning unverified configuration details on a product page into a setup promise.