The basic resolution is not good enough. If you want to scan 35mm negatives or slides, we recommend that you buy a dedicated slide scanner. It will add to the equipment bill, but the result is pro quality scans. The most straightforward way is to scan a good photo of the fly. The common flat bed scanners can take any common size print.
Many programs have automatic exposure, which is worth trying first.
Often it is needed with some manual fiddling - especially if you are working with pictures, which are beyond the average. Scanning flies If you have a flat bed scanner, you actually already have an excellent large format digital camera. In this case you should certainly try scanning flies directly in the scanner. The results can be amazing. And it is the fastest and easiest way to get your flies into the computer.