High dynamic range imaging methods that combine multiple exposures involve a number of processing details, such as frame alignment, motion artifact removal, and pixel data weighting. When applied to astronomical scenes, these steps require additional consideration. Specifically, motion blur artifacts must be corrected by techniques that are tolerant of saturated pixels, successive image frames need to be registered with point source precision, and the weighting of shorter exposures in the HDR compositing step are limited by signal-tonoise considerations. In addition, if there is light contributed by the foreground sky (common in light polluted regions), it needs to be offset and balanced in a blackpoint normalizing procedure. This paper identifies and describes these HDR issues specific to creating astrophotographic imagery.