I am finding Lunas fairly difficult to photograph and would appreciate any tips. It isn't about under or overexposure (or maybe it is?), but avoiding bringing out any flaws on the wings. Many times, flaws such as color mottling of the wings, scratches, and other imperfections are showing up in the image. The scratches can be dealt with in processing software, but the color mottling is especially troublesome to try and eliminate after the fact. What are some good settings I can try to achieve the most uniform wing coloration, yet giving sufficient detail without emphasizing color mottling imperfections in the wings? I have already tried various softboxes and diffusers. For a Polyphemus some weeks back, the softbox did wonders compared to nearly normal speedlight flash, but such a softbox doesn't seem to be helping with the Lunas.
Soft box doesn't really help photographing flat object, unless you are using with flash in proper direction. If you are photographing specimens, consider it as 2D, meaning your flash should stand and must flash in same direction as your camera (or little angled). Are you using flash diffusers? It really helps. Show us your setup, and ask for further and detailed advice.