First to tell you the truth I am very conservative when it comes to nudity and would NEVER in a million years allow my DH to take photos or record our love making. Having said that, I can see that we are all different and some of you are ok with that. Either way this is a very sensitive territory, like many of you pointed out, that is actually defined by law, so it is not a matter of liking or disliking. It is illegal to take a photo of a person without his/her consent, naked or otherwise.
OP I am very sorry that this happened to you, and I am also sorry that some of the comments here are a little too strong and I can feel it that you may feel attacked, blamed, criticized, but the bottom line is, we really are all on your side and are concerned for you. Like I said in my previous post we should not assume that you DH is a criminal and that he will be doing god knows what with those photos, but what he was doing was totally wrong and has to be addressed. If I were you I would talk to him first and see how he reacts and what he says. From all these posts here, you can see that there are indeed cases when perfectly good husbands turn out to be totally creeps and there is a possibility that your is one of them, but may not be. I would start from there and see how that feels for you. You will probably be able to tell if he is hiding something and not disclosing information in which case I would go to the police to seek advice.
I totally understand how you do not want to break your marriage and destroy your life over this as it does not feel such a big deal. I am going through separation right now, but my reasons are very different then yours, still it is hard and not a day goes buy that I do not feel guilt and shame for doing it. Once you start investigating you do have to accept that this may indeed lead to the end of your marriage, and this I know does hurt. Hang in there, be strong, you will get through this, no matter what it ends up being. And always come here if you need support.