I have a SunPak Auto 522 Thyristor Flash Gun I have used with my Pentax cameras for a long time. Is there a way to make this unit compatible with my recently acquired Pentax K10D, without a lot of expense? I have attempted to contact Pentax with this question but I have received no reply as yet. I have been having a ball with the new purchase, but found I could use more flash indoors with some of the things I am trying to do, bounce and distance.