Exakta Filter Size Chart
Sorry, but Ihagee Exakta did not make their own lenses. I will be compiling a list of popular lenses for Exakta in the near future. However, to further complicate things, there are lenses branded Exakta that were made for other mounts. If your lens says Exakta it's not actually an Exakta. I will make not bother listing those lenses as they are all re-brands.
Click here for Ihagee Exakta's equipment page.
Click here for Ihagee Exakta's lens list.