Being a Nikon user I have always wanted an ultra macro for tiny wildflowers. All of Nikonís Macro lenses are at 1:1.
Finally Venus Lens has launched the Laowa 25mm F/2.8 2.5-5X Ultra Macro Lens. Order it in a lens mount of your choice.
Itís great for subjects smaller than 1cm.
The lens is in all probability a manual focus one. Wish it were auto focus. Also wish I could test one before buying.