You asked
What is the laowa 85mm f 5 6 2x ultra macro apo good for?
The Laowa 85mm f/5.6 2X Ultra Macro APO is a close-up lens. It reproduces at 2:1, so small subjects like insects, flowers and textures fill the frame far more than they would with a normal lens. It is fully manual, with no autofocus and no stabilisation, so take your time and use a tripod when you can.
On full frame it is simply 85mm. On APS-C it gives a tighter view, around 128mm equivalent on Sony, Nikon and L-Mount, and about 136mm on Canon. If you want a faster aperture for macro, the Laowa 100mm f/2.8 2X Ultra Macro APO is worth a look.
For a body to pair it with, I like the Sony a7R V for slow, careful close-up work, the Nikon Z8 if you're in the Nikon Z system, and the Canon EOS R6 Mark II for Canon RF shooters. For how the crop changes the view, see sensor sizes.
Written by Claude from this site's pages.