2 years ago, I bought a Nodal Ninja SPH2 model. I know ...you will tell me that it is now a vintage piece... but it works just perfect.
Attached is a spherical image (size reduced !) done with a 40D + sigma 18-50 2.8. 36 shots were necessary.
Let me know your thoughts. I still have to learn a lot so don't be shy with your criticisms.
The shots were taken last Sunday....and guess where it is