As requested by many users, Fringer finally found a Sigma 500mm F4 OS Sports lens and optimized it. Fringer says it performs very well on X-Trans IV cameras. A good choice for wild life!
The main improvements of firmware v1.70 include:
Version 1.70
Fixed PDAF issues for some lens of the following models: Lens didn’t get recognized by the adapter due to different lens firmware version.
– Tamron SP 15-30/2.8 VC A012