Thank you for reporting this. Some other banking apps are broken, too. Having microG installed does not seem to help here. I’ll file an internal bug report about this.
What comes to the camera, Open Camera and WhatsApp can shoot sharp pictures on my C2 with 5.0.0.62. Open Camera indicates getting the focus by changing the colour of the focus ring.
QR recognition of the Sailfish Camera works, too. Check that “Settings > Apps > Camera > Enable QR code recognition” is enabled.