BOKEH of Biotar 58mm lenses vs Canon 50mm A706696 Carl Zeiss Biotar f2 on Sony A7ii back bokeh A706754 Carl Zeiss Biotar f4 on Sony A7ii back bokeh A706676 Helios 44M4 f2 on Sony A7ii back bokeh A706739 Helios 44M4 f4 on Sony A7ii back bokeh A706658 Canon 50mm f1.8 on Sony A7ii back bokeh A706724 Canon 50mm f4 on Sony A7ii back bokeh DSC07143 Carl Zeiss Biotar f2 on Sony a6100 back bokeh DSC07116 Helios 44M4 f2 on Sony a6100 back bokeh