see also:

• Sony FE E-mount full frame lenses
• 50mm full frame lenses for Sony E-mount
  • Sigma 50mm f/1.4 DG HSM Art full frame lens

• compact, high quality, weathersealed standard AF lens for Sony E mount full frame

• 55mm f/1.8 full frame AF lens
• weathersealed
• 9 rounded blades;
• close focus 0.5m;
• 49mm filter;
• 70.5mm x 64.4mm; 281g;
• $AU1150

• dpreview.com review
  • extremely sharp across the full frame wide open with minimal CA or distortion
  • impressively sharp, outperforming the 50mm F1.8s and 1.4s for Canon and Nikon SLRs by a substantial margin but much more expensive
  • 1.6EV vignetting in corners; ~1% barrel distortion
• http://slrgear.com/reviews/showproduct.php/product/1656/cat/82
  • a little soft wide open away from the centre, much better at f/2.8 and best at f/5.6-8
• http://www.dxomark.com/Lenses/Sony/Sony-FE-Carl-Zeiss-Sonnar-T-STAR-55mm-F18