Back in October 2006, I had the opportunity to try the newly introduced DA 70mm f/2.4 Limited "Pancake" lens along with the legendary FA 77mm f/1.8 Limited. I posted some sample images from both lenses in the Pentax SLR forum at DPreview.
- The DA 70 is way smaller and lighter than the FA 77. It totally deserves the pancake appellation.
- The DA 70 is a tiny bit sharper wide open than the FA 77 at f/2.5.
- There is some purple fringing with the FA 77, none with the DA 70.
- AF is very fast and quiet with the DA 70, fast (but noisy) with the FA 77.
- The FOV difference between 70mm and 77mm is more important that I was expecting.
- Stopped at f/2.4, the FA 77 seems to expose about 1/3 stop faster than the DA 70 set to the same aperture and the DOF is narrower, which makes me think that the DA 70 is closer to f/2.8 than the claimed f/2.4 wide open.
- As for bokeh, I will let you judge. The topic is just too suggestive and too controversial.
Pictures were taken with K100D (raw), processed with Adobe ACR. No other adjustments then resizing for the web.