(1) The video contains some MTF values at F/2.8 for 15 lp/mm and 45 lp/mm (cf. attached image).
While 45 lp/mm compare to 30 lp/mm for a full frame lens, most APS-C lens data (such as on Nikon, Canon and Sigma web sites) only show 30 lp/mm data for APS-C lenses. Therefore, the above curves are pretty decent for the lens, esp. up to 90% of the image circle (or for 99% of the image area).
(2) DPR published a short preview, esp. comparing image quality with the Nikon A
->
Ricoh GR Hands-on Preview: Digital Photography Review
The Ricoh GR has a MUCH better corner performance at F/2.8.
Otherwise, the Nikon A and Ricoh GR look like siblings, with the GR being more competitively priced (but later to market).
(3) The segment of large sensor (fixed focal) fixed lens cameras starts to get crowded. A few entries (the factor is the crop factor):
- Ricoh GR (1.5x, 28mm, F2.8, 16MP, 245g)
- Nikon A (1.5x, 28mm, F2.8, 16MP, 299g)
- Fuji X100S (1.5x, 35mm, 16MP, 445g)
- Sony RX100 (2.7x, 28-100mm, F1.8-4.9, 20MP, 240g)
- Leica X2 (1.5x, 36mm, F2.8, 16MP, 345g)
- Sigma DP1/2 (1.5x, 28/50mm, F2.8, 15MP, 330g)
- Canon G1X (1.8x, 28-112mm, 14MP, 534g)
- Nokia 808 Pureview (2.7x, 26mm, F2.4, 41MP, 169g)
(4) Most of the large sensor fixed lens cameras now are really similiar and not very innovative. Too large, too heavy, too expensive, sometimes not sharp enough, sometimes too wide angle, sometimes not wide angle enough. Just clones of the Leica X which introduced the concept (AFAIK).
(5) For those wondering what I am talking about ... I own a 808 Pureview and more and more it becomes my main outdoor camera now (esp. now as I found it again after having stored it away in a way I couldn't find it anymore -- the caveat of really portable cameras ...).
The 808 is far more lightweight and portable than any other large sensor camera (it actually fits my pants' knife pocket easily), it has the most beautiful screen of them all, and most importantly, it has a resolution capable to deliver the 70mm or 100mm equivalent photos the other (non zoom) cameras lack. And the zoom-equipped versions are even more heavy, with the RX100 actually being the only which at least on paper would be able to compete (similiar dimensions except 2.5x as thick).
The only complaint so far would be that the 808 isn't exactly as responsive as a good stand-alone camera (it is ok, but this is a one picture after another camera).
So, I am wondering why nobody builds an 808-alike dedicated camera: small and capable, but with improved ergonomics for the enthusiast photographer and for action.
Nevertheless, personally I prefer the 808 as it is heads and shoulders above any of the other large sensor compacts.
To showcase, below I attach two recent photos from my 808. Actually, it is one photo, but post processed to two different versions. Taken after dawn, showing Taih fishermen.