Interestingly TMP, I just bought a GXR w/ A12 28mm (haven't received it yet), and own a Ricoh GV-1 viewfinder (the fat one with 21 and 28mm lines). I'm planning on selling the GV-1 since I don't use it much (the LCD is fine and with 28mm view I often just shoot blind anyway), but can do some quick informal testing if you'd like. Ricoh advertises the GV-1 for both GR Digital and GXR I assume it should work reasonably well.
The choice between Sigma and Ricoh is pretty simple to me, they are so completely different cameras for different types of shooters. I love Foveon output but the DP bodies are not for me.
TMP wrote:Well...
Some of you know that I sold my Ricoh GR D III for a GF1 with its 40mm f1.7 lens (in 35mm format).
I am now seriously considering going back to Ricoh and go for a GXR with the A12 28mm f2.5 module. However, I have to look deeper into the compatibility of optical view finders with the GXR (see here:
viewtopic.php?f=60&t=6175).
That being said, given the sensor size of the Panasonic GFx series, it is noisier -- both in terms of image quality AND sound (a big issue for street photography). More importantly, there is no
decent manual focus capabilities when working with an optical view finder on the GFx series (another big issue for street photography). As for the Sigma, its sensor is bigger but suffice to say that the lens starts at f4 and that you either love or hate the Foveon output.
So, Ricoh it is, once more.