umcelinho
Marcelo
Hi Dan
1) R-D1 and R-D1s are the same camera, the only difference is the firmware. once you upgrade it, they're equal. The R-D1x has a fixed and slightly bigger back screen and reads SD cards up to 32gb. I have an R-D1 with R-D1s firmware and do not miss neither of the R-D1x features.
2) sensor is bigger than the 450D's and image quality is better, even though it has a lower mp count. I used to have a 450D and prefer the images that I get with the R-D1. all iso values are pretty good, except for 1600, which is just good enough. In low light I usually shoot at iso 800, but when i shoot at 1600 I don't feel there is a significant loss of quality.
3) to get a 35mm field of view in the R-D1 you gotta use a 21mm, which will have a 32mm field of view. you can use an external viewfinder but it's not very practical, at least not for me. what I do instead is to select the 50mm framelines on the viewfinder, then shoot with both eyes open and imagine the 50mm framelines as the center rectangle of a bigger rectangle made out of 9 50mm framelines. this way you get the approximate field of view of thelens and it's rather easy to estimate and get used to. If you're shooting a faster 21, like the 21/2.8 Biogon from Zeiss, which I have and recommend using, you need to pin focus using the viewfinder, so this method makes it easier to do so. if you're shooting a slower 21, like the 21/4.5 Biogon from Zeiss or the 21/4 Color Skopar from Voigtlander, you can get away with hyperfocal focusing, so an external viewfinder would be less of a hassle. for low light shooting, get a 35/1.4 or 40/1.4, they're both pretty good. if you really want a fast lens and are willing to spend a bit more, get the 35/1.2 Nokton from Voigtlander. superb lens.
regarding shooting bands in concerts, the R-D1 does pretty well.
Two with the 35/1.4:

grillo the cricket by Marcelo Colmenero, on Flickr

lit by Marcelo Colmenero, on Flickr
And two with the 35/1.2:

Les Plastiscines by Marcelo Colmenero, on Flickr

Les Plastiscines by Marcelo Colmenero, on Flickr
1) R-D1 and R-D1s are the same camera, the only difference is the firmware. once you upgrade it, they're equal. The R-D1x has a fixed and slightly bigger back screen and reads SD cards up to 32gb. I have an R-D1 with R-D1s firmware and do not miss neither of the R-D1x features.
2) sensor is bigger than the 450D's and image quality is better, even though it has a lower mp count. I used to have a 450D and prefer the images that I get with the R-D1. all iso values are pretty good, except for 1600, which is just good enough. In low light I usually shoot at iso 800, but when i shoot at 1600 I don't feel there is a significant loss of quality.
3) to get a 35mm field of view in the R-D1 you gotta use a 21mm, which will have a 32mm field of view. you can use an external viewfinder but it's not very practical, at least not for me. what I do instead is to select the 50mm framelines on the viewfinder, then shoot with both eyes open and imagine the 50mm framelines as the center rectangle of a bigger rectangle made out of 9 50mm framelines. this way you get the approximate field of view of thelens and it's rather easy to estimate and get used to. If you're shooting a faster 21, like the 21/2.8 Biogon from Zeiss, which I have and recommend using, you need to pin focus using the viewfinder, so this method makes it easier to do so. if you're shooting a slower 21, like the 21/4.5 Biogon from Zeiss or the 21/4 Color Skopar from Voigtlander, you can get away with hyperfocal focusing, so an external viewfinder would be less of a hassle. for low light shooting, get a 35/1.4 or 40/1.4, they're both pretty good. if you really want a fast lens and are willing to spend a bit more, get the 35/1.2 Nokton from Voigtlander. superb lens.
regarding shooting bands in concerts, the R-D1 does pretty well.
Two with the 35/1.4:

grillo the cricket by Marcelo Colmenero, on Flickr

lit by Marcelo Colmenero, on Flickr
And two with the 35/1.2:

Les Plastiscines by Marcelo Colmenero, on Flickr

Les Plastiscines by Marcelo Colmenero, on Flickr