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miyaco,
Can't comment on the DReb, although the penta-mirror must adversely affect brightness vs a glass prism. The D30 and 1Ds have the latter, and brightness is the same. What you get with a 1 Series EOS DSLR is a larger AFOV (apparent field-of-view), and a 100% VF. That Canon ships their prosumer DSLRs (like D30) with a VF crop of 95% linear is the height of cheesiness: we are not dealing with slide mounts!
Following is my office as seen through D30 and 1Ds VF: ignore nasty color, barrel distortion, uneven illumination and general blurriness (faults of my old P&S). Discrepancy of VF coverage is apparent in the lower frames (especially in the corners), as these were taken by the DSLR sensors. Test lens was EF 35/2:My claim of equal VF brightness for D30 and 1Ds is based on the top frames: exposures were identical at f/2.4, 1/5 sec. Yes, several shots were required to limit effects of my unsteady hand.
The Canon 1Ds has slightly smaller AFOV compared to my Contax RTS III. Both have tunnel-vision compared to my Leica M, and are dimmer to boot.
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