On my M6, the end of the VF is closer to 26-27mm. That's a long way to 21mm. I would use a finder or pick up an R4 (which has frame lines for 21,25,28,35 and 50. I would use one until you can visualize what you'll get in the frame without the finder.
If you don't want to buy an optical finder try fabricating a wire frame "sportsfinder". If most of your shots are scenics it should wrok well used in conjunction with the camera's finder.
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