I regard the aiming function of the mirror as critical to its usefulness.
My Dad and I experimented with a mirror once. I was partway up a 14'er and he was across the valley bottom in a meadow.
Using FRS radio he described where he was so I could aim to flash him while he video'd it. Range was about 4 miles (used GPS).
The 6th picture on this webpage shows it (poorly, using video capture)
http://coloradowreckchasing.com/YaleDC3/trips.htmlCLICK ON THE PICTURE TO GET A HIGHER RESOLUTION LOOK
I found it quite difficult to keep the flash on him steadily enough that he could get it on the video. Minutes would go by without him getting flashed even as I struggled to aim it right where he was.
If I'd used a supported position it might have been better.
It was very educational how important the sighting system was.
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