Re: telephoto lens

Scott:

FYI, from my years as a controller from long ago before Reagan and I
had a disagreement in terms and conditions of employment: The letters
on an airplane were 5" high as you have seen. However, to better
enable aircraft ID the standard was raised to 12" so they could be read
more easily. I can't remember if it was a mandatory change for all
aircraft, but I suspect not. So, you will see both sizes in the
aviation field. Hope that helps clarify that point.

.