I call those very early ones zeros, to differentiate them from the (later!) ones that have more metal up top to hold that rubber eye cup on. So, in that sense, the type zeros have more Effective Eye Relief (another phrase that I made up!) Sometimes, when a word(s) is needed, time to get creative and invent one! Actually, that is the etymology of language itself!
On the other hand... I continue to call Pluto a planet, in deference to my hero, Clyde Tombaugh, and despite the retro-demotion imposed by professional astronomers. Tom
The funny thing is that the kids wouldn't have minded at all if the solar system grew to 23 or more planets--they'd know all the names sooner than the old guys like us.
There are many reasons why the term "dwarf planet" is an arbitrary one. The term planet is still there, and it is quite small, like Ceres, but it's round from gravitation and
has some activity going on in its structure.
Now, keeping Pluto as a planet and not letting any of the other round outer bodies be classified as planets is not particularly a smart classification.
So, let's simply go to 23 or more planets right away. Why not? The number of satellites of the outer planets seem to multiply weekly, so why not planets.
It's the 21st century and we're discovering planets around other stars too.
A couple more points to be made about Nagler eyepieces. Lab tests of the first ones showed an 84° field, not 82°. That's interesting.
And the designs for the Type II Naglers predate the Meade Series 4000 UWAs, which is also interesting.
Some day, someone will have to write a modern chronology of eyepieces, but there are so many now, the task would be daunting.