Yes indeed! after reading that, all topic's and posts about "150/ 152mm ED" are amateurish of a very low level including dealers and manufacturers
Cause if we spoke in a professional language then people get lost
There's nothing really cutting edge here, it is about building some well-well-understood consumer optic at a reasonable price, the technology is from the 1980's, the fundamental optics design you can do yourself with a notebook computer and free software.
It is also not "premium quality" in the sense that the figure/polish per lens surface is costing a few hundred dollars max only, an hour of work is about 50-100 dollars. It's not using "the best possible materials that exist", the glass companies reserve that for more important clients/industries. It's not using the most advanced fabrication techniques that exist.
If you look at the equations and the data sheets and the textbooks, things are understood quantitatively, in degrees. But consumers want it broken down into marketable buzzwords that one can latch onto and understand intuitively. Then the understanding becomes black and white, and people argue in extremes, whereas reality is grey.
It's not about whether one explains it amateuirish or professional (that's just how good you are with marketing and setting up mystique to sell your product, and if the engineering people started doing that it's the end). It's about the consumer reading textbooks and understanding things better numerically, without the hype and the hearsay.
Edited by X3782, 13 September 2018 - 05:27 AM.