Never saw astigmatism , same here .
IIRC Tom sent 4 eyepieces to Mr. Seronik for evaluation , of the four , three were found to have astigmatism and the
only one not used in the tests , the 5mm , Mr. Back found not to be defective .
The strange part is how these eyepieces ended up in Mr. Seronik hands . From what I remember it goes like this .
Mr. Back wrote that he picked the four eyepieces at random from stock and sent them off without checking them
first . He had quite a few eyepieces in stock , when the eyepieces were returned and he found that 3 of the 4 had astigmatism , Tom , IIRC checked the rest of his stock and found no problems . It could be me but I found this to
be quite odd . At any rate this was a blow that was easily avoided .
What you recall is now what I remember reading. It was an odd occurrence and no one, including him or Markus, saw the aberration again. Seronik's review really hurt sales for those that either did not know someone with experience using them and could lend credibility to the fact these were not representative of the design and production. That it was a new ep line and the first run turned into a worst case (they had to reduce prices to move them) until more and more user's could corroborate that was not their experience and the production was true to design but for those three examples.
We (I) were fortunate Markus finally gave into the constant chant he was getting to make that third run; and he required a commitment of purchase for x percentage of those 50 pieces he agreed to produce through Schott. He took advantage of that run and produced 50 pieces each including the 18- and 21-mm focal lengths, which had only existed on paper to that point. I regret not purchasing at least the 18-mm. He stated upon announcing that run there would absolutely be no more produced. Glass prices for such a small production at the expected specifications had become considerable.