1) More inexpensive eyepieces are sold, so there is faster turnover.
2) An inexpensive eyepiece made in China has a lower cost to the barrel than an expensive eyepiece from Taiwan or Japan,
so scrapping a number of barrels has a lower effect on the profit margin.
3) American distributors have a significantly lower inventory of the inexpensive eyepieces, both in units and dollars, so maintaining a dual inventory
doesn't increase the inventory costs significantly.
4) Changing the barrels would not please a number of the current or future owners of the eyepieces and high-end companies cannot afford to alienate potential customers.
It's my feeling that there are a small number of intensely vocal critics but that we don't represent the majority of the marketplace.
5) If the inventory maintained in the US is large, then the labor cost of switching the barrels, coupled with the cost of the barrels themselves, might be prohibitive.
High end companies are fighting for market share anyway. They don't want to raise the price $100 to offer a smooth barrel.
6) If some of the high end companies switched, it would be an admission the older design was inferior. That would plummet the value of the company's products,
both in the used and new markets.
7) A significant portion of the market, most notably the low end of scopes, does not have any type of eyepiece binder other than a thumbscrew.
This portion of the market is quite compatible with undercuts, whether cylindrical or conical. Switching for this part of the market would be undesirable.
It is really easy to see why some companies can't switch back to smooth barrels. Indeed. modifications to the undercuts can help.
But, that doesn't excuse those companies for introducing new lines of eyepieces, especially small, lightweight eyepieces, with the same undercuts as their older and larger eyepieces.
TeleVue could have eliminated undercuts in the Delite line. ES could have eliminated the undercuts in the 52° series.
That isn't admitting there is a problem with undercuts; merely an acknowledgement they aren't needed for all eyepieces.
In the meantime, a collet style holder that is wide enough to span across the undercut and engage enough eyepiece barrel on each side is probably a reasonable solution.
I used eyepieces with undercuts in just such an adapter, and they slide in and out easily with no snags.
Edited by Starman1, 04 September 2019 - 01:20 PM.