|
No worries Mark. I understand there are risks involved in AR coating and that would naturally complicate any commercial endeavour.
The oiled triplet does make a lot of sense for one off production. Even more so if it allows you to shorten the f ratio and make the tube length more user friendly.
D&G must have ways of reducing their costs somehow. I have heard that Barry Greiner the owner of D&G makes his main income through other optical contracts and that is also why lens production can be sporadic and lead to long wait times.
R Royce advertises an oiled doublet that sounds interesting but it would be f15 and very long.
For me if I am honest with myself and considering the cost and the convenience, I am probably better off with a Mewlon Cassegrain.
|