Hi Steven,
Both types work nicely, each has advantages, but this tends to make it not so obvious that one is superior to the other.
Oil spaced, cools faster, can have less scatter and higher throughput.
Air spaced, allows some other optical corrections in the design, new coatings minimize the advantage of the oil spaced on scatter and throughput.
Maybe Roland will add some technical expertice to the thread?
Both types work nicely, each has advantages, but this tends to make it not so obvious that one is superior to the other.
Oil spaced, cools faster, can have less scatter and higher throughput.
Air spaced, allows some other optical corrections in the design, new coatings minimize the advantage of the oil spaced on scatter and throughput.
Maybe Roland will add some technical expertice to the thread?
[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue
Amateur Imager
