|
For quality higher-power views where wide field of view is unimportant orthoscopics are a fine performer. They tend to be a bit short on eye relief (though not as short as plossls) but at the focal lengths you will need they aren't too bad. They work on the less-glass-is-best principle: less glass and fewer air/glass surfaces = less scatter and better contrast. In the old days with old lens coatings this was a very important consideration. Better coatings have reduced, but not eliminated, the importance of these considerations. My 9mm Nagler is a damn fine ep but my 9mm UO Ortho is perceptibly sharper with more contrast. I use them for different purposes.
|