Hi, Julian,

This is a red-tailed hawk in juvenile plumage, hatched in the late Spring of 2016 and due to molt into mature plumage this summer.

There is an expected 70% mortality during the first year of life (3 in ten will survive their first year).

Although his presence may scare off the small seed-eaters attracted to the feeder, the red-tail feeds mostly on small rodents. It is a terribly INEFFICIENT predator on the small, seed-eating bird species. They are just too agile to be caught by the larger, slower moving red-tail.

Dave

Greetings, if the front lens element is really frosted it will likely reduce the amount of light entering the lens, but you should be able to adjust for that with your camera. If there are scratches on the outer surface of the front lens element the scratches should have only a minimal negative effect on the image. So, I suggest that you simply clean the outer surface, attach the lens to your camera and take a few shots.
It is very likely that the lens glass was procured from Karl/Carl Zeiss in Germany. He had access to the very best glass and he/his factory was the best at grinding, polishing and coating lens elements. Your grandfather must have been really something.
Best regards, Ricker

I hear you, but I think the OP hit a nerve that seems to have resulted in almost unanimous condemnation of his "joke" in the strongest terms over 13 pages and counting. Being the loving father of a 28 year old son who is my "best bud", I was personally angered by OP's intended joke. It is extraordinarily rare on this forum to see a contentious thread in which almost everyone is in complete agreement. I think that says something more about the OP's poor judgement and perceived parenting skills than about the universally negative responses to it. Since the OP is new here and only has 25 posts so far, I'm guessing we won't hear from him again after the response he got. He started this thread with barely more than 20 posts here and this was the the most appropriate subject he wanted to share with us as a newbie?