Hi,
I ordered 2 Diamondback HDs in 10x28 configuration.
My intended use for this one is as a compact glovebox bin.
The first one I recieved had terrible astigmatism on 1/3 of the field of view, at the right side.
After 5 minutes of looking through them, I was bothered enough to deside to put them back in the box.
I could indeed see some CA, but I think it is something to expect in this price category.
They do look good and this unit had very good working eyecups, hinge, diopter and precise focus without free play.
So I ordered a second pair to see if this would be any better.
Well, there seems two be some variation indeed.
The focus on this unit is also precise but has some free play, the diopter doesn't feel as sturdy as with the 1st unit but stays put, and when focussing I hear some cracking noise.. Both hinge and eyecups work fine.
Luckily, the view is a little better with less astigmatism and maybe a little less CA.
The right side is still a little more fuzzy than left but it's not so bothersome and distracting as with the previous.
I do not really notice it when looking at birds.
The sweetspot isn't really big but it is quit sharp, with good contrast and, I have to say, really nice colour rendition.
I looked at a Greenfinch and a Jackdawn in a nearby tree and they solved really nice details even as the plummage details of a Common Buzzard 100m up in the sky.
I am going to keep this unit. They are not perfect but they can be handy when I need them and I don't need to worry to much if something happens to them.
Grtz