Rattle in 20x60 Lens (1 Viewer)

This my first post, so hello to everyone.

I bought the 773 TSN last week and am concerned by a slight rattle in the lens itself. I isolated the rattle to the lens by taking it off the scope. My concern is clarity at higher magnification. At lower magnification, the scope is perfectly clear but the image degrades above 40x. The problem is I can't lock onto the focus and keep it sharp. I have the scope mounted on a gitzo 3540 with a RRS 55 ballhead with a RRS plate (a system that worked fine with my previous scope, a Vortex Skyliner ED, which by the way has no rattle.)

Does anyone else have this problem or is this normal?

Tom Hook

By "lens" do you mean eyepiece?

N P

Yes, exactly right. Sorry for the lack of clarity.

Yes, there is an old thread about the new Kowa rattly 20-60 eyepiece problem. It may lead to a conclusion if you follow.

http://www.birdforum.net/showthread.php?t=105004

I have an 883 with the zoom, and tested through clear settled air is very sharp at maximum power. Resolution and abberation probably do not have much to do with the eyepiece assembly if the eyepiece is not damaged.You will find lots of information about this on the old threads.

Norm P

And here's another thread that predates the last:

http://www.birdforum.net/showthread.php?t=93456&highlight=rattle

- N

npos

Thanks for those threads, in a sense they eased the distress I first felt upon hearing the rattle. Subsequently, I used a optics chart to test the eyepiece for clarity at all magnifications and the Kowa far outpaced the Vortex (as well it should for the price I paid for it) I think my tests outside on a very windy day today is why the focus seemed to waver at 60x. The rattle remains but the view is great.

What I have also done is email technical support at Kowa to tell them about the rattle and look forward to what they have to say about it. If they have anything interesting to add, I will post their reply here.

Thanks again, I feel a bit better about things.

Tom