Let me start by mentioning how glad I am that the word "amateur" is part of
this NG, for this is truly an amateur question....

I've got a 9x50 straight through finder and saw this part available for
$6.00 on Astronomics (it actually comes with a 7x50 finder)
http://www.astronomics.com/main/prod...rythin g+Else

I figured how could I go wrong for only $6.00?? It may not be exactly what
would show up in the 7x50, but I bet it'd be pretty close.

Having said all that - my truly amateur question is:
How do ya work the thing? I've read the description on the web page, but
I'm still quite confused - maybe an example would make things a bit clearer
for me. Unfortunately, no documentation comes with the item.

Any help would be greatly appreciated.

Thanks
Alex