I've had the same 16x9 wide converter (0.8x, 82mm) that Lensmith mentions above for about 6 months. I've found it unusable.
Just to be clear...my
RED EYE adapter is a .7X, not .8X, but is threaded for 82mm.
This kind of adapter does not allow you to zoom through it. Only wide. That's why they are so much less expensive than other pricier models which do allow you to zoom through them.
Mine was great for quick wide shots in cars or other tight locations where zooming was not really needed. If I needed to zoom, I did it with my feet (or back, as the case may be).
I used it on my SONY PMW EX3 shooting full HD and didn't have any of the issues you mention.
For what it's worth...I put my
82mm Collinscraft RED EYE up for sale on eBay today.
Here's the company web site which clearly describes what the adapter can and can not do.
http://www.collinscraft.com/
Forgive me Corey if your comments above are about the
16X9 Inc. adapter and not about the
Collinscraft RED EYE adapter.
However...I used my
16X9 Inc. zoom-through all last week on several shoots and, again, never had the issues you mention.
It is a .8X but threaded for 77mm.
The link I posted above is for the 82mm threaded version because the original poster had a lens needing that size threading.
Maybe you got a dud?
Not trying to pick a fight. Just trying to be clear about what I have and like without coming across like a jerk!