JVC GY-HD Nikon Adapter

Hello, i want to buy a Nikon mount adapter ring for my JVC GY-HD110, but every models are located on internet out Spain, my country.
I need some information of the reliability, use, management, results..., and the problems: focus, red flare...
Zork is still making this rings adapters?

Links:


http://cgi.ebay.es/ws/eBayISAPI.dll?ViewItem&item=330342965058&_trkparms=tab=Watching

http://www.mtfservices.com/mtf-prod...aptors/82-nikon-g-to-13q-bayonet-adaptor.html

http://www.reelsense.net/HD-200/JVC-Nikon_Adapters/NikonAdapterCOMPR.html#

http://www.reelsense.net/HD-200/JVC-Nikon_Adapters/NikonAdapter_RED_FLARE.html

http://www.dvinfo.net/conf/jvc-gy-h...35mm-nikon-mount-lens-adapter-comparison.html


Thanks.