Stay away from adapters from buyitjnow (or some such) on ebay - or at least examine carefully BEFORE using lens and frequently during use.
I normally opt for the most expensive option, only to come across someone who bought X from Y at 1/2 the price and has had it work like a charm for 10 yrs. So, decided to try the above route ($30) based on some input elsewhere that indicated adapter was ok, not perfect by any means, but did the job.
Adapter FINALLY arrived today (another issue with vendor) and tried it out. Note: I bought the V-Nikon adapter + a Nikon-EOS chipped adapter from Rudolph (happypagehk on ebay - adapter makes I trust) custom encoded for '110mm f2' so I could have exif data.
First off it seems that the mounting flanges on the V-Nikon adapter are thinner than normal. Took some serious tweaking of adjusters on HK Nikon-EOS adapter to get the two to fit snugly. Unusual.
So, using lens for some test shots (SWEET IQ and handling BTW) and noticed some movement. Thought at first I needed to do some more tweaking when noticed that it was the Nikon side of the V-Nikon adapter was loose. In effect, the adapter was coming apart. Language ensued.
Note: most adapters come in two sections - camera side and lens side attached together. This was no exception.
Well it appears as if the 4 tiny screws that hold the adapter sections together were coming lose FAST. I'd say I was a couple of shots away from the 110/2 F doing a swan dive. If any threadlock was used, I'll be damned if I can see it. More rather 'florid' language ensued.
Pulled the sucker apart, used some threadlock and re-torqued properly. Will be ordering Fotodiox and posting 'feedback' in morning. For the $30 it cost, it's not worth mailing back to HK with my 'compliments'.
May still use this one with due care until Fotodiox unit arrives, but not to any length (and without my hand firmly on lens) until I can tap some new holes for some larger diameter SS machine screws. There is more than enough room.
This was one of these examples of getting exactly what you paid for.