The combination of filing down the Ha-2 adapter, filing down of the burr on the backside Nikon WC-E68 and allot of patients I am now shooting at 16mm. So I paid only $35
new for the Nikon WC-E68 and $45 for the adapter.....thats $80 for a 16mm lens. Not bad IMO
I needed patients because I thought it was going to be a one two three mission. In fact I didn't realize how much I would have to file down until the process began. It was important for me to go back a few times to re-read and look closely at what praktinafan
(refer to those pages) said in his instructions and my follow up question.
It took me a week to get it right because every time I would put the lens on and took a shot, there was that annoying Vignetting you speak of. So I would file some more and some more and some more
I of course bought another HA-2 adapter just incase I screwed it up. Not a waste of money since I have filters and hoods I want to use it for.
So, I am not sure you can have the same success(getting 16mm) as some of us have since I do not know if the adapter your using can be modified. However you should know that if you do try to file down the burr on the back of the lens to try to reduce the Vignette that might be an option.
Owen, please re-read my conversation with praktinafan to see if it pertains to you. Once you attach the modified lens to the adapter you should not take it off. As this would put the filed down back at risk of getting ruined.
All the best
......more shots @ 16mm to come tomorrow evening.