Ai* Conversions for Nikon Lenses by John White
Thanks for finding my service. As of October 2026, I am still converting vintage Nikon lenses although my website is old. Fortunately, the previous one is still accurate in terms of key features (and prices). You can go to the home page of the old site and get started from there or just print the order form. Note: The version on the old site can be filled in electronically.
For some basic updates from what's on the website:
Except for the D7500, there have not been any bodies since 2008 (the year the D90 was introduced) that will need my Type B conversion. My Type A will be all you need for any recent Nikon higher-end DSLRs.
Bodies like those in the D3000 and D5000 series, plus the D60 and D40, can use virtually all pre-Ai lenses without conversion.
Likewise, mirrorless bodies can use pre-Ai lenses (with an adapter) without the need for, or benefit from, my conversion.
I have a For Sale list of mostly Nikon gear available. Contact me for the latest copy. The prices listed are essentially placeholders. I am open to offers based on your research of current prices.
Thanks to all my past and upcoming customers! I hope to get my aged website updated eventually.
John
p.s. I am having trouble with the email address above. Please use jtwhite3@gmail.com for the time being.
734-662-1734 home office, 734-395-0546 cell
* Ai stands for Automatic Indexing (not Artificial Intelligence). :-) Pre-Ai lenses date from 1977 and before. The primary identifying characteristic is an aperture ring with only a single set of f/stop numbers. Original Ai, Series E, Ai-S, and the autofocus lenses with an aperture ring have two sets and don't need conversion.