- Tom Abrahamsson of RapidWinder.com
- Bill Pierce - Leica M photog and author
- Roger Hicks -- Author of The Rangefinder Book
- Simon Says -- SimonSawSunlight Photo Technique
- Peter Kitchingman - author of Canon Rangefinder Lens book
- Peter Dechert -- Photographic Equipment Historian
- Jonathan Eastland author of Leica-M Compendium
- Nikon Historical Society -- hosted by Bob Rotoloni
- DIYS Forum