Hello! I was playing around with excel and I thought of something. After about five minutes of work I made a Crop Factor Converter. I don't know if this has been done before, but when I searched for it, nothing came up. If it has been done, or is against the rules, you can remove it. Here's a preview http://www.divshare.com/img/display/1513117-7e3.gif You can download it here http://www.divshare.com/download/1513118-643 You need Microsoft Excel 97 or above to use this. Instructions Under crop factor, type your crop factor. Under Lens Wide Angle (mm) type the widest angle your lens can go Under Lens Telephoto (mm) type the longest focal length your lens has. Your 35mm Equivelent Wide angle focal length will appear under 35mm Equivalent Wide Angle (mm), your 35mm Equivalent telephoto focal length will appear under 35mm Equivalent Telephoto (mm). For prime lenses, you only need to use one box. Wide or Tele will work fine. Enjoy!