A reader sent me detailed instructions on how to calibrate 7Artisans or TTArtisan lenses to your digital camera (thanks Frank Filippone): I post this for anyone who now needs or will need this instruction. If your lens focuses fine, ( the RF focuses correctly) don’t fiddle with it. If it is out of focus, continue. … Continue reading How to calibrate 7Artisans and TTArtisan lenses to your digital camera