John Ricard Posted November 2, 2023 Share #1 Â Posted November 2, 2023 Advertisement (gone after registration) Which of these 3 focus tabs is the correct size for the 21mm Lux? I've tried to measure it, but I don't understand how to measure the focus ring specifically. Â https://www.ebay.com/itm/275686364726?hash=item4030301636:g:jogAAOSwD-Zj6pd9&amdata=enc%3AAQAIAAAAwO4w1GKaUx8XSyhnHmRxsHgFs5aQungaeffEJ%2B%2FCYsREljhaaKMasDiIwgTCJVFfVr2S4CdUi06LprSP%2BVgdI8ZREgmYBUhIXk6Dv5wrNLVR2hXRdLGIOrKBicHsCCXNT5aZeY1AdHrGYGA3O5GDdfBWCUHZ1urtdVPQQXl2NbR778Ns6Z0TRLBVGKmNfi8j0mPmOeyXSWHQjLr6ukUWD4i4TxGUE%2BiU4XB0wZRUaIVel5QmUUslvnaRRgbJEB7LjQ%3D%3D|tkp%3ABk9SR67CuZDyYg Link to post Share on other sites More sharing options...
Advertisement Posted November 2, 2023 Posted November 2, 2023 Hi John Ricard, Take a look here Which of these focus tabs would fit the 21mm Lux?. I'm sure you'll find what you were looking for!
Carlos cruz Posted November 3, 2023 Share #2  Posted November 3, 2023 (edited) Fairly easy, measure circumference of the lens with a piece of string, dig up math notebook circumference is 2пr, you just need diameter which is 2r edit: math never was my forte better check it with some engineer ;-] Edited November 3, 2023 by Carlos cruz Link to post Share on other sites More sharing options...
Max365 Posted November 4, 2023 Share #3  Posted November 4, 2023 19 hours ago, Carlos cruz said: Fairly easy, measure circumference of the lens with a piece of string, dig up math notebook circumference is 2пr, you just need diameter which is 2r edit: math never was my forte better check it with some engineer ;-] right Link to post Share on other sites More sharing options...
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