At one time in my working life long ago in the Middle East, I dumped all my four (what was considered professional tools at the time) Nikon F3s with MD-4 Drives and lenses for Pentax LXs, Drives/NiCad Packs and lenses. That's two in use while two were being cleaned, Pentax just seemed to have better dust/sand sealing and didn't require cleaning every week, I'd get possibly two or three weeks or more before cleaning.
Trust me sand in the film gate puts a beautiful score across the emulsion on film. Photoshop had yet to be invented so touching up (PP) involved heaps of time and using an actual paint brush, either on negatives, prints or both.
I've still got a couple about he place... this one even has a battle ding on it on the viewfinder base housing.
Last edited by Kerrowdown; 10-21-2018 at 09:33 AM.