QuickHitRecord Posted November 10, 2014 Share Posted November 10, 2014 Here is a neat little trick for using lenses that have rotating filter threads with height-adjustable matte boxes: If you don't already know the inner diameter of the opening at the rear of your matte box, measure it with calipers. Go on eBay and order a lens hood with an outer diameter that matches your measurement (I got mine from a seller called mkstudio-us; they have a chart of all of their lens hoods, complete with inner and outer diameters as part of each listing). This will attach directly to your matte box. Now measure the outer diameter of the frontal lens body. If it is significantly smaller than the inner diameter of the lens hood that you just purchased, then you're going to get a light leak. To correct this, purchase a step up ring to screw onto the filter ring of the lens that also has an outer diameter of less than the inner diameter of the lens hood. You don't want them to touch, just to be as snug as possible. If you really want to protect yourself from a light leak, or you need some room for a focus gear, then you can also purchase an additional lens hood to screw into the step up ring (but make sure that its outer diameter is less than the inner diameter of the first lens hood). Mount your matte box to your rods, clamping your lens hood, and screw your step up ring to your lens (add your second lens hood if you bought one). Push them together, so that the lens hood is resting on the step up ring. Adjust the height of your matte box until your step up ring has enough clearance to turn without making contact with the lens hood. The inside of these lens hoods is ridged and matte black to absorb light, so it seems to work pretty well. I like this solution a lot more than attempting to use conventional "nuns knickers" because there is no friction, and it's better than sticking to round filters because any slight marking or dirt on the glass can become distracting when it is rotated. Quote Link to comment Share on other sites More sharing options...
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