FocusSlope — JLF-15

Support a printed ruler at 45 degrees for focus comparisons. Fixed 45-degree face with open sides and a wide stance. MEASURE FIRST: Paper ruler and target must be supplied by the buyer. Not a calibrated focus instrument. USE: Attach ruler to the slope; focus on a separate upright target placed at the ruler centre. Inspect results visually, not as laboratory measurements. Includes one printed slope in matte black PLA. Paper, ruler, target and camera are not included. Dry indoor bench use only. No physical tests of fit, stability or optical accuracy. Images are CAD renders. Design: João Lutz / JoaoLutzFilm, developed with AI assistance. Original CAD.