Alignment mirror for film holders and copy stand – align camera

Sensor plane parallel to the film: In Live View, the reflection of your lens shows you whether the angle is correct—verified rather than estimated. Sharp right into the corners: A tilted sensor plane costs sharpness on one side of the image and slightly turns the rectangle into a trapezoid. Neither can be recovered in post-processing. No measuring tool and no app: Place the mirror, move the reflection of the lens into the center of the image, and remove the mirror. This works with any camera that has Live View. Compatibility For any setup in which a camera is positioned vertically above a flat negative, regardless of camera brand, lens, or tripod head. Our range includes: Copy Stand for Analog Digitization and Scanning Film Scanner Set for 35mm Film Scanner Set for 120 Medium Format Film Scanner Set for 35mm Sprocket Film Holder Scanner Set for 110 Pocket Film Film Scanner Set for Minox 8x11 Duo Film Scanner Set for 35mm and 120 Format Masks for Kaiser FilmCopy Vario The mirror is placed loosely and is not glued down. Leave the backing film on the adhesive side. It requires a flat support surface of at least 50 x 50 mm. Package contents 1x 50 x 50 mm alignment mirror, with protective film on both sides. Technical details Material: Acrylic, mirror-coated Dimensions: 50 x 50 mm Shape: Square, straight-cut edges Back: Self-adhesive with backing film Front: Protective film; peel off before first use Shatterproof Description Anyone who photographs negatives with a camera sooner or later has to deal with one corner that refuses to become sharp. The cause is rarely the lens and almost always the angle: the sensor and film are not parallel to each other. At 1:1 magnification and f/8, the depth of field is in the tenths-of-a-millimeter range; across the width of a 35mm negative, roughly one degree of tilt is enough to exceed this tolerance. The mirror makes this angle visible. It sits where the film would normally be and reflects the image of your lens back into the camera. When the reflection of the lens opening is centered in the image, the optical axis meets the film plane at a right angle and the sensor is parallel to it. This is a geometric condition, not an estimate. Compared with a spirit level, this has a practical advantage: The bubble level aligns the camera and film holder separately against gravity, so you measure twice and add two errors. The mirror measures the angle directly between the two, giving you one measurement and one result. Acrylic instead of glass, because the mirror is handled above the light table: It will not shatter if it happens to fall. How to align it Set up the film holder as you will use it for scanning later. Peel off the protective film and place the mirror in the center of the film support. Position the camera vertically above it, switch on Live View, and display the grid lines. Focus on the reflection—not on the mirror itself, but on the front element you can see in it. Stop down to around f/8 to f/16. The opening becomes smaller and therefore more precise as a target point. Adjust the tripod head until the lens opening is exactly in the center of the image. A geared head allows finer adjustment than a ball head. Remove the mirror, insert the film, and refocus. Do not adjust the tripod head again afterward. Place a small lamp beside the mirror, shining upward: The lens will be illuminated and stand out clearly against the dark background in Live View. Detailed instructions with diagrams, a calculation example, and a verification test: Photographing Negatives: Aligning Camera and Film in Parallel with a Mirror Short demonstration of the method using a geared head, in English: DSLR film scanner mirror leveling method