Magnifying attachment for camera LCD monitors that reduces glare and improves visibility, enabling precise focus checks in bright daylight conditions.
Technical Details
Professional LCD loupes use achromatic lenses with 50-75mm diameter and focal lengths between 40-60mm. Magnification is typically 2.5x for 5" monitors and 3.2x for 7" displays. High-quality models like the Hoodman HoodLoupe achieve resolutions up to 1200 lines with minimal chromatic aberration. The eyecup sits 15-20mm from the LCD and shields ambient light up to 99%.
Variants differ in mounting systems: magnetic mounts for monitors with steel housings, clamp mechanisms with rubber grips for various monitor thicknesses, or screw-thread adapters for specific manufacturer models.
History & Development
The first LCD loupe specifically developed for film monitors was launched in 2008 by the Californian company Hoodman, after digital cameras like the RED One required professional LCD monitoring. In 2012, Zacuto expanded the concept with swiveling loupe systems for shoulder rigs. With the advent of 4K monitoring from 2014 onwards, manufacturers like SmallHD and TVLogic developed loupes with higher optical precision for pixel-accurate focus control.
Practical Use in Film
DoPs primarily use LCD loupes for critical focus control on wide-angle shots and macro lenses, where EVF viewfinders are impractical. On "Mad Max: Fury Road" (2015), cinematographer John Seale used magnetic loupes on wireless monitors for vehicle-mounted cameras. The loupe enables precise focus pulls on f/1.4 lenses even in bright daylight.
Typical workflow: Monitor calibration to Rec.709, mount loupe for focus control, during critical takes the focus puller works exclusively via loupe magnification. Disadvantage: Limited field of view prevents an overview of the image composition.
Comparison & Alternatives
LCD loupes differ from EVF viewfinders in their flexibility – they work with any monitor, whereas EVFs are camera-specific. OLED monitors with 1000+ nits brightness have significantly reduced the need for loupes since 2018. Modern 7" monitors like the SmallHD 703 Bolt with a 3000-nit display often replace traditional loupe setups.
For Steadicam or gimbal work, loupes remain indispensable as external EVFs are too heavy. For director monitoring, larger 9" monitors without a loupe are better suited than small displays with magnification.