Aida Imaging AIDA CS4K-3611V 4K Varifocal 3.6-11mm Auto-DC Iris CS Mount Lens

The AIDA CS4K-3611V is a 3x varifocal lens built to resolve full 4K detail, covering 3.6 to 11mm at f/1.6 maximum aperture. Field of view spans roughly 71 to 23 degrees on AIDA's 4K 1/2.5-inch progressive CMOS cameras, putting it in a useful middle ground between a wide establishing shot and a tighter presenter shot. Unlike the fixed-iris HD lenses in AIDA's lineup, the CS4K-3611V uses an automatic DC-driven iris that adjusts to changing light on its own, which matters more at 4K resolution where a blown-out highlight or crushed shadow is easier to see.

At 45.9 x 35.4mm and about 2 grams, it is a compact add-on for AIDA's 4K CS-mount camera bodies and is optimized specifically for that sensor size rather than being a generic third-party lens. Manual focus and zoom rings let an installer dial in the shot once; the auto-iris then handles day-to-night light changes without further adjustment, which suits a fixed install in a lobby, classroom, or conference room.