7Artisans' ultra-fast cinema prime — T1.05 at 25mm for APS-C mirrorless, designed for shallow-DOF filmmaking.
The 7Artisans 25mm T1.05 Vision is a cinema prime for Sony E-mount APS-C bodies with a T1.05 maximum aperture — equivalent to approximately f/1.0 in transmitted light. At approximately 955g and 82mm filter thread (90mm front diameter) it is a heavy, all-metal cinema lens. Manual focus only — no autofocus. 270° focus throw. 0.8M gear pitch on both focus and iris rings.
The optical design uses 11 elements in 9 groups. Thirteen iris blades produce circular bokeh across a wide aperture range. 82mm filter thread (90mm front diameter). Approximately 955g. Minimum focus distance of 0.23m. Manual focus with 270° rotation and 0.8M gear pitch. Clickless iris with 0.8M gear pitch. T1.05 transmitted light aperture. APS-C image circle. No electronic communication.
The T1.05 specification distinguishes cinema lenses from photo lenses: T-stops measure actual transmitted light through the optical system, accounting for absorption and reflection losses that f-stops do not. At T1.05, the lens transmits nearly the full light of a theoretical f/1.0 optical system — providing the maximum practical shallow depth of field and low-light performance at 25mm on APS-C. The 13-blade iris maintains circular out-of-focus highlights across a wide aperture range with the smooth clickless iris required for video exposure transitions.
On the used market the 7Artisans 25mm T1.05 Vision is available at affordable cinema prime pricing given the heavy metal construction. Condition checks: 0.8M gear ring condition for follow-focus wear, iris smoothness across the full range, front element for marks, and MFD ring operation. APS-C image circle only — full-frame FE bodies require APS-C crop mode. Manual focus; no AF.