Backfocus — Focus behind the desired plane of focus. (Some photographers might call this a “near sighted” lens). For converted infrared cameras, the amount of backfocus will depend on both the thickness of the replacement glass over the sensor, as well as the optical properties of the lens itself. Removal of the sensor glass entirely can result in severe frontfocus, problematic on lenses that cannot focus past infinity.
Article continues for subscribers...
If you’re already a subscriber, CLICK HERE TO LOG IN
diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.