Due to difficulties in tracking some participants' pupils (e.g., drooping eyelids, corrective lenses), reliable eye tracking data were only available from 12 participants.
Due to difficulties in tracking some participants' pupils (e.g. drooping eyelids, corrective lenses), reliable eye tracking data were collected in 15 of the 23 control participants, and in 13 of the 18 ASC participants.
The resulting contrast-transfer curve, or function, gives a more reliable indication of the lens performance under practical picture-taking conditions.
Editors have to turn to old reliables -- long-lens photos of soap opera starlets going topless on Riviera beaches, pictures of women players at Wimbledon taken as a cross-court lunge reveals a glimpse of panty, stories ridiculing Continentals -- particularly the French and the Germans.
Due to this, their data may not be as reliable as other data from human lenses.
To my eye, which is generally very bad at achieving consistently reliable level of focus accuracy on full manual lenses with my DSLR, the split image trick (along with the inclusion of existing focus peaking tech) works amazingly well.
Most hard cases, like those from Pelican, are reliable but bulky, designed for air travel with multiple lenses, but not hiking or climbing and quick access.
It is one lens through which the pursuit of safe and reliable performance under trying conditions can be understood.
Reflections from the infrared beam from eyeglass lenses and frames may interfere with obtaining a reliable corneal reflection; loss of eye movement data can result.
Demme radiated, before and behind the lens, an unstinting curiosity, and a faith that the most reliable map of character was the human face.
