Optical transfer function: Difference between revisions

Revision as of 19:13, 11 July 2019

Revision as of 12:08, 20 August 2019

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=== Trend to large-format DSLRs and improved MTF potential ===

There has recently been a shift towards the use of large image format [[digital single lens reflex camera]]s driven by the need for low-light sensitivity and narrow [[depth of field]] effects. This has led to such cameras becoming preferred by some film and television program makers over even professional HD video cameras, because of their 'filmic' potential. In theory, the use of cameras with 16- and 21-megapixel sensors offers the possibility of almost perfect sharpness by downconversion within the camera, with digital filtering to eliminate aliasing. In practice, such cameras currently fail in this respect, and they do not have the processing power to do what is required. The [[Canon EOS 5D Mark II]] is believed to use only every third line{{By whom|date=July 2015}}, and hence suffers bad aliasing, as its [[Optical low-pass filter|optical filter]] is optimized for stills use. The [[Panasonic Lumix DMC-GH2]] may do some processing across pixels, producing very sharp images, but with some aliasing. Nevertheless, suchSuch cameras produce very impressive results, and appear to be leading the way in video production towards large-format downconversion with digital filtering becoming the standard approach to the realization of a flat MTF with true freedom from aliasing.

== Digital inversion of the optical transfer function ==