Minolta RD-175

Minolta RD-175

Image of the Minolta RD-175
Overview
Type Digital SLR camera
Focusing
Focus Automatic

The Minolta RD-175 was probably the first digital SLR which was hand portable. Up until 1995 when this was introduced, the only digital SLR on the market had a very bulky external digital storage system. There were other primitive digital cameras but they were much lower resolution. Minolta combined an existing SLR with a three way splitter and three separate CCD image sensors, giving 1.75M pixel resolution. [1] The base of the DSLR was the Minolta Maxxum 500si Super (the Dynax 500si Super in Europe and as Alpha 303si Super in Asia). Agfa produced a version of the RD-175 retailed as the Agfa ActionCam.

The RD-175 was also notable as the first consumer digital camera to be used professionally, being used to create the full-motion claymation adventure game The Neverhood.

Technology

Since state of the art CCD resolution at the time was not sufficient for Minolta, the light entering the central 12 × 16mm area of the RD-175's focal plane was compressed by 0.4x relay optics behind the focal plane, similar to the optical reduction system used in the Nikon E series. The light bundled on the smaller sensor area increased the effective sensitivity (ISO) by 2  2⁄3 stops. Then the light was split and sent to three separate 4.8 × 6.4 mm sized 768 × 494 pixel (3 x 0.38 megapixel) image sensors, two used for green and one for the red and blue color, reducing the sensitivity increase to about 2 stops. The only usable ISO was 800.[1]

The three images were combined digitally and interpolated to the final size of 1.75 mega-pixels (1528 × 1146 pixels). Images were stored on an internal PCMCIA hard drive. The camera used Minolta AF A-mount lenses with a crop factor of 2.

See also

References

  1. 1 2 "Minolta RD-175". Retrieved 2012-07-16.
Minolta/Konica Minolta/Sony DSLR and SLT A-mount timeline

Sensor 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
34 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
Professional Full frame α900 α99 α99 II
α850
High-end APS-C DG-7D α700 α77 α77 II
Midrange α65 α68
Upper-entry α55 α57
α100 α550 α580 α58
DG-5D α500 α560
α450
Entry-level α33 α35 α37
α350 α380 α390
α300 α330
α200 α230 α290
Early models Minolta 7000 with SB-70/SB-70S (1986) · Minolta 9000 with SB-90/SB-90S (1986) (Still video SLRs)
Minolta MS-C1100 (1992) · Minolta RD-175 (1995)
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