====== Impact of Photo Format ======

  * The size of photo sensor/film format has biggest impact on lens size and weight

**Example Comparison Chart**
^ Name                    | format | equivalent FL | length | diameter, filter | weight | min focal distance |
^ Panasonic 35-100mm f2.8 | m43,2x | 70-200mm      | 100mm  | 67mm, 58mm       | 360g   | 0.85m              |
^ DA 50-135mm f2.8        | 1.5x   | 75-200mm      | 135mm  | 77mm, 67mm       | 765g   | 1m                 |
^ A 70-210mm f4           | 1x     | 70-210mm      | 149mm  | 72mm, 58mm       | 680g   | 1.2m              |
^ tamron 70-200mm f2.8    | 1x     | 70-200mm      | 194mm  | 90mm, 77mm       | 1150g  | 0.95m             |
^ Panasonic 100-400mm     | m43,2x | 200-800mm     | 172mm  | 83mm, 72mm       | 985g   | 1.3m              |
^ tamron 150-600mm        | 1x,1.5x | 225-900mm    | 258mm  | 106mm, 95mm      | 1951g  | 2.7m              |
^ sigma 150-500mm         | 1x,1.5x | 225-750mm    | 252mm  | 95mm, 86mm       | 1780g  | 2.2m              |
^ DFA 150-450mm           | 1x,1.5x | 225-675mm    | 241mm  | 95mm, 86mm       | 2000g  | 2m                 |

====== Video Format ======

  * https://en.wikipedia.org/wiki/List_of_common_resolutions

===== video file format =====

  * CinemaDNG, digital negatives of individual frame of recorded video
    * intro: http://www.adventfilmmakers.org/5-things-you-need-to-know-about-cinemadng/
  * ProRes, a FinalCut editor friendly format made by Apple
    * ProRes4444, for 12bit 5k, 4k and 2k lower video wrapper
    * ProRes422, for 10-bit 4k, 2k, HD source video wrapper
      * HQ, 147-220Mb/s
      * LT, 100Mb/s
      * SD, 42-63 Mb/s
      * Proxy, 36Mb/s
    * ProRes422, for 8/10-bit FHD or HD source video wrapper
    * ProResSQ, for compressed codec wrapper
  * DNxHD, a Avid editor friendly format made by Avid