Class 009 film speed & format


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Class 009 film speed & format

  1. 1. Film Format & Film Speed By: Amit Chawla
  2. 2. Difference Film Format refers to the size of the film and with it the quality of photograph that is taken with a particular type of film. This should not be confused with film speed. Film speed describes a films threshold sensitivity to light. It is related to the size of the Grains in the film.
  3. 3. Film Formats Films are available in various sizes and ratios ranging from – Large Format – Medium Format – Small / Standard Format
  4. 4. Various Film Formats 4” x 5” 6 x 7 cm 6 x 6 cm 6 x 4.5 35 mm cm 16 mm
  5. 5. Standard Large Medium Available Less available Less available Affordable Expensive Expensive developed widely Spl film developing Requires spl film35 to 36 shots per roll 1 shot. Less shots per Roll (12-15 ) Used by both used by professionals used by professionals amateurs and professionalsAllows manipulation doesn’t allow allows manipulation but graininess manipulation comes in light equipment heavy equipment heavy and bulky equipment
  6. 6. Why different formats? Larger formats mean finer quality, bigger enlargements and also better camera movements. Small formats mean smaller camera which are faster to use and also portable. Also smaller formats give a greater depth of field than pictures on larger formats (keeping lens and f-number constant) Small cameras as well as small format films are cheaper than medium and large formats.
  7. 7. MOST COMMON FORMAT 135 (ISO 1007) is a film format for still photography, also widely referred to as "35 mm". Introduced in its modern form in 1934 it quickly grew in popularity, surpassing 120 film by the late 1960s to become the most popular photographic film format.
  8. 8. What is film speed ? Film speed describes a films threshold sensitivity to light. The international standard for rating film speed is the ISO scale which combines both the ASA speed and the DIN speed in the format
  9. 9. What does grain size do ? Grain size refers to the size of the silver crystals in the emulsion. The smaller the crystals, the finer the detail in the photo and the slower the film. The lower the number (e.g.. 100), The less sensitive to light your film is, the higher the number (ISO 3200), the more sensitive to light your film is.
  10. 10. 100 1600
  11. 11. Common film speeds Common film speeds include ISO 25, 50, 64, 100, 160, 200, 400, 800, 1600, & 3200. Consumer print films are usually in the ISO 25 to ISO 800 range ISO 25 film is very "slow", as it requires much more exposure for usable image than "fast" ISO 800 film. Films of ISO 800 and greater are thus better suited to low-light situations and action shots (where the short exposure time limits the total light received)
  12. 12. DIFFERENCESLOW FILM FAST FILM finer grain and better  Not as fine color. Slow film resolves finer  Less resolution resolution than fast film. It requires longer exposure  Short exposure . Good for times, so you might need a motion and less light tripod At some point, it becomes wasteful to use slow film if  Shows same product at small u don’t enlarge enlargement
  13. 13. An example
  14. 14. EXTRA INFO Film speed is related to the size of the grains of silver halide in the emulsion, since larger grains give film a greater sensitivity to light. Fine-grain stock, such as portrait film, is "slow", meaning that the amount of light used to expose it must be high or the shutter must be open longer. Fast films, used for shooting in poor light or for shooting fast motion, produce a grainier image. Each grain of silver halide develops in an all-or-nothing way into dark silver or nothing.