Silence on set!

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Across
  1. 1. before action
  2. 5. on tracks
  3. 6. spreader of illumination
  4. 8. for darkness
  5. 9. sound transition
  6. 10. out of focus
  7. 11. in charge of set
  8. 13. first every time
  9. 15. builder
  10. 18. does the fittings
  11. 20. very wide
  12. 22. finds the right spots
  13. 23. Lee Strasberg
  14. 28. people
  15. 29. changes everything
  16. 30. under the camera
  17. 31. equipment
  18. 32. Climax
  19. 34. you need more than one
  20. 36. over subjects
  21. 37. up and down
  22. 38. allergic to green or blue
  23. 39. to be respected
Down
  1. 2. from black to white
  2. 3. no more moves
  3. 4. created for radio
  4. 7. presented by 1st AD
  5. 10. behind
  6. 12. makes smaller
  7. 14. opening
  8. 16. concrete
  9. 17. true to mouth
  10. 19. in charge of gadgets and colours
  11. 21. assembling
  12. 24. what it's all about
  13. 25. choices in camera
  14. 26. imaging plane
  15. 27. in camera effect
  16. 33. says it all
  17. 35. for the dark side