
1) Abc bigwig bloomberg 2) Actor erwin 3) Actor Erwin, to friends 4) Actor Gilliam 5) Actor Irwin 6) Actor Margolin, to friends 7) After PQR 8) Alphabet run 9) Alphabet sequence 10) Alphabet series 11) Alphabet train 12) Alphabet trio 13) Alphabet trioacross 14) Alphabetic nickname 15) Alphabetic quartet
Found on
https://www.crosswordclues.com/clue/stu

Shoot Through Umbrella. White translucent photographic umbrella; a flash is shot inside the umbrella and the light is diffused onto the intended target; provides a soft, large light source.
Found on
http://en.wikipedia.org/wiki/List_of_abbreviations_in_photography

abbreviation: student
Found on
http://www.encyclo.co.uk/local/20021
No exact match found.