Question: to control depth of field and amount of light what should be adjusted
[{'answer': 'the lens aperture diameter', 'provenance': [{'wikipedia_id': '8367', 'title': 'Depth of field', 'start_paragraph_id': 9, 'start_character': 74, 'end_paragraph_id': 9, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Factors affecting depth of field.:Effect of lens aperture.\n'}]}]