Because my DSLR has a cropped sensor ( i.e. it 's not a full 35 mm sensor this is about an 80 mm equivalent , or a slight telephoto ) If you 're not familiar with the concept of replaceable lenses on cameras then I 'll quickly explain . A prime lens is one with a fixed focal length , i.e.

Question: What hobby has the narrator seemed to have taken up ?
Answer: None of the above choices .They have taken up collecting antiques .They have taken up photography .They have taken up sports .