TY  - BOOK
AU  - Hacking, K.
AU  - Sproson, W. N.
ED  - British Broadcasting Corporation
TI  - Some aspects of optical lens performance (no.36)
U1  - 621.388 
PY  - 1961///
CY  - New York
PB  - British Broadcasting Corporation
KW  - Optical Lens
N1  - Contents: Pt.1. Secondary flare in lenses -- pt.2. The design of lens hoods
ER  -