Canonas yra isleides tokia knygute: http://www.amazon.com/LENS-WORK-III-Eyes-3rd-ed/dp/B000NSPS3I (webine versija http://www.canon-europe.com/Support/Documents/digital_slr_educational_tools/en/ef_lens_work_iii_en.asp) Gal kas netycia zinot ar nusimato IV versija knygos ?