A 44-year-old Alexandria photographer indicted on child pornography charges in Northern Virginia and New York City has pleaded guilty to various sex crimes in both jurisdictions.

Lawrence E. Dickens pleaded guilty in Alexandria Circuit Court last week to three felony counts, including sodomy and solicitation, and three misdemeanor charges of contributing to the delinquency of minors, his lawyer said yesterday. Dickens also has entered guilty pleas in New York City to second-degree obscenity and promoting prostitution charges, according to a Queens County prosecutor.

Under the terms of a plea agreement, prosecutors have agreed to seek no more than a 10-year prison sentence, with seven of those years suspended, lawyer John Rosenberg said. The maximum sentence for any of the felony charges is 10 years.

Dickens was indicted by an Alexandria grand jury in December 1980 on numerous counts of sodomy, prostitution of juvenile males, production of obscene materials involving juvenile males as well as contributing to the delinquency of minors. His arrest by Alexandria police ended a four-month investigation begun after he was arrested in a Queens motel on prostitution and obscenity charges. According to prosecutors, he was accompanied at the time by a 17-year-old Alexandria youth, who also was arrested.

Queens County District Attorney John Santucci said yesterday investigators seized about 1,000 photographs of young boys in nude or sexually suggestive poses when Dickens was arrested. He is scheduled to be sentenced in both jurisdictions in late April.