Europe • Great Britain
| Henry Fox Talbot patents the calotype process. It is a negative-positive process that has advantages over the Daguerreotype positives of which there was only ever a single copy. Calotypes were also called Talbotypes though the inventor never approved of this. (February 1841) |
| Europe • Great Britain | Henry Collen opens the first Calotype studio in London under a license from Henry Fox Talbot and uses the portraits as a starting point for miniatures. (August 1841) |
Europe • Ireland
| The first Daguerreotype studio in Ireland opens in Dublin above "the Rotunda". It was probably under the auspices of Richard Beard but this is not certain. On 23rd April 1842 an advertisement appeared announcing that Le Chevalier Alexander Doussin Dubreuil had commenced practice at this address. (23 October 1841) |
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