You are heading for a vacation, you pack your camera, easy-peasy. But what are you actually allowed to photograph and how? While casual photography in Ireland is seen very, well, casual, there are some rules to keep in mind. I’ve tried to sum up a few here.
Please take note that these are my personal interpretations of the law - if you're looking for legal advice you should contact a solicitor. And these rules mainly apply to hobbyists and tourists, professional (commercial) photography is a different kettle of fish ...
Photography in Public Places
Generally speaking you may take photographs to your heart's content as long as you are in a public place. The definition of "public place" here being a place not in private ownership, which you may enter freely and without conditions imposed.
A museum e.g. may be in public ownership, but upon entering it you implicitly agree to obey by any "house rules" - in effect making it "private property" (see below).
Trespassing and Obstructing
One thing you may not do while taking photos in public places is trespassing (obvious) and cause an obstruction. The latter is interesting as it includes not only walking out in front of traffic but may also affect the use of tripods.
"Causing an obstruction" also refers to the effect your snapping may have on the work of a police officer. As this is very much open to interpretation it is advisable to cease and desist if you are asked by police.
Photography on Private Property
You may take photos on private property - provided the owner or occupier agrees with you being there and tolerates your activity. By entering private property you implicitly agree to obey by any rules set by the owner or occupier and made known to you. "Made known" includes house rules posted in shopping malls or similar.
If the owner, the occupier or their representatives (mostly security staff) ask you to stop taking photos, do so - disobey and you may be guilty of trespassing. They do, however, have no right to confiscate (or damage) any of your equipment.
Two special mentions - the Airport Police at Dublin Airport seem to be very negative towards anybody not obviously just taking a snapshot of a loved one. On the other hand, the National Museum of Ireland has relaxed the rules and abandoned the strict "no photography" dictum in favour of "no flash, no tripod".
Photography of Private Property
As long as you are in a public place, you may actually take images of private property such as buildings or artworks ... but the owner may object and even threaten to call the guards. Avoid a confrontation, say "Sorry!", smile and calmly walk away.
One thing worth mentioning are the über-careful rules and regulations laid down mainly in Northern Irish museums regarding photography. In effect you will be asked not to take any pictures of children, a backlash of the prevalent paedophilia hysteria. Many places also ask you to fill in a form and sign it, agreeing to these conditions (though I have never been asked for ID when doing this, leading me to the thought that one could easily use fake names here).
Professional or Amateur?
Take note that "professional photography" is more closely regulated in most places - though what actually constitutes professional photography is open for interpretation at times. If you wan t to sell your images, consider yourself a professional.
Yes, you may, in an open and non-invasive way - unless people object or objections are made on their behalf. Then again privacy laws are very iffy and it might be better to refrain. If you restrict your photography to groups, officials and those participating in some sort of public performance or ceremony you should be okay.
Candids and "Indecency"
As long as you are doing your photography openly you are in safe territory - but once you start hiding in bushes to take candid pictures you may be attracting unwanted attention and hostile reactions.
Another way to attract attention is posing for risqué or even nude shots in public - don't, or at least only do so on Ireland's few (and unofficial) nude beaches.
Northern Ireland - A Few Words of Warning
Northern Irish subjects should be treated with care by the avid photographer - it is still easy to arouse suspicions and even hostility.
While (technically) there should be no problem in photographing any security-related activities (unless signs or security personnel tell you not to), any photographic activity beyond "the usual" will attract attention. An explanation may be required. You may also at times be unsure what is deemed "usual".
Even more of an explanation might be required if one causes suspicions among the population of "flashpoint areas". While taking pictures of murals has become a normal "touristy" activity, taking pictures of individuals or even groups may be seen as "intelligence gathering" for whoever is "the enemy" today. Avoid. Or expect the attention of "concerned citizens".