Of course you can take photos of photographers! It can be fun... They sometimes look pretty silly.
Common courtesy and all the usual rules about model releases and image usage apply.
jerryc41 wrote:
..."Commercial use" means advertising, not just making money. Of course, many publications cover themselves by requiring a release even though it isn't technically required.
"Commercial usage" isn't just advertising, by any means... It's use of a photo on T-shirts, posters, coffee table books, packaging, websites, lunch boxes, or just about anything else.... The key distinction that makes a usage "commercial" is that the image is being used in a manner that will generate income to the user. In that case, the person whose image is being used has potential claim on it and it would be risky to use the image unless they release their claim in writing. Look around sometime, at all the photos being used in commercial manner, that you may not have noticed before.
Educational, fine art, editorial and a few other uses don't technically require a release..... but it's nearly always better to have one signed than not. As noted, many publications now ask for one, for editorial uses. I'd also always get one for fine art usage that involves nudes or might be seen as derogatory to the subject in the image.
Above images are not released but are essentially only being used "educationally" here. I'm not making any money posting any of these photos here. If one of the people being depicted objects and sends me a "cease and desist", I can take it down... no harm, no foul. But if I'd somehow made money off the display of the image here, the person depicted would have claim on some share of that income, and they could sue me for that. Maybe they'd win a judgment and I'd have to pay them... It would be up to the court if I paid them "a half day modeling fee" or if there were added "penalties" of some sort. Or, maybe I'd win in court... but go broke from the legal expenses defending myself.
It's really the user of the image who has to worry about model releases and suits. The photographer would probably be named a the suit, too, but the lawyers bringing the suit are primarily going after the "deep pockets".
Commercial use generally pays a great deal more for usage of an image than do editorial, educational or fine art. The difference can be tenfold or 100X or more. Would you rather get paid $25 or $2500 for use of one of your photos? So for the photographer it also makes more financial sense to get a release signed. It's not really all that difficult. If you are shooting candidly, such as street photography, you can ask for the release after taking the shot.