To deal with your various questions: Yes you can bring your car into Amish country .
While the area is home to many Amish families it is not run along Amish lines.
There are roads and shops and all the usual things you would find.
If you have actual business on an Amish farm then they are OK with you driving onto it, just as you would visiting any other private property.
Amish understand the modern world and its gadgets.
Choosing not to use specific technologies is not based on ignorance (nor, by the way, do they believe "technology is evil").
It is not illegal to take photographs but it is terribly impolite , just as you would probably consider it impolite if a whole bunch of tourists followed you down the street photographing you while you were going about your normal business.
The Amish are not tourist attractions and dislike being treated as such.
Some Amish do have religious objections to being in photographs, and you may find that if you point a camera at them some will turn away from you.
However you will not be arrested for taking photographs - you will just hugely annoy the people involved.
Amish are not hostile to strangers.
Hospitality and tolerance are part of their beliefs.
However they are also private about their beliefs and their lifestyle.
Behaving impolitely will not endear yourself to them.
Please try to avoid it.
Finally - please read up a bit about the people and their lifestyle before you visit.
You will get a lot more out of it.
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I actually listened to a podcast on the Amish a couple of weeks ago, based on this article on Howstuffworks .
I'd recommend it for some solid background.
They're not idiots - they do have education, and they know fully what a camera is, but choose not to use them.
They generally would prefer you not to take photos - as DJClayworth said, imagine tourists taking photos of you while you were going to work or whatever.
Their faith and lifestyle means they're very open and hospitable, and from the sounds of it would have a very interesting perspective on life, if you chose to engage with them and find out more.
Not that I could live entirely in that lifestyle, but after the podcast, I could understand their views on some matters.
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You're not dealing with idiots or religious fanatics.
Them not participating in modern conveniences doesn't mean that they don't know what those are.
There are sites like: Lancaster PA PA Dutch Country and various reviews and posts on Trip Advisor that will help you to plan your trip.
And just for kicks Amish are not a uniform group , so there are variations on practices.
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Having grown up in a similar conservative Anabaptist community and now living near a large Amish community, here is my $0.02.
Rental car--absolutely!
As other answers point out, members of Amish communities own their homes/farms but not the roads.
Of course, be aware of the alternative transportation modes you will see, and slow down for buggies, scooters, bicycles and pedestrians.
Remember also that most horses do not appreciate cars coming too close to them--keep a nice distance away from them to avoid causing accidents.
Cameras--if you try to take photos without permission, you are likely to have the unsettling experience of having the Amish turn their back on you.
This is not because they do not know what cameras are or because they believe photography is evil, but because they take literally the Biblical injunction not to create an 'image' of anything.
If you choose to take photos anyway, it is respectful to do so discreetly and make sure there are no recognizable faces in your photos.
Finally, realize that these are people just like you, who have chosen to live a very different lifestyle.
They are friendly but reserved, and most members of these communities will do their best to answer your questions provided you are polite and respectful.
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The other answers here are good, but don't fully address the photography question with the attention I believe it deserves.
Many (perhaps most)
Amish do actually have a religious prohibition against photography, and thus will likely be actually more offended by the taking of photographs than the average person being treated as a tourist spectacle.
This article discusses the issue.
The religious prohibition comes from the Biblical prohibition against "graven images."
How strictly this is interpreted will vary widely (not just among Amish, obviously).
Your best bet is not to take any photographs where people will be recognizable, or to ask permission first (but be prepared to have your request rejected).
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Am I allowed to bring my rental car into Amish country?Do they allow cameras for pictures? Will they understand what cameras are?   I know it's a very agrarian area but that's about it.    Is this a community that tends to be welcoming, tolerant, or resentful of outsiders who are passing through and exploring their part of the country?
Traveling to Amish country
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Amish people are not ignorant of the modern world and are not hostile to strangers, so you can bring your car into Amish country. It is not illegal to take photos, but Amish are not tourist attractions and it could be considered annoying and rude if you followed them down the street photographing them while they were going about their normal business. Finally - please read up a bit about the people and their lifestyle before you visit. It is not considered a problem to take modern gadgets into Amish areas. However, care should be exercised when taking photographs as many Amish have religious objections to having their photograph taken. It is considered best to ask permission before taking photos. Reading about the people and lifestyle before travelling is a good idea.
Taking a car into Amish country is not a problem. The Amish are not hostile to strangers, nor religious fanatics. They know what modern gadgets are, they just choose not to use them. Taking photographs in Amish country is not illegal but it is a good idea to ask permission first as some Amish dislike it for religious reasons and others may simply turn their back. It is recommended to read about the people and lifestyle before visiting.