Mom won't let me buy a camera with my own money?

I've wanted the Nikon d5100 DSLR camera for about a year now. I've been researching and found it to be the best, most affordable camera for me. I definitely have the $600, but my mom won't let me get it. All she says is, "It is $600! That is Way too much for you, in college you will need that money." I tell her that I can make money by selling my prints, and photographing others and she says, "Yes, but still, its $600 of your money." That is all she will say.

But I find this ridiculous, because just last year, she let my older sister (by two years) purchase a camera that was $850, and she had no problem with it. My sister barely researched, she just asked my mom and she said yes. My older sister doesn't even use her camera, I've seen her take a picture with it maybe once or twice.

I tell my mom this and she says, "Well she was a year older than you when she got hers". However, mine is $300 less, plus, I have done So much more research than my sister. But my mom doesn't care. She just insists its 'too much money".

Please help! I'm 13 years old and very responsible.

Added (1). @lol- I would, but this is literally my dream camera. It has a flip-out screen, and amazing quality.

Just get a cheaper camera… There are plenty of great cameras for a lot less than that

Maybe your sister's not using the camera is a factor. Save your money and when you're older buy the decked out camera.

She's a selfish mother who wants your money

*Sighs* I'm sorry, but we Mom's are kind of like that. It is a lot of money, and you did make it, but to your Mom, you're still a kid, no matter how mature and responsible, and we still like to think we know what's best for you.

I'm not sure there's really a way to change her mind about that, especially if you've already calmly and carefully pointed out your finer arguments and your mom has reduced her arguments to basically, "I'm your Mom and I have spoken."

I'm sorry you might have to wait a bit, but may I suggest putting the money in the bank, and letting it grow some kind of interest over the next couple years.

Photography equipment improves almost as fast as electronic equipment, and by the time it comes around to where your Mom'll let you actually get your own camera (or you're in college) perhaps there will be another camera that's even better than this one.

And maybe if you ask really, really sweetly, or find something really good to bribe her with,
your older sister would let you use her camera…