I have been involved in and have listened to many stories of people wanting to do startups. Most of the time, people vastly underestimate how much it takes to really start a business properly (by factors of magnitudes).
I'm not saying this is the case with you of course, but something I see probably 9 times out of 10. Are you talking about opening a retail store? Independent or licensing a brand such as Ritz?
Given the initial investment, property, inventory, marketing, and the list goes on, I would guess the camera business is extremely hard to make any decent money in. The little guys are competing with the likes of the big chain stores, already established smaller business, chain businesses, and of course the internet. Rough order, I would speculate $250K as a dirt-poor minimum and probably more like 500-750K to start it properly. If you are licensing a brand, that of course is not included nor is the percentage they get.
Disclaimer - This is an extreme over simplification