Bank accept any valuables as guarantee if they are properly insured and the risk is low enough, in the case where the item in guarantee is easy to lose, they may require a second object as backup (such as car) or a second person responsible for payment in case the first person doesn't pay up.
Well, I guess banks have been harder on me than with anybody else, because I've been told and explained several times in my younger age by both bankers and accountants that toys such as cameras, computers or software
CANNOT be used as a guarantee for a loan. Of course, there are obviously exceptions to that rule, for instance if you owe already tens of thousand of dollars in camera gear, borrowing money for 2K$ or 3K$ will not be a problem considering your assets that are very high vs the amount borrowed, but giving the new acquired camera in guarantee for a loan is not serious proposition. But you just said it, if a second person endorses your loan, then it changes the story completely. What a bank will do though, if you have assets or if you have a good credit score, you can be given a "personal loan" that it's not tied to your equipment, but you'll have to accept a higher interest rate though. At that point, you're probably better off asking for a line of credit, but that's hard to get, if not impossible, if you're just starting up in life.
I'm an accountant and budget counsellor so I've arranged plenty of these kind of transaction in the past, you just need to be VERY convincing and have a solid plan to show them.
This is a totally different situation. If you are a budget counsellor, then you are negotiating with banks on behalf of your clients who are on the edge of bankruptcy. Between losing everything and getting nothing back, or give a chance to someone to repair his mistakes so he can pay the bank back, all that backed up by a solid plan, is a different animal. Every bank are doing the best they can to avoid such situations, but once they are forced into it, they will do what's best in their interest, not yours. That being said, this is totally off topic and the OP is not in that situation.
Any case... we're probably talking about a maximum 3000$ loan for a new camera, I highly doubt that a bank would refuse such a loan if the OP can prove he has revenues and isn't head to toes in debt already.
This is again highly unlikely if the OP doesn't have a stable job and regular income. Banks are not there to finance your dream job, they are there to make money on your back with the lowest amount of risks. Never forget this.