If photography is a true passion, and your husband won't support you in it, then you probably have more significant issues than just money.
Boy, isn't this the truth.
I always figured MY job as a husband was to support my wife's interests and do whatever it takes to help ensure her happiness and self-fulfilment. She has started several "hobbies" and never seen them through. Some were quite expensive--as in four-figure sewing machines, saddles/tack, blah blah.
Bottom line is that I can't--and refuse--to put a price tag on my marriage and relationship. Seeing a spouse smile like it's Christmas morning is, as the credit card people put it, priceless.
Being a husband or wife is not a hobby, nor is being a mother or father. We all need something outside our daily grind to fulfill our mind's quests and our yearn to explore what else there is in the world.
This is not unheard of. You're shifting attention to something that is "just yours" and you'll have to figure out a way to include him, or to make him comfortable with it.
Dead on, one hundred percent on the mark.
My wife has gotten involved in several of my hobbies shortly after I began including her in them. A couple of the "hobbies" turned into very beneficial activities for the both of us that quicly allowed us to expand our world. At first, she had no interest in flying, but I was a pilot when we met. Now she is my "first officer" and loves the idea that we can cut our travel time by better than two thirds because of "my hobby."
I taught her how to handle our boat. Again, she quickly fell in love with the idea of taking one of the dogs out with us and "exploring" various shorelines--and I get to take a camera along.
A good relationship entails that you and your spouse are best friends. And friends support each other's interests and endeavors. Friendships should not be over selfish issues, and for certain, marriages should not be.
I hope things work out for the two of you.
Jeff