Why don't you do what the big budgets do. Shoot some tests footage from both cameras and have them decide visually. Shoot the strengths and weaknesses from both cameras. Lower costs shooting is always an option a production will go for. The question is is it good enough for what they need? It is in your job as a DP to give them options and give them a realistic idea of what is the outcome of what you can produce with each camera. You might end up getting a red and not knowing how to get the best out of it.. make the shoot look worse then if you had just used a DSLR.
More people are becoming open to the use of DSLR. Personally I try to sell producers on the idea of using it all the time but make them aware of the restrictions. I take them into a bay and show them footage. Otherwise it's just all talk.
I had a producer who saw that I am shooting on the 7d and asked me if I would use it for a feature and I told him without a doubt for the reason that what I can get from it is great in my opinion and I wouldn't want to spend the extra money on a red. He asked if the red was better and I told him that it has less restrictions and that technically what you can do with the color space and the rawness of the image is what makes it "better". But I feel that "better" isn't really the right word. For me the 7d is "better" in so many ways. May not be technically but for what it has to offer for me personally is "better". Sorry if I went on too long with this response.
Never do a shoot with a camera you do not know.
Back to what I was saying about the tests shots. Make sure you shoot a range of tests. Some people with just set up a talking head shot with a three point set up and call it a test...done. Not right. You gotta shoot all kinds of stuff... overlit underlit, different types of wardrobe colors and makeup if necessary, with different lighting ratios, different lens. Challenge each camera and see what performs better. Shoot indoor outdoor all kinds of stuff. You get the idea.
On a side note: I work as a freelancer in an online bay and I can tell you that crap can also be produced with a Red. I've seen some real bad Red shoots in my day. No joke. I've seen 24p mini DV look way better than some stuff I've seen with DP's who don't know what they heck they are doing.
More people are becoming open to the use of DSLR. Personally I try to sell producers on the idea of using it all the time but make them aware of the restrictions. I take them into a bay and show them footage. Otherwise it's just all talk.
I had a producer who saw that I am shooting on the 7d and asked me if I would use it for a feature and I told him without a doubt for the reason that what I can get from it is great in my opinion and I wouldn't want to spend the extra money on a red. He asked if the red was better and I told him that it has less restrictions and that technically what you can do with the color space and the rawness of the image is what makes it "better". But I feel that "better" isn't really the right word. For me the 7d is "better" in so many ways. May not be technically but for what it has to offer for me personally is "better". Sorry if I went on too long with this response.
Never do a shoot with a camera you do not know.
Back to what I was saying about the tests shots. Make sure you shoot a range of tests. Some people with just set up a talking head shot with a three point set up and call it a test...done. Not right. You gotta shoot all kinds of stuff... overlit underlit, different types of wardrobe colors and makeup if necessary, with different lighting ratios, different lens. Challenge each camera and see what performs better. Shoot indoor outdoor all kinds of stuff. You get the idea.
On a side note: I work as a freelancer in an online bay and I can tell you that crap can also be produced with a Red. I've seen some real bad Red shoots in my day. No joke. I've seen 24p mini DV look way better than some stuff I've seen with DP's who don't know what they heck they are doing.
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