If it is cost-effective, it must be D90, but if you have used D300S, you will definitely not think about D90 again. However, FX is the big trend in the future, and D700 is the best if there are more meters.
The D90 is an entry-level SLR camera, and its quality is inferior to that of D300S and D700s. The functions of D90 and D300S are basically similar, but there is not much difference in video recording, continuous shooting and focusing. However, after all, the D90 is an entry-level camera, which is actually far less than the D300S. The D700 is a full-frame camera, but neither the D90 nor the D300S is. D700 is the cheapest of Nikon SLR full-frame cameras, but among these three cameras. It is an irrefutable truth that a price determines the share of a commodity. Personal suggestion: If you have a lot of rice in your hand, choose D700 to ensure that your camera will not lag behind for three years. If you are not an equipment person and don't have much money, you can consider the D90, because it is recognized as a camera with high cost performance. If you think the D90 is low-end, and the money for buying the D700 is not enough, buying the D300S is the best choice.
Dude, I'm hesitant about these three cameras. Originally, I paid for the D90, but I took a fancy to the D700. Fortunately, I calmed down. My mental journey at that time was: 1. Photography lovers don't have very high requirements for Quan Huafu and non-Quan Huafu, and they are afraid that all cameras will be wasted in my hands, so they are positioned in a non-full picture. I'd rather have a chicken head than a phoenix tail. D300S is the king of non-Quan Huafu. If you can make good use of this machine, you can buy D3X in Quan Huafu, or Sandu in C, if you have money. Why are you in such a hurry to buy D700? To tell you the truth, I feel great now with D300S! I don't envy people with invincible rabbit or D700. 3. But I have to say the lens. Non-Quan Huafu lens can't be used in Quan Huafu's camera, because it will produce dark corners. How can you keep intercepting pictures unless you intercept them at that time? Therefore, although the lens group of a non-full-frame camera is relatively cheap, you can buy D3X and other cameras in the future, and you can take these previously bought lenses to the second-hand market for sale. 4.4. You don't need to consider D90. No matter how high the cost performance is, it will cost money. Why buy an outdated model? Conclusion, buy D300S. D300S experience: 1, humanized. Don't underestimate the details of improvement, the details determine success or failure. 2, the fuselage quality is good. Although I also have a Canon machine, I still want to praise the good quality of Nikon. Although the image quality is largely determined by the lens, the function of this camera is impeccable. 4. Don't think that its video function is chicken ribs. Although I almost gave up the D300S at first because of the video function, I later learned that its video function has been playing well, which is particularly sensational because it supports manual video focusing. In short, for example, you can shoot the feeling of misty eyes. 5. Now the price of this machine has been reduced again, and the cost performance is higher! Quan Huafu's machine emperor!