Thank you sir, I will retry with the new tips, appreciate your time
I dumped canon because of its toy camera feeling and noisy shutter. Baby wakes up every time I clicked with it lol
Have a good day ahead.
Here are some tips that I find useful.
Roughly speaking, the amount of light hitting the sensor is called "exposure". A photo is "correctly exposed" if the amount of light is just right in bringing out all the details of the scene. Too much and the photo is "over exposed". Too little, it is "under exposed". Your camera has a meter that checks if it is correct.
Three things determine exposure: aperture, shutter speed, and ISO sensitivity. To achieve the same amount of light, different combinations of these 3 can be used. However, the different combination has other effect on your photographic outcome. Aperture affects depth of field (your "bokeh" effect). Shutter speed affects motion blur. ISO affects "graininess" - noise.
For the D7000, here are some useful tip:
1. For ISO, go as low as possible. But do not exceed 1600. I find that the noise above 1600 is quite bad in general. Depending on the scene composition, lighting condition, and how desperate you are in getting the shot, ISO 3200 is ok-ish.
2. For shutter speed, as mentioned, ensure at least it is 1/f where f is the focal length. But do remember the 1.5x crop factor. So if you are at 100mm, then you have to multiply by 1.5 and have the shutter speed to be at least 1/150. With VR, and a very steady hand, you may be able to cheat a notch or two on this. But if your subject is moving, then you have need a faster shutter. My experience with birds, for example, need at least 1/500 sec or more to "freeze" the motion.
3. For aperture, bear in mind that lenses are generally sharpest one-stop or two lower. For the lens you are using, I suggest you google for the technical charts that people obtained from testing. It will give you an idea which f-number for your particular lens is the sharpest. "Sharpest" means that, for example, lines are well defined, or the transition from the black part of a thick line to the white background is well defined instead of blurry. However, sometimes, bokeh matters more. Your judgement call.
Generally, I use "A" mode to get the depth of field I want, then let the camera meter and see if the shutter speed is good enough (the exposure bar should read zero or near zero). If not, bump up the ISO.
Hope this helps.