You can avoid the crash and side effects by using energy drinks that provide high doses of B12 only. Vitamin B12 in high doses even does not harm your body. I have taken like 4500% Vitamin B12 without ill effect :)
I have an 18x optical zoom camera and am considering getting a 42x optical zoom now. My problem is when I zoom to far away subjects, the pictures are not as clear as I'd like them to be and of course flash is not an option in this case. Any advice on how I can get sharper images at these far ranges?
Devanand, a couple things worth trying are, try keeping the camera steady when focusing at longer distances. You can accomplish this by, using your environment to steady your shot, lean on a wall perhaps. Also the use of a tripod or monopod can help. Khemraj is somewhat right, try shooting during peak hours, sunsets and sunrises also give adequate lighting. Use faster shutter speeds and a combination of a mid range ISO.
Devanand, it all depends on what you are trying to portray as the photographer. For example the "Boat" photo at #1 was taken to relate a sense of peacefulness to the viewer so overall the entire image is kept in focus.
To quote your terminology "Perspective blurring" is a useful tool in photography, known as Depth of Field. This allows the photographer to guide the viewer to what should be in focus, ie, the main focal point or reason for taking the shot.
You can prevent or minimize it but shooting with a smaller aperture (a higher F number).