I have heard some of my friends and people asking, how to shoot blur free shots. My answer would be... quite difficult... you might have to make do with some of the blur.
Well... there are a couple of blur that will be seen in your photo.
1) Motion blur from your subject... unless you are shooting at something that are completely stationary, there will be some movement from your subject. Many people had said that shooting subject like the moon and the sun should not have any movement... well, I would tell them that that is one big crap. Moon move too, it revolve around the Earth, so there are relative movement. Same as the sun, but in the sun case, Earth revolve around the sun, so the Sun is actually stationary, but the Earth moved. Either way, if you are shooting at very long exposure, you will see blurriness of these object deal to their movement.
2) Movement of your lens and camera body due to vibration caused by external forces (hand shivering, ground shaking, depression of shutter by your hand, etc, etc). This would definitely cause some to alot of blur in your photo.
3) Movement of your lens and camera body due to vibration caused by internal mechanism of your camera, eg. mirror flipping.
Well, for the first type of blur, basically the only way to stop the blur is to shoot at fast enough shutter speed. This would freeze the motions of your subject. However in certain cases, it is not easy to achieve that type of shutter speed that you wanted, so there are two way to do it... using an external flash (note most external flash had a sync up speed of around 1/200 to 1/250sec, however some flash did provide a high-speed sync or they actually shoot a burst of flashes, but these flash power is not high enough to be thrown very far), pumping up your ISO value to pretty high so as to achieve that desirable shutter speed and/or open your aperture wider.
For the second type of blur, modern innovation can help some. Many of the new DSLR came with sensor swift vibration control system, this could enable the camera to achieve some forms of stabilizing system to prevent slight vibration and allow you to shoot at lower shutter speed, other DSLR system had stabilizing system build into some of the lenses... this system allow the lenses to compensate the shake with a counter shake or vibration from an inbuilt motor to achieve stabilization...
The third type of blur could be countered with executive mirror lock and lesser contact of the camera by user, using a remote control.
Anyway for the last two type of blur, there are other external systems that can be used to help... one of them being a tripod and another was the monopod.
As for the tripod, a good and stable one is very well appreciated... however even when your camera is place on a tripod, they will still move, depending on the ground the tripod is standing on and/or the stability of your tripod. If you are on the field, filming or shooting photos of charging bulls or rugby players... the very ground tremembled at the force of the charging animals... so even if you have a very stable tripod, it might not help, so you need either sensor shift stabilizing system or lens based stabilizing system to counter this vibration.
The second form of stabilizing is by making use of a monopod. Although a monopod can never achieve the same stability as a tripod, but it is lighter, smaller and easier to move around with a monopod... also it take a much lesser time to deploy. From my personal experience, a monopod can achieve what a lens stablizing or sensor base stabilizing system can do.
So you would ask, wouldn't a monopod be better than to pay premium for a stabilize lenses... well... I wouldn't say that. A monopod no matter how small, can still be a hassle moving around... especially when you are shooting in a fast pace area... or shooting photos in some typical genre like the street photography.
So in conclusion, there are a couple of way to prevent blurriness... but first you must identify what is the cause for the blur... before determining what action to take or any action at all...
From my experience, sometime blurriness of the picture can be pretty nice... it actually show some speed of your object...
Other than that, try to stabilize your setup using monopod, tripod or stabilized lens/ body...
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