Have pentax x90 when using zoom to max camera shakes and picture is blurry do we need a tripod

Not knowing exactly what coolpix you have, I only can give a general answer.
Be aware that most coolpix cameras with zoom have Vibration reduction. Always when you put a camera on a tripod, you should switch of the Vibration reduction. (even on the most expensive cameras or with a DSLR on its lenses)
Because when the vibration reduction is on, there is a part in the lens that is always moving and the movement will be guided in the correct direction when the detector senses a movement.
When you use a zoom lens it is wise to switch the vibration reduction on, as soon as you are taking pictures without tripod. It can compensate shake of the camera, so you can shoot with slower shutter speeds as without the reduction. But the pictures are never as sharp as shot from a tripod, without vibration reduction.

The Nikon Coolpix L810 is a great camera capable of taking very good and sharp pictures, even in bad light conditions. It has a Vibration reduction, that makes it even possible to shoot pictures without tripod when you zoom in very far. If normally with the same lens length you should need 1/200 of a second your camera should still be capable of taking that picture with only the same blur from shake, with 1/50 of a second. But if you ever should use a tripod. make sure you switch off that feature. Because the Vibration reduction, works with a staking lens element. that should compensate the movement of the camera, by shaking in the correct direction opposite to the movement of the camera. The element will still shake and so blur a picture, when the camera is placed on a tripod.
Don't try to shoot pictures with the zoom on full extension, in bad light conditions. That also won't work. Lots of things can be done with the camera, but to everything is a limit. Most of the time that limit comes sooner when there is less light.

What setting is the camera on, if there is a sports mode, use that or if there is an auto but sometimes auto doesn't work the way you want it. The other answer is to use a tripod.

Try adjusting the viewfinder diopter as described on page 50 of the manual: http://www.pentax.jp/english/support/man-pdf/x90.pdf

Try adjusting the viewfinder diopter as described on page 50 of the manual http://www.pentax.jp/english/support/man-pdf/x90.pdf

What camera are you using? Generally, when a camera is zoomed in like a telescope, it's difficult to keep the scene steady. When photographing a still shot, the camera will in most cases compensate for the shaking by selecting a faster shutter speed. You can over-ride these in several ways, but that's for another message. When videoing, especially indoors, the camera will shoot at slower shutter speeds, and wider lens opening. Zooming in, like a telescope, creates the shake. Suggest that you shoot with the zoom all the way out (wide angle instead of telephoto), and get closer to your subject. Also placing the camera on a tripod or mini tripod, will steady the shot.

Probably because at the longer end of the zoom range you are getting camera shake. On the wide angle setting shake will not be nearly so noticeable. Use a tripod for long telephoto shots or practise squeezing the shutter release really gently-like the trigger on a gun ;-)

If you are at maximum zoom ther likelyhood is that the shutter speed it long and you have camera shape coming in with will be amplified at high magnification.
Try shorter Zoom and non zoom pix they are Ok - then it is the camera shake thing.
A Tripod or a place to hold the camera steady is the remedy.

What you are experiencing is a phenomenon called camera shake. Camera shake is caused when there isn't enough light for the camera to set a fast shutter speed. The camera's shutter opens and has to stay open for up to several seconds for enough light to hit the CCD to capture the image. Most people cannot hold a camera perfectly still for more then 1/60th of a second. In addition, when the telephoto feature is used on an Ultra Zoom camera, the field of view becomes smaller. Since a lens with a large focal length provides a small picture area, even slight imperceptible camera movement will cause a blurred picture. To reduce camera shake, try one or more of the following when applicable: Change to a fast shutter speed. Put the camera on a flat surface or use a tripod. Brace yourself against a tree or wall. Put the camera in sports mode. For situations with low light, raise the ISO. (Please note this will impede image quality)

What you are experiencing is a phenomenon called camera shake. Camera shake is caused when there isn't enough light for the camera to set a fast shutter speed. The camera's shutter opens and has to stay open for up to several seconds for enough light to hit the CCD to capture the image. Most people cannot hold a camera perfectly still for more then 1/60th of a second. In addition, when the telephoto feature is used on an Ultra Zoom camera, the field of view becomes smaller. Since a lens with a large focal length provides a small picture area, even slight imperceptible camera movement will cause a blurred picture. To reduce camera shake, try one or more of the following when applicable: Change to a fast shutter speed. Put the camera on a flat surface or use a tripod. Brace yourself against a tree or wall. Put the camera in sports mode. For situations with low light, raise the ISO. (Please note this will impede image quality)