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The purpose of the arm is so that when you put your eye to the lens, that it doesn't move, and it holds the lens still so the image is not blurry.
Faraway objects are blurry
It appears to get bigger but, is still blurry.
A convex lens.
You need a type of lens that are called convex lens.
Diverging Lens are use (reading glasses) to help correct the problem of myopia helping fix the focus which causes items far away to seem fuzy and blurry.
The purpose of the arm is so that when you put your eye to the lens, that it doesn't move, and it holds the lens still so the image is not blurry.
Because they are worn out. You should dispose of them immediately, and get new ones.
Do you want a blurry photo, or are you trying to avoid a blurry photo?If you want a blurry photo: (You can)Move the camera as you shootShoot in low lightShoot quickly moving subjectsSet your lens out of focusUse a soft focus filter, or an ND filterPut Vaseline on the lens (Not recommended)If you don't want a blurry photo: (Don't do any of the above)Be careful not to shake or move the camera as you shoot (or use a tripod)Shoot where it is well lit (if possible)Shoot stationary subjects (if possible)Ensure your focus point is on your subject (for auto-focus)Ensure that the lens is cleanThese are some of the basics to consider
Faraway objects are blurry
obscure photograph
It appears to get bigger but, is still blurry.
You may also try cleaning the lens of your camera with rubbing alcohol and a lint free cloth or rotating the focus ring on the camera; see owners manual for location of focus ring. If the lens is dirty or has moisture or the focus ring is not correctly adjusted the picture will appear blurry.
His vision is blurry
If a person has blurry vision in one eye a monocle can improve it. Although the monocle was replaced with the contact lens.
It is like camera lens it become foggy and blurry and with surgery 9/10 people get 20/20 vision.
The simple microscope, defined as having one lens, was enhanced by Leeuwenhoek. Many of the compound (multiple lensed) microscopes were blurry, but Leeuwenhoek ground his own lenses.