Does not focus after "far" objects when zoomed to 50mm or more ...

Focusing is one of the most difficult parts for every digital camera. Special on the end of the moon, and if the lights are low. Every camera needs sharp contrasting backgrounds and no distracting other high contrast objects in the foreground.
Be aware when you soon in to the end of the zoom range, you can't focus on close objects. Minimum focus distance can be a few meters.
It could be you switched to silence the focus noise, what can be bad for focusing.
See what the manual is telling you about zoom and focus:


Read the manual again, and check what settings would be the best for you while shooting video with a long zoom setting.
Here is the manual:
http://downloadcenter.samsung.com/content/UM/201405/20140522111801989/WB1100F_UM_English.pdf

Your lens elements are not moving smoothly. Maybe gummed up.

Hi, It wouldn't autofocus on the D5000 as the body doesn't have an auto focus motor in the body and since that lens is AF, not AF-S, it won't autofocus. It should autofocus on the D7000 though, how far away are you from the object you're trying to photograph?

most cameras come with an option called macro,this setting is for close up shots.on your camera it needs to set at wide angle.when choosing the shooting mode move left or right and choose the icon of a flower.if you adjust the zoom, a zoom bar will appear at the top of the lcd.if you try to use a zoom not intended for macro shots the flower icon will gray out and the bar will appear yellow,if you take a picture with the yellow bar it will be blurry.if you zoom out a little until it stops you should be ok. if you use a flash in macro mode the images edges usually will darken.hope this helps.

Your auto-focus is not working. Inside the camera is a motor that adjusts the lens to focus on an object automatically. It is currently stuck to "close" or near focus. However, it doesn't go far focus. Check the focus functions of you camera - try to use manual focus.

yes thats a fair bet,,, it could only be the lens that took the brunt of the smack it had and its now jamming when you try to focus up on close ups,,,
try a difrent 50mm lens on it and find out if im right

Your question ( in laymans terms) is unclear! But I will make a guess as to what it is you ask.

The 100-400mm is the focal length of the lens, To use it it has to be attached to the camera It it is capable of focusing clearly on an object at its maximum output as well as its minimum. At its maximum focus it can perhaps ( depending on optical quality) bring an object 4-5 Kilometers into clear view. Most lenses have a zoom factor and a focus ring. Experimentation with the lens will be a better way of defining what improvements it has over a standard 50mm lens

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Is this the 28-80mm G lens? I have had some experience with this lens and it has always been soft at wide angles.

Try this first.

Set your lens focus to infinity and focus your screen at a far away object (like a distant lampost). If it,s not in focus, then you have a misaligned mirror. Adjust your mirror so that a infinity setting, the split-screen image merge well to form a well focussed image. Hope that helps.

I have the same problem and the lens won't retract in.