I was looking through my digital picture collection earlier, and I was reminded by something I have noticed before, which is some of the first digital pictures I’ve taken (way back in like 2000) have some major distortion caused by the camera lens. Back then I was new to digital photography, and i had a cheap digital camera that was bought from our ISP at the time which was EarthLink.
Here is a photo of me from may 2001, in which you can see the distortion:
Ha, i dunno what i was doing in the picture. striking a pose i guess? ha
You can see how the mirrors in the background are kinda round at the top, and also the side of the door is kinda bent. Has a bubble effect kinda.
So i easily fixed the distortion by going to: Filter > Lens Correction
And you should get a window that looks like this:
(click thumbnail to see larger image)
If you have earlier version of photoshop you can access the lens correction by: Filter > Distort > Lens Correction.
So, there are pre defined settings, and it works pretty good on certain model of cameras and lens, which will allow you to use predefined fixes.
The camera i used though is a old cheap one, so they wouldn’t have that setting saved. I just messed with the first setting, and moved it up. I think for most users this will be the only setting that you need to mess with, but for more advanced cases you may need to adjust the horizontal, or vertical tilt.
It’s actually super easy because it shows the correction in real time. It also helps to enable the grid, which helps you be aware of how straight the lines are in the image. That option is the third button on the top left of the window.
So here is the corrected picture:
Ha, oh yeah, the door was actually broken and just sitting there, so its not a part of the distortion 
Anyways, its a cool feature that will come in very handy if you noticed any type of distortion in your photos.
