I've used a 200 mm lens on a 35 mm camera for track events and football. It is a little long for portrait work, but may work OK for random candid people shots.
The Canon AE1 lens will not fit a Canon digital. You can buy an adapter that will allow the lens to work in manual focus mode on the digital camera.
Yes, you can. Any EF and EF-S lens will work on 20D.
It is not recommended to use a different model camera lens on a camera. Camera's and accessories such as camera lens are made by manufacturers to support their own products. Use of an sony camera lens on a differen model camera may void the warranty.
No. Camera bodies are manufactured with a variety of lens fittings and only accept lenses with a compatible connector.
It depends if the camcorder has the physical settings to attach the lens.
Yes, there are different camera lens' for different cameras. Not all cameras have different camera lens' though and that is because they have an automatic focus. A more detailed and expensive camera should have different lens' since they are for more detailed photographer work than for the regular consumer.
It all depends on the kind of digital camera you have, if the lens mount is the same on both of the cameras, then the lens will work (Minolta and Sony are interchangeable) Off camera flashes may also work, again depending on the kind of camera(s). And of course, film wont.
If you are transferring it onto a camera with the same mount then yes. But be aware AUTO FOCUS MAY NOT WORK CORRECTLY. The aperture of the lens may not be as good either. But overall you should be OK. Good Luck
Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Also you can try twisting the camera lens clockwise gently and it will go down. Do not push it down or else you will break it. Then try turning it on. It might work. There are several things that you can do to try to correct it. These home fixes seem to work for less than 50% of the lens errors. If the camera is out of warranty, they're worth a try. See the below related link "Fixing a Lens Error on a Digital Camera":
Yes, that will work fine. Dos not work the otherway around.
A zoom lens is a lens of a camera which contains a mechanical assembly of inner lenses, which allow the focal length of the camera to be rapidly altered.
You would have to use a Minolta SLR digital camera with a Minolta lens. However, don't automatically assume an old Minolta lens will work on a digital camera. You need to determine whether the digital camera accepts interchangeable lenses and whether it accepts the specific Minolta SLR lens and mount you have. There is no real generic answer to this question.