A-Class Visual Design

Slr Auto Focus

Can you use a certain kind of lens with a manual focus camera that automatically auto focuses it?

Can you use a certain kind of lens with a manual focus camera that automatically auto focuses it?

(I'm talking about manual SLRs that are able to have autofocus throughout the whole picture, like this:

http://adsoftheworld.com/files/images/OlympusFocus.preview.jpg

and not with this sort of effect:

http://www.photoreview.com.au/reviews/advanced/manual_focus.jpg

?)

Keep in mind that I'm using a manual focus SLR and want to achieve a clear crisp image throughout the whole photo.

I think you have confused Depth of Field (DOF) with autofocus. The first picture you linked has deep DOF while the second has shallow DOF.

As someone already pointed out, DOF is dependent on three factors:

1) The focal length of the lens
2) The f-stop chosen
3) Subject distance

For an explanation of DOF, visit http://www.dofmaster.com/dofjs.html The site also features a DOF Calculator that you can use to compute DOF for any combination of f-stop, subject distance and focal length.

An older SLR like a Minolta SRT-202 or Pentax K1000 or Canon FTb is manual focus only. Vivitar tried building lenses with a focusing motor to "convert" the older manual focus cameras to a kind of autofocus but they weren't very popular and were quickly abandoned.

Autofocus: DSLR Know-How with Tamron Episode 2

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