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-   -   Rack focus (https://www.dvinfo.net/forum/canon-xl1s-xl1-watchdog/576-rack-focus.html)

gratedcheese December 29th, 2001 11:59 AM

Rack focus
 
Could someone please explain the term "rack focus." I've read the Michael Pappas article on the site; although the article describes how to attain rack focus, it really doesn't explain what it is.

I can only assume it is something akin to what still photographers do when trying to obtain the largest depth of focus -- ie, focusing on the subject, setting an f/stop and then sliding the focus ring indicator over to obtain a larger depth of field.

Can you obtain rack focus with the XL1S using the Optex Fujinon 14x lens?

Thanks for any help you might be able to give me!

-- Alan

Daniel H. Buchmann December 29th, 2001 04:01 PM

hey cheese,
I think rack focus is simply fixing the focus from one subject to another. Ex: Racking the focus from foreground object to background object. Hope that helps.

Ken Tanaka December 29th, 2001 04:43 PM

Daniel is correct. Rack-focus is, indeed, shifting the focus between a subject in the foreground and one in the background. Implicitly, the subjects are just outside the normal depth of field for the lens' settings in that shot.

Generally, as a practical matter, rack focusing is simpler to accomplish with a manual lens or an automatic lens that features a full-manual mode.

gratedcheese December 29th, 2001 09:56 PM

Ken, Daniel:

Thanks for your reply.

However, just to clarify that I understand what you're saying, is the following a rack-focus kind of event:

Scene: You have two people, both included in the frame of the shot, talking to each other. You start out focusing on the character FARTHEST from the camera. At some predetermined time, you shift the focus to the character closest to the lens, which puts the first character out of focus?

Am I getting close?

If that isn't a viable example, please do this idiot a big favor and give me a scenario.

Thanks, brothers!!

Ken Tanaka December 29th, 2001 10:34 PM

Exactomunde. Bingo. You've got it. Very good example, Alan.

Often you'll see this technique used to induce "Oooh's" or "Aha's" by showing the viewer something new in the frame. Also it's handy for showing another character's reaction.

Chris Hurd December 30th, 2001 12:13 AM

It's also a way to get movement within the frame without moving the camera or the subject. Definitely one of my favorite cinematic tricks,


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