Depth-of-Field at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Canon XL1S / XL1 Watchdog
Can't find it on the XL1 Watchdog site? Discuss it here.


Reply
 
Thread Tools Search this Thread
Old January 28th, 2002, 02:01 PM   #1
SFSchneider
 
Posts: n/a
Depth-of-Field

Does anyone know where I might get depth of field charts for the XL1s with the 16x 5.5-88mm lense? Or does anyone know the circle of least confusion for the XL1s image sensor?
  Reply With Quote
Old January 29th, 2002, 12:57 PM   #2
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 26,900
Images: 513
I think this will be a tough request to fill due to the way that lens works, but I'll try to check my sources.
__________________
CH

Search DV Info Net | DV Info Net Sponsors | A Decade (+5) of DVi | ...Tuesday is Soylent Green Day!
Chris Hurd is offline   Reply With Quote
Old January 30th, 2002, 06:47 PM   #3
Mad Scientist
 
Join Date: Jan 2002
Location: Austin, TX
Posts: 47
I've been working on a depth-of-field calculator for the XL1 ... the problem is determining the true image size of the sensor. The way the lens works may or may not be a problem.

Hey Chris, since you know some of the Canon folks, would you pump them for this information? It would be really helpful for us DPs out here who are trying to create stunning images with this beast.

Thanks!
Kevin Triplett is offline   Reply With Quote
Old January 30th, 2002, 11:52 PM   #4
SFSchneider
 
Posts: n/a
I just recently noticed that the focus ring is "tweaky". As if it wasn't bad enough there are are no distance markers, I found that I can't mark the ring manualy, if i get a good focus and mark it with tape, adjust the focus and then move back to the marker, the focus isn't maintained. This is becoming a Pain, and i really can't afford the manual servo lense. :( A D-o-f calculator under these conditions might be tricky.
  Reply With Quote
Old February 5th, 2002, 03:17 AM   #5
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
I found this on the web:

---
For Canon XL-1 Wide Angle

F4 with subject at 3m depth of field is 1.4m-infinity
F4 with subject at 2m depth of field is 1.2m-19m
F4 with subject at 1m depth of field is .8m-2m

F5.6 with subject at 3m depth of field is 1.2m-infinity
F5.6 with subject at 2m depth of field is 1m to infinity
F5.6 with subject at 1m depth of field is .7m-3m
---

I assume they are talking about the 3x lens here
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old February 5th, 2002, 09:44 AM   #6
Trustee
 
Join Date: Oct 2001
Location: Chigasaki, Japan.
Posts: 1,660
The reason your focus isn't maintained is because there is no mechanical link between the focus ring adn the focus mechansim. It's servro operated, all the ring does is tell the servo to shift the focal plane.

There are cheaper manual lens options, the Fujinon 14x. You can pick one up from ZGC, one of Chris's sponsors for around a grand US. There are a few second hand ones around to now the 16x Canon lens is available.
Adrian Douglas is offline   Reply With Quote
Old February 5th, 2002, 09:47 AM   #7
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 26,900
Images: 513
Kevin -- my next opportunity to enter Canon-space is Feb. 11th at the New York DV Conference; will try to get this answered there.
__________________
CH

Search DV Info Net | DV Info Net Sponsors | A Decade (+5) of DVi | ...Tuesday is Soylent Green Day!
Chris Hurd is offline   Reply With Quote
Old June 7th, 2007, 04:08 AM   #8
New Boot
 
Join Date: Sep 2004
Location: Budapest, Hungary
Posts: 6
http://arenafilm.hu/dof.php
Gabor Kertai is offline   Reply With Quote
Old June 7th, 2007, 09:00 AM   #9
Mad Scientist
 
Join Date: Jan 2002
Location: Austin, TX
Posts: 47
Awesome! Thanks, Gabor
Kevin Triplett is offline   Reply With Quote
Old June 7th, 2007, 12:23 PM   #10
Regular Crew
 
Join Date: May 2007
Location: Kent, England
Posts: 134
im kinda new to cameras although im getting there mainly through trial and error and reading books, but can someone help me with the table on the link?

Ive been trying to get depth of field to work well with my XL1 but have found that I must have the lens zoomed in close to enable any kind of focus change.

Could someone help me out and tell me how to read the table and which bits are important that would be really great.

Thanks.
Richard Grebby is offline   Reply With Quote
Old June 7th, 2007, 12:44 PM   #11
Mad Scientist
 
Join Date: Jan 2002
Location: Austin, TX
Posts: 47
You do have to zoom in to get a change in focus between near and far objects. And the wider the aperture/iris, the more this change in focus becomes.

The chart has an explanation in the upper left box. It's terse but looks complete. Basically, for the aperture setting and the focal length setting, the near and far focus distance and everything in between is in reasonable focus.

At the bottom of the page are links to other cameras/lens setups.
Kevin Triplett is offline   Reply With Quote
Old June 8th, 2007, 07:03 AM   #12
Regular Crew
 
Join Date: May 2007
Location: Kent, England
Posts: 134
I feel like its one of those things that becomes natural when setting the camera location up.
I'll do some tests and have a mess around.

The thing im trying to is rack the focus from one face to another when two people are standing next to each other.

Maybe the best way is to do it using afteraffects....
Richard Grebby is offline   Reply With Quote
Old June 8th, 2007, 09:52 AM   #13
Mad Scientist
 
Join Date: Jan 2002
Location: Austin, TX
Posts: 47
Yes, after effects would do the trick -- means more work but if you have control over the where the two faces are in the frame, you can minimize the amount of work. But you have to consider the background and how it looks as you simulate rack focus.

Another way to do rack focus is to let the camera do it for you -- focus on one of the faces and then let the auto focus focus on the second face. Would mean panning or setting up the shot so that the second face is the one the camera *wants* to pull into focus. Would have to do it several times before you get it right.

If you have access to a manual lens, it's *much* easier. But if you have a good monitor, you can rack focus the standard lens, it's just more tricky, you have to practice it and turn the ring at the same speed each time. If you're filming a scripted scene, you run the risk of losing a good take with a botched rack focus. Ah, the joys of servo focus!

Wait a tick -- did you say "standing next to each other?" That's odd, it's terribly difficult to rack focus between two people standing next to each other. I'm sure you are describing something else, surely they are standing next to each other but are actually at different distances to the camera? Otherwise, you would totally have to do it in after effects and then you wouldn't have to worry about how it looks, cause it would probably look surreal regardless. :)

Last edited by Kevin Triplett; June 8th, 2007 at 09:56 AM. Reason: Fogot to mention something...
Kevin Triplett is offline   Reply With Quote
Old June 13th, 2007, 06:53 AM   #14
Regular Crew
 
Join Date: May 2007
Location: Kent, England
Posts: 134
sorry I ment when one person is standing closer to the camera. Its just something I need to work on I guess.
__________________
--Canon XL1--
http://www.richardgrebby.co.uk
Richard Grebby is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon XL1S / XL1 Watchdog

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:27 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network