1/25th shutter speed = half resolution? 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 XL and GL Series DV Camcorders
Canon XL2 / XL1S / XL1 and GL2 / XM2 / GL1 / XM1.


Reply
 
Thread Tools Search this Thread
Old November 17th, 2004, 09:10 AM   #1
New Boot
 
Join Date: Sep 2004
Location: Venice, Italy
Posts: 23
1/25th shutter speed = half resolution?

Shooting at 1/25th shutter speed on 25p PAL will give more motion blur BUT will cut the resolution?

TIA,
Asa
Asa Phelps is offline   Reply With Quote
Old November 17th, 2004, 09:24 AM   #2
Trustee
 
Join Date: Jul 2004
Location: Canton, Ohio
Posts: 1,770
Re: 1/25th shutter speed = half resolution?

<<<-- Originally posted by Asa Phelps : Shooting at 1/25th shutter speed on 25p PAL will give more motion blur BUT will cut the resolution?

TIA,
Asa -->>>

It should not cut the resolution. In theory. Unless Canon did something "whack" here it should still be full resolution.
Marty Hudzik is offline   Reply With Quote
Old November 17th, 2004, 09:25 AM   #3
Inner Circle
 
Join Date: Jun 2004
Location: Belgium
Posts: 2,195
I don't think so.
Are you asking if you film at a 1/25th shutter speed you loose half of your resolution? No, I'm actually pretty sure that isn't so.
Mathieu Ghekiere is offline   Reply With Quote
Old November 17th, 2004, 09:27 AM   #4
Major Player
 
Join Date: Aug 2004
Location: Tampere, Finland
Posts: 443
You mean, the spatial resolution depended on the shutter speed? If so, this is not the case. The spatial resolution is constant for all shutter speeds. But as you say, longer shutter speed imply the objects in motion appear less sharp.
Lauri Kettunen is offline   Reply With Quote
Old November 17th, 2004, 09:32 AM   #5
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Welcome aboard DVInfo.net Asa!
__________________

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 November 17th, 2004, 09:43 AM   #6
New Boot
 
Join Date: Sep 2004
Location: Venice, Italy
Posts: 23
Thanks,
I remember that with XL1 has been said shooting at 1/25th would have cut in half the resolution..
Maybe was just the blurring effect of the slow shutter that made objects appear less sharp

Asa
Asa Phelps is offline   Reply With Quote
Old November 17th, 2004, 10:36 AM   #7
Major Player
 
Join Date: Sep 2002
Location: Belgium
Posts: 804
Indeed Asa, besides motion blurr (when there is motion in the pic) in 1/25 (1/30) mode and lower, your cam just outputs only one of the two fields. the field is being repeated to form an interlaced frame. So you get only get 50% vertical resolution.
Andre De Clercq is offline   Reply With Quote
Old November 17th, 2004, 04:08 PM   #8
Major Player
 
Join Date: Oct 2002
Location: Montreal, QC, Canada
Posts: 570
Asa, maybe you mean (or you've heard) shooting in the frame mode (fake 25p), which on the XL1 meant losing resolution. But 25p on the XL2 is true progressive, meaning you won't lose any resolution. The XL2 uses true progressive scan CCDs, not the XL1.
David Lach is offline   Reply With Quote
Old November 17th, 2004, 04:59 PM   #9
Barry Wan Kenobi
 
Join Date: Jul 2003
Location: North Carolina
Posts: 3,863
On the PD150 and other interlaced cameras, yes using a slower-than-field-rate shutter speed would cut the resolution in half.

On the DVX (and presumably the XL2) you still keep full resolution, even as low as 1/6 of a second.
Barry Green is offline   Reply With Quote
Old November 17th, 2004, 05:17 PM   #10
Major Player
 
Join Date: Sep 2002
Location: Belgium
Posts: 804
Could well be indeed that cams which have proscan mode also keep their resolution in slower- than-FIELD-rate shutterspeeds
Andre De Clercq is offline   Reply With Quote
Old November 17th, 2004, 08:51 PM   #11
Barry Wan Kenobi
 
Join Date: Jul 2003
Location: North Carolina
Posts: 3,863
Right -- sorry for the wrong word, I changed it to avoid confusion.
Barry Green 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

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:20 AM.


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