Lens Question at DVinfo.net

Ron Edwards · July 29th, 2005, 11:42 AM

OK...here is the question. Lets say from a distance of 20 feet two camcorders are recording the same image. Both are zoomed in as tight as possible. One cam is the Cannon GL-2 and the lens is the standard 20x with the spec. of 4.2 - 84mm. The second cam is the JVC 5000 with the Cannon 16X lens with the spec. of 7 - 112 mm.

Which cam will show the largest image of our tiny subject?

Thanks in Advance!
Ron

Jack Smith · July 30th, 2005, 12:37 AM

The JVC will
EDIT Sorry everyone else is right.Don't know why I was thinking the JVC was 1/3".

Dylan Couper · July 30th, 2005, 01:03 AM

What's the image magnification factor on a 1/2" chipper like the JVC 5000 cameras? I would have figured the 1/4" chips on the GL would give a big enough magnification factor to give it longer reach even with the smaller glass. Good question though!

Dan Vance · July 30th, 2005, 02:37 AM

I think the easiest way to do these comparisons is to convert both to 35mm SLR equivalents. The Canon GL2 with 1/4" CCDs has a conversion factor of 10.9 and the 1/2" JVC is 5.5. At the maximum zoom of each of the the lenses:
GL2: 84mm x 10.9 = 915mm
DV5000: 112mm x 5.5 = 616mm
So the GL2 will show the largest image, by far.

Ron Edwards · July 30th, 2005, 08:24 AM

Any one have these two cams that can set up an actual test...seems like we have two different answers....

Thanks!

July 29th, 2005, 11:42 AM	#1
Ron Edwards Regular Crew Join Date: May 2004 Location: Fairview Heights, Illinois Posts: 148	Lens Question OK...here is the question. Lets say from a distance of 20 feet two camcorders are recording the same image. Both are zoomed in as tight as possible. One cam is the Cannon GL-2 and the lens is the standard 20x with the spec. of 4.2 - 84mm. The second cam is the JVC 5000 with the Cannon 16X lens with the spec. of 7 - 112 mm. Which cam will show the largest image of our tiny subject? Thanks in Advance! Ron

July 30th, 2005, 12:37 AM	#2
Jack Smith Major Player Join Date: Nov 2003 Location: ontario Posts: 445	The JVC will EDIT Sorry everyone else is right.Don't know why I was thinking the JVC was 1/3". Last edited by Jack Smith; July 30th, 2005 at 09:50 AM.

July 30th, 2005, 01:03 AM	#3
Dylan Couper Wrangler Join Date: Jun 2002 Location: Vancouver, British Columbia Posts: 8,314	What's the image magnification factor on a 1/2" chipper like the JVC 5000 cameras? I would have figured the 1/4" chips on the GL would give a big enough magnification factor to give it longer reach even with the smaller glass. Good question though! __________________ Need to rent camera gear in Vancouver BC? Check me out at camerarentalsvancouver.com

July 30th, 2005, 02:37 AM	#4
Dan Vance Built the VanceCam Join Date: Apr 2004 Location: Prescott Valley, AZ Posts: 109	I think the easiest way to do these comparisons is to convert both to 35mm SLR equivalents. The Canon GL2 with 1/4" CCDs has a conversion factor of 10.9 and the 1/2" JVC is 5.5. At the maximum zoom of each of the the lenses: GL2: 84mm x 10.9 = 915mm DV5000: 112mm x 5.5 = 616mm So the GL2 will show the largest image, by far.

July 30th, 2005, 08:24 AM	#5
Ron Edwards Regular Crew Join Date: May 2004 Location: Fairview Heights, Illinois Posts: 148	Any one have these two cams that can set up an actual test...seems like we have two different answers.... Thanks!