Field of View comparisons, 20x vs. 6x at DVinfo.net

Chris Hurd · November 30th, 2006, 01:30 PM

Wide and telephoto comparison images from the XL HD 20x and 6x lenses. All of these still photos were shot at f/3.7 in order to maintain consistency throughout the spread; the max. aperture on the 20x lens at full tele is f/3.5 so that was my baseline for everything. Zero db gain. Shutter 1/30th. Subject is the Seminole Hard Rock in Hollywood, Florida. Full wide and full telephoto with both XL HD lenses, the 20x and 6x. Click thumbnails to see the full-size versions.

Compare these images with the same shots from an XH camcorder with and without the WA adapter:
http://www.dvinfo.net/conf/showthread.php?t=80691

Lauri Kettunen · November 30th, 2006, 01:50 PM

Quote:

Originally Posted by Chris Hurd

.Florida. Full wide and full telephoto with both XL HD lenses, the 20x and 6x.

Chris,

Thank you very much for posting the images. The first thing I wanted to check is, to which extent the new lens creates the magenta and green layers on the borders between dark and light regions like the 20x. Looking at the towers it seems such effects do appear also with the 6x lens. What is you impression, is this puzzling with the 6x lens when viewing the image in full rez from a reasonable distance?

Chris Hurd · November 30th, 2006, 02:25 PM

I have not seen these on an HDTV monitor. They're not from video; they're just still photo .JPG's that I recorded on an SD card using the still image record function. There wasn't even a tape in the camera.

Jon Bickford · November 30th, 2006, 03:19 PM

it's amazing that the 20x has more curvature/barrel distortion at full wide than the wide angle does! Where'd you get your hands on that bad boy chris? has it hit the street yet?

Richard Alvarez · November 30th, 2006, 04:24 PM

I'm not so sure the 20x has curviture at the wide end. The building ITSELF is curved pretty drastically.. the vertical lines seem to remain vertical.

Chris Hurd · November 30th, 2006, 06:00 PM

The building is curved, and I *thought* the tripod was level, but...

Jon Bickford · November 30th, 2006, 06:55 PM

well yeah, obviously the building is curved!

look at the straight edges of the walls at the edges of the frame, they curve slightly inward on the 20x, this is called barrel distortion and the 20x does have it, most large range zooms do. i have noticed it many times in the past and lining the 6x up against the edges of straight walls at DV expo i was very impressed that the 6x didn't exhibit much at all at full wide.

November 30th, 2006, 01:30 PM	#1
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Field of View comparisons, 20x vs. 6x Wide and telephoto comparison images from the XL HD 20x and 6x lenses. All of these still photos were shot at f/3.7 in order to maintain consistency throughout the spread; the max. aperture on the 20x lens at full tele is f/3.5 so that was my baseline for everything. Zero db gain. Shutter 1/30th. Subject is the Seminole Hard Rock in Hollywood, Florida. Full wide and full telephoto with both XL HD lenses, the 20x and 6x. Click thumbnails to see the full-size versions. Compare these images with the same shots from an XH camcorder with and without the WA adapter: http://www.dvinfo.net/conf/showthread.php?t=80691 Attached Thumbnails __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

November 30th, 2006, 02:25 PM	#3
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	I have not seen these on an HDTV monitor. They're not from video; they're just still photo .JPG's that I recorded on an SD card using the still image record function. There wasn't even a tape in the camera. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

November 30th, 2006, 03:19 PM	#4
Jon Bickford Major Player Join Date: Nov 2004 Location: Las Vegas, NV., Los Angeles, CA, Posts: 220	it's amazing that the 20x has more curvature/barrel distortion at full wide than the wide angle does! Where'd you get your hands on that bad boy chris? has it hit the street yet? __________________ Jon Bickford, Trepany Films San Pedro, CA Trephine001@aol.com

November 30th, 2006, 06:00 PM	#6
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	The building is curved, and I thought the tripod was level, but... __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

November 30th, 2006, 06:55 PM	#7
Jon Bickford Major Player Join Date: Nov 2004 Location: Las Vegas, NV., Los Angeles, CA, Posts: 220	well yeah, obviously the building is curved! look at the straight edges of the walls at the edges of the frame, they curve slightly inward on the 20x, this is called barrel distortion and the 20x does have it, most large range zooms do. i have noticed it many times in the past and lining the 6x up against the edges of straight walls at DV expo i was very impressed that the 6x didn't exhibit much at all at full wide. __________________ Jon Bickford, Trepany Films San Pedro, CA Trephine001@aol.com

November 30th, 2006, 04:24 PM	#5
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	I'm not so sure the 20x has curviture at the wide end. The building ITSELF is curved pretty drastically.. the vertical lines seem to remain vertical.