Any HV20 latitude tests yet? at DVinfo.net

Brian Tori · May 19th, 2007, 06:04 AM

Has anyone performed tests using both normal and cinemode gamma yet? Also, I am looking for a chart that I can use for this purpose.

Bruce Allen · May 19th, 2007, 08:16 PM

Brian, there are many ways to test this, but you might want to look at the Stouffer T4110C step wedge.

I own a HV20 and a Stouffer chart and am going to do comprehensive tests when I have a free moment. Right now though, I am in the last stages of my homebuilt 10" HD LCD project and I really need to get that done first.

Bruce Allen
www.boacinema.com

Owen Meek · May 20th, 2007, 03:49 PM

but in the meantime i would like to entertain my thoughts with this chart http://dvinfo.net/conf/attachment.ph...0&d=1178608731
submitted by Noah Yuan-Vogel.

thread here..
http://dvinfo.net/conf/showthread.php?t=93493

Bruce Allen · May 27th, 2007, 05:07 AM

Did a REALLY quick test with the Stouffer wedge - didn't even import into the computer, just viewed it with my homemade 10.6" LCD monitor & the onboard (low-res) LCD with judicious zooming...

Latitude seems to be between 6 and 8.5 stops (maybe 9 if you're pushing it) depending on:
a) what settings you use - Tv mode with Vivid is more like 6 stops, Cine mode with Contrast at -1 is more like 8+ stops.
b) your noise threshold - past 8.5 it becomes difficult to distinguish tonal differences in Cine mode although you can definitely see it becoming darker overall... Definitely the part of the wedge that is 12 stops darker is darker than the part of the wedge that is 10 stops darker but it is too indistinct to really count.

I think that this basically matches up with Noah's original tests. Anyway, when I'm less tired, I'll do everything in a more controlled way. This camera rocks.

Cheers

Bruce Allen
www.boacinema.com

May 19th, 2007, 06:04 AM	#1
Brian Tori Major Player Join Date: Nov 2004 Location: Detroit, MI Posts: 408	Any HV20 latitude tests yet? Has anyone performed tests using both normal and cinemode gamma yet? Also, I am looking for a chart that I can use for this purpose.

May 19th, 2007, 08:16 PM	#2
Bruce Allen Regular Crew Join Date: Jun 2006 Location: Los Angeles, CA Posts: 43	Brian, there are many ways to test this, but you might want to look at the Stouffer T4110C step wedge. I own a HV20 and a Stouffer chart and am going to do comprehensive tests when I have a free moment. Right now though, I am in the last stages of my homebuilt 10" HD LCD project and I really need to get that done first. Bruce Allen www.boacinema.com

May 20th, 2007, 03:49 PM	#3
Owen Meek Regular Crew Join Date: Jul 2005 Posts: 69	but in the meantime i would like to entertain my thoughts with this chart http://dvinfo.net/conf/attachment.ph...0&d=1178608731 submitted by Noah Yuan-Vogel. thread here.. http://dvinfo.net/conf/showthread.php?t=93493

May 27th, 2007, 05:07 AM	#4
Bruce Allen Regular Crew Join Date: Jun 2006 Location: Los Angeles, CA Posts: 43	Did a REALLY quick test with the Stouffer wedge - didn't even import into the computer, just viewed it with my homemade 10.6" LCD monitor & the onboard (low-res) LCD with judicious zooming... Latitude seems to be between 6 and 8.5 stops (maybe 9 if you're pushing it) depending on: a) what settings you use - Tv mode with Vivid is more like 6 stops, Cine mode with Contrast at -1 is more like 8+ stops. b) your noise threshold - past 8.5 it becomes difficult to distinguish tonal differences in Cine mode although you can definitely see it becoming darker overall... Definitely the part of the wedge that is 12 stops darker is darker than the part of the wedge that is 10 stops darker but it is too indistinct to really count. I think that this basically matches up with Noah's original tests. Anyway, when I'm less tired, I'll do everything in a more controlled way. This camera rocks. Cheers Bruce Allen www.boacinema.com