split screen effect at DVinfo.net

Ian Skurrie · June 4th, 2009, 10:04 PM

I, despite having such a lowsy run with the drop out issue with the HD 101, am considering the HM 700. Has anyone who has owned or operated a HM 700 seen any evidence of the split screen effect which has been in evidence in the HD series? Does anyone know whether JVC has actually engineered a solution for the split screen effect in the HM 700?

regards

Ian Skurrie

Tim Dashwood · June 4th, 2009, 11:00 PM

The design of the CCDs is exactly the same (2 x 480x720 chips,) but the split-screen was an issue that was taken care of back in 2006 by a revamped QC. Obviously some HD100 or 200 series cameras slipped through the cracks but we seldom hear of this problem on the GY-HD board now.

You asked if anyone has seen evidence of it. I have... under extreme circumstances (available light on my residential street at 2-3AM with +9dB gain and gamma cranked up.)
You can see for yourself if you download my night tests.
http://www.dvinfo.net/conf/jvc-gy-hm...ior-tests.html

If the slight appearance of the "split-screen" can only be invoked under these extreme conditions then I would say the issue has been resolved on JVC's end.

Ian Skurrie · June 7th, 2009, 11:55 PM

Quote:

Originally Posted by Tim Dashwood

The design of the CCDs is exactly the same (2 x 480x720 chips,) but the split-screen was an issue that was taken care of back in 2006 by a revamped QC. Obviously some HD100 or 200 series cameras slipped through the cracks but we seldom hear of this problem on the GY-HD board now.

You asked if anyone has seen evidence of it. I have... under extreme circumstances (available light on my residential street at 2-3AM with +9dB gain and gamma cranked up.)
You can see for yourself if you download my night tests.
http://www.dvinfo.net/conf/jvc-gy-hm...ior-tests.html

If the slight appearance of the "split-screen" can only be invoked under these extreme conditions then I would say the issue has been resolved on JVC's end.

Thanks Tim, from your test footage, for all practical purposes, I would think that the problem is resolved, which is good news.

regards
Ian Skurrie

Les Howarth · June 8th, 2009, 02:39 AM

I have been using a 100(a) for over 3 years now and have not had a split occur in actual shooting conditions, including available light work documentary-style in offices, large not well lit meeting rooms etc. with window or just high up room lights which can be pretty dull.

I can produce it on demand by putting the camera under my desk with no or little light where the combination of low light + low contrast will bring it out due to not enough information for the cpus to calibrate and balance.

But under the conditions of real work it has never happened.

Alex Humphrey · June 8th, 2009, 07:06 AM

I have a HD110, and I CAN get it if I record before the unit warms up and have the gain +9 or higher. Once it's warmed up though even on max gain, it usually dissapears. But I rarely gain over +9 anyway.

In fact I've noticed that that (horrors!) the AGC (is that right or am I using the terminology from the HD10?) when I select it as my max gain, gives a suprisingly good image (usually better than my low light level tweaking) at super low light scenes where I have no control over lighting. Again, when it was warmed up the split screen dissapeared ALWAYS on the auto gain circuit.

So I'm sure you could force a new HM700 in the first 5 minutes to show split screen, otherwise I'm assuming (I don't have a HM700 yet) we wouldn't have any problems.

June 4th, 2009, 10:04 PM	#1
Ian Skurrie Regular Crew Join Date: Jun 2007 Location: Mooroolbark, Victoria, AU Posts: 63	split screen effect I, despite having such a lowsy run with the drop out issue with the HD 101, am considering the HM 700. Has anyone who has owned or operated a HM 700 seen any evidence of the split screen effect which has been in evidence in the HD series? Does anyone know whether JVC has actually engineered a solution for the split screen effect in the HM 700? regards Ian Skurrie

June 4th, 2009, 11:00 PM	#2
Tim Dashwood Wrangler Join Date: Aug 2005 Location: Toronto, ON, Canada Posts: 3,637	The design of the CCDs is exactly the same (2 x 480x720 chips,) but the split-screen was an issue that was taken care of back in 2006 by a revamped QC. Obviously some HD100 or 200 series cameras slipped through the cracks but we seldom hear of this problem on the GY-HD board now. You asked if anyone has seen evidence of it. I have... under extreme circumstances (available light on my residential street at 2-3AM with +9dB gain and gamma cranked up.) You can see for yourself if you download my night tests. http://www.dvinfo.net/conf/jvc-gy-hm...ior-tests.html If the slight appearance of the "split-screen" can only be invoked under these extreme conditions then I would say the issue has been resolved on JVC's end. __________________ Tim Dashwood

June 8th, 2009, 02:39 AM	#4
Les Howarth Regular Crew Join Date: Oct 2005 Location: Manchester England Posts: 40	I have been using a 100(a) for over 3 years now and have not had a split occur in actual shooting conditions, including available light work documentary-style in offices, large not well lit meeting rooms etc. with window or just high up room lights which can be pretty dull. I can produce it on demand by putting the camera under my desk with no or little light where the combination of low light + low contrast will bring it out due to not enough information for the cpus to calibrate and balance. But under the conditions of real work it has never happened.

June 8th, 2009, 07:06 AM	#5
Alex Humphrey Major Player Join Date: Mar 2007 Location: california North and South Posts: 642	I have a HD110, and I CAN get it if I record before the unit warms up and have the gain +9 or higher. Once it's warmed up though even on max gain, it usually dissapears. But I rarely gain over +9 anyway. In fact I've noticed that that (horrors!) the AGC (is that right or am I using the terminology from the HD10?) when I select it as my max gain, gives a suprisingly good image (usually better than my low light level tweaking) at super low light scenes where I have no control over lighting. Again, when it was warmed up the split screen dissapeared ALWAYS on the auto gain circuit. So I'm sure you could force a new HM700 in the first 5 minutes to show split screen, otherwise I'm assuming (I don't have a HM700 yet) we wouldn't have any problems.