Is -6dB gain actually 0dB gain, in disguise?
Setting the Z7 to -6dB just produces a cleaner, less noisy image, over 0db. Have sony just sneeked in 6dB calling it 0dB on the Z7, to improve the low light performance?
-6db HDV Progressive (not 25pscan) produces really quite good image :) |
0db simply means "default". Every other setting is just relative to the default.
|
It's a sneaky way to appear to have improved low light performance at 0db. Poor, cynical behaviour by Sony. I find the noise at 0db unacceptably high and shoot at -6db whenever possible.
|
Quote:
|
yeah could set all gain settings to -6dB, also use zebras to get a, say, 75% reading for faces
|
I set gain settings to -6, 0 & 6, which I feel equates to 0, 6, & 12 as I understand it. Don't get me wrong - the image is great at -6db - I just feel it's a really cheap trick that Sony have pulled here.
|
Quote:
Bruce Cleveland |
Hi Bruce - I'm not sure what you mean. I shoot a lot with available light and I'm shooting everything at -6db unless forced to increase the gain because there's not enough light. I won't go above +6db on the Z7 as personally find the image too noisy to be acceptable above this level. If there's enough light you should shoot at -6db as this will produce the cleanest image (if this is what you want). Sony simply labelled the lowest gain level -6db instead of 0db for marketing reasons.
|
Quote:
|
Well -6dB is just a much cleaner image (less noise), compared to 0dB, so maybe they are lying...?
|
Quote:
|
Quote:
Look for mosquito like speckles dancing around the image as you increase gain. At 9db or greater you can't miss them, especially in the shadow areas / underexposed areas of the image, and where there are large areas of uniform colour (blue is often a contender). As you decrease gain (electronic amplification of the image to increase brightness), you will see the image become "cleaner". In most cases, it's desirable to shoot at -6db if at all possible, only applying gain as your environs necessitate (eg: in a dim room when your iris is already open and your shutter is as slow as you're prepared to go). I haven't used a Z7 myself, but I'm renting one soon as I need a second camera for a shoot. I'm going to compare it to my XHA1, and if the difference is significant, look to transfer. Noise is a big deal for me - that is, achieving a clean image. It sounds like Sony is fudging things a bit here by calling 0db what should perhaps be +3db or even +6db, but maybe someone has a solid technical explanation for this. I was a little puzzled with my XHA1 having a -3db setting after my previous cameras only went as low as 0. |
All times are GMT -6. The time now is 06:03 PM. |
DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network