ISO VS Gain at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Alpha and NEX Camera Systems > Sony NEX-EA50 (all variants)

Sony NEX-EA50 (all variants)
Including NEX-EA50UH / EA50EH / EA50H / EA50UK / EA50EK / EA50K


Reply
 
Thread Tools Search this Thread
Old August 14th, 2013, 09:37 PM   #1
Trustee
 
Join Date: Sep 2007
Location: Newark, Delaware
Posts: 1,029
ISO VS Gain

please excuse my million questions on my new camera but what is the relationship between ISO and gain? It looks like I can go to 3200 ISO and have plenty of light but what is that doing to the image? is it like 36 db gain?
Randy Johnson is offline   Reply With Quote
Old August 15th, 2013, 03:29 AM   #2
Regular Crew
 
Join Date: Apr 2013
Location: Duisburg
Posts: 93
Re: ISO VS Gain

Base ISO is 200und = 0db

Add 6db = double ISO value:
6db = 400ISO
12db = 800ISO
18db = 1600ISO
24db = 3200ISO

I try to avoid values higher than 1600ISO/18db.
But the amount of digital grain also depends on your picture profile.
The higher the shadows are lifted, the more grain you'll see.
Erik Wittbusch is offline   Reply With Quote
Old August 15th, 2013, 10:52 AM   #3
Trustee
 
Join Date: Sep 2007
Location: Newark, Delaware
Posts: 1,029
Re: ISO VS Gain

So either I add gain or ISO it really doesnt matter? ISO is equal to gain for the most part?
Randy Johnson is offline   Reply With Quote
Old August 15th, 2013, 02:21 PM   #4
Regular Crew
 
Join Date: Apr 2013
Location: Duisburg
Posts: 93
Re: ISO VS Gain

It's equal.

Just different readings.

Choose ISO if your familiar with and let the db readings alone...
Erik Wittbusch is offline   Reply With Quote
Old August 15th, 2013, 05:05 PM   #5
Trustee
 
Join Date: Sep 2007
Location: Newark, Delaware
Posts: 1,029
Re: ISO VS Gain

Wow so it would seem that even with a fast lens this camera really sucks light. I am shooting in a very well flousencent bulb lit room and if I have it on 160 iso I dont have near enough light even if I get a faster lens it wouldnt be enough. On "The bright side:)" I shot last night at 1600 iso (I think) and looked at the footage and I couldnt really see much grain. So maybe there will be a lot of gained up shooting in my future.
Randy Johnson is offline   Reply With Quote
Old August 15th, 2013, 07:53 PM   #6
Inner Circle
 
Join Date: Jul 2009
Location: Perth, Western Australia
Posts: 8,222
Re: ISO VS Gain

Base ISO is actually 160 on this camera not 200 so 6db will be 320ISO and 12db 640ISO etc etc.

I limit my cam at 21db for weddings which is around 3200 but the gain at 24db is still OK to use. Randy? try an F2.8 lens or faster in low light. BIG difference ... My Tokina 11-16 wide zoom at constant F2.8 is magic!!!

Chris
Chris Harding is offline   Reply With Quote
Old August 15th, 2013, 08:56 PM   #7
Trustee
 
Join Date: Sep 2007
Location: Newark, Delaware
Posts: 1,029
Re: ISO VS Gain

Where can I get it? B&H doesnt seem to have it. Do I need a adapter?
Randy Johnson is offline   Reply With Quote
Old August 15th, 2013, 08:59 PM   #8
Trustee
 
Join Date: Sep 2007
Location: Newark, Delaware
Posts: 1,029
Re: ISO VS Gain

What about this?
Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens2569A004 B&H
Randy Johnson is offline   Reply With Quote
Old August 15th, 2013, 11:32 PM   #9
Regular Crew
 
Join Date: Mar 2013
Location: Paradise, CA
Posts: 158
Re: ISO VS Gain

Quote:
Originally Posted by Randy Johnson View Post
Where can I get it? B&H doesnt seem to have it. Do I need a adapter?

where can u find what? did you tried amazon?
Chris Quevedo is offline   Reply With Quote
Old August 16th, 2013, 12:32 AM   #10
Inner Circle
 
Join Date: Jul 2009
Location: Perth, Western Australia
Posts: 8,222
Re: ISO VS Gain

I'm using Novoflex adapters on both cameras (eBay Germany) They are expensive but shucks they are really like the original part and well worth the extra!!

I have Nikon D90's too so mine are for all my Nikon lenses.

Chris
Chris Harding is offline   Reply With Quote
Old August 16th, 2013, 01:16 AM   #11
Regular Crew
 
Join Date: Mar 2013
Location: Paradise, CA
Posts: 158
Re: ISO VS Gain

Quote:
Originally Posted by Randy Johnson View Post
oh i see we're talkin about faster lenses. try the sigma 18-35mm f1.8, that will definitely be fast. just needs an adapter ;-)
Chris Quevedo is offline   Reply With Quote
Old August 16th, 2013, 03:32 AM   #12
Inner Circle
 
Join Date: Jun 2007
Location: Belgium
Posts: 9,064
Re: ISO VS Gain

Quote:
Originally Posted by Chris Harding View Post
the gain at 24db is still OK to use.
That would be 5000 iso I think, no? But have to say it looks bad in terms of noise at that iso, if you are desperate to get a shot then I"d say yes and use neatvideo, but otherwise better stay clear from it.
Noa Put is offline   Reply With Quote
Old August 16th, 2013, 03:34 AM   #13
Inner Circle
 
Join Date: Jun 2007
Location: Belgium
Posts: 9,064
Re: ISO VS Gain

Quote:
Originally Posted by Randy Johnson View Post
So either I add gain or ISO it really doesnt matter? ISO is equal to gain for the most part?
It doesn't matter, also not what value in iso equals a gain value, you can use whatever you like and judge your footage afterwards to see what the max iso or gain is you can use before it turns ugly.
Noa Put is offline   Reply With Quote
Old August 16th, 2013, 07:02 AM   #14
Inner Circle
 
Join Date: Jul 2009
Location: Perth, Western Australia
Posts: 8,222
Re: ISO VS Gain

Hi Noa

Yes, I agree..that's why I limit gain to 21db tops!! (or 3200 ISO) 24db is noisy even if you are using a light fill so both my cams limit at 21db so the dark areas are noise free ... 24 db (5000 ISO) will give you an image if you are desperate but yes, it will need cleaning up considerably. What a lot of people don't realise it that in auto iris, the camera looks at the complete image area so if you have a small subject close up and a huge dark background then it will lift gain or iso EVEN if you are using a fill light on the subject. On my Panny's Randy, I actually used to clamp gain right down to 12db and use a fill light so the big sensor on the 50 does a lot better!

Chris
Chris Harding is offline   Reply With Quote
Old October 7th, 2014, 02:23 AM   #15
Regular Crew
 
Join Date: Jun 2011
Location: Germany
Posts: 163
Re: ISO VS Gain

my camera iso starting from 160 after reset now starting from 200 to 6400 why?


solved...starting from 160 with no profile
Serggio Lamas is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony Alpha and NEX Camera Systems > Sony NEX-EA50 (all variants)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:25 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network