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ISO
Nov 30, 2011 19:24:15 #
Is ISO sensitivity adjustment in a camera really that nessessary or is it just a selling gimick? People seem to think the higher you can go, the better the camera, without realizing the highest ISO setting renders the photo totaly useless. The higher you go the worse the photo looks, I mean, why bother? I once took 2 pictures of a stream running down the side of a road. The first one I took in "Auto " mode, the second, I adjusted the exposure compensation to -0.7. When I printed 8 1/2- 11, the differnce was like night and day. The one taken in "Auto" mode looked decent but I can hardly make out the rocks laying below the water, the second one I adjusted the "exposure comp." I could make out every rock laying below the water clear as a bell. Would I have been able to get the same effect with an ISO adjustment? BTW, with the camera I was using, the apeture and shutter speed cannot be manualy adjusted
Nov 30, 2011 19:33:43 #
Would you be able to post the two photos so that we could get a better understanding of what you're talking about?
Nov 30, 2011 19:56:31 #
I will as soon as I can dig up the 8x10's, I no longer have them on my card
Nov 30, 2011 19:57:17 #
It's no gimmick for sure. When digital first got going, you couldn't crank up the iso (allowing more sensitivity to light) without introducing all kinds of noise into the photo. I have two cameras, Canon 40D and a 5D Mark II. I generally wouldn't turn my iso up on my 40D past 400 for fear of noise, and it's quite the opposite with the 5D. Being able to increase iso without introducing noise is big plus when photographing in low light when a decent shutter speed is needed. Yep, you get what you pay for. I'll admit, if I turn my iso to 12,800, my picture will be grainy, but I can take it in the dark with a decent shutter speed. And the technology just keeps getting better.
cjkorb wrote:
Is ISO sensitivity adjustment in a camera really t... (show quote)
Nov 30, 2011 20:13:28 #
I understand an ISO adjustment makes the sensor more or less sensitive to light but wouldn't you get just about the same effect with exposure compensation? If I have go above ISO 400, I just don't use it. I use exposure comp. instead.
Nov 30, 2011 20:33:14 #
Sure, if you are willing to sacrifice shutter speed or aperture. Correct exposure is a triangle made up of iso, aperture and shutter. Change one it affects the other two. Exposure comp will only get you so far, and if you never take photos (or expect to) in anything less than relatively bright light, you are good to go.
cjkorb wrote:
I understand an ISO adjustment makes the sensor more or less sensitive to light but wouldn't you get just about the same effect with exposure compensation? If I have go above ISO 400, I just don't use it. I use exposure comp. instead.
Nov 30, 2011 21:53:04 #
cjkorb wrote:
The first one I took in "Auto " mode, the second, I adjusted the exposure compensation to -0.7.
"adjusting exposure compensation to -0.7" does not tell us much about your exposure. Were you still on "Auto", a mode where the camera makes ALL of the decisions: ISO, focus, aperture, & shutterspeed? What were you contributing?
cjkorb wrote:
BTW, with the camera I was using, the apeture and shutter speed cannot be manualy adjusted
I seriously doubt that you were using a DSLR.
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Dec 1, 2011 07:51:43 #
photocat
Loc: Atlanta, Ga
There are many cameras that don't handle high ISO well, however, there are some that are outstanding.
Depending on the intent and the lighting conditions being able to use a high ISO without noise is a serious advantage.
Using exposure compensation certainly has it uses, but there is a point when that is going to be able to give you the effect your looking to achieve.
There are a variety of reason your two images revealed different details, many not related to ISO.
It would help to see the images and the metadata.
Depending on the intent and the lighting conditions being able to use a high ISO without noise is a serious advantage.
Using exposure compensation certainly has it uses, but there is a point when that is going to be able to give you the effect your looking to achieve.
There are a variety of reason your two images revealed different details, many not related to ISO.
It would help to see the images and the metadata.
Dec 1, 2011 15:27:53 #
My camera isn't a DSLR, it's a Nikon point & shoot, not many manual features, mostly automatic. When I bring up the ISO, the camera chooses the shutter speed and aperture. In my opinion, ISO setting in a mostly automatic camera is almost useless. My ISO sensitivity goes from ISO 80 to 6400 and if I go above ISO 400, the pics have too much noise. In high end point&shoot's and DSLR's ISO can come in handy if you can use most of the settings. If not too many of you people lost intrest by now...I'll send the pics soon
Dec 1, 2011 17:08:33 #
photocat
Loc: Atlanta, Ga
point and shoot cameras don't have large sensors and the signal to noise ratio is huge, so yes there are limitations.
In fact every camera on the market has limitations, regardless of cost. We as photographers learn what they are and then choose the right tool for the results needed.
I am still interested in seeing the difference in what your seeing with your below water shots.
In fact every camera on the market has limitations, regardless of cost. We as photographers learn what they are and then choose the right tool for the results needed.
I am still interested in seeing the difference in what your seeing with your below water shots.
Dec 1, 2011 18:08:29 #
If your camera has too much noise at ISO 400 you need to upgrade. Get yourself an entry level DSLR and you'll see a massive difference. Nikon D3100 is what I would recommend.
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Dec 1, 2011 18:45:05 #
Yes, I am getting getting a D3100 next month, that's if Santa, (My Wife) reads my list and checking it twice
Dec 2, 2011 13:29:18 #
Dec 2, 2011 13:29:24 #
Here are the two pictures.
Shot in automatic mode
Shot in exposure compensation -0.7
Dec 2, 2011 13:50:49 #
ISO like megapixels is more noise than substance. If you go about an ISO of 800, the result is noise. I would prefer to see an ISO of 25, but it is less glamorous for sales. As for MP's, 12 is more than you will ever need.
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