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| Tweet Topic Started: Feb 17 2009, 05:25 PM (932 Views) | |
| Ming | Feb 17 2009, 05:25 PM Post #1 |
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90609866
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Hi Everyone , i have a Question here . Most of us are avoiding higher ISO due to the noise . But why is it that our Alpha got ISO up to 6400 ? Normally when i shoot slower than 1/15 or 1/30 , i will have to use ISO up to 800 or higher . Of course all these will have to depend on the surrounding lightings . Q : Under what situation will we use ISO higher than 1000 & all the way up to 3200 or 6400 ? Bright daylight , ISO can be used up to 3200 or higher with lesser noise visible ? After evening or very low lighting , have to use higher ISO then PP away the noise ... ? |
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| yannh | Feb 17 2009, 06:46 PM Post #2 |
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Alpha Sniper Member
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As for me, I will try to use higher ISO to achieve faster speed which overcome motion blur. I agree that noisier pictures can be PP, but blur picture is just blur. I always find ISO not high enough for indoor shooting. Not sure about whether higher ISO gives you more dynamic range. |
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| Birder | Feb 17 2009, 07:36 PM Post #3 |
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Alpha Master Jedi Mita Memori-san ’¹‚Ì’j clkoh
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shutter speed, f stop, EV, iso are inter-dependent at any lighting situation. Adjust one, one of the other got adjusted. If you can have shutter speed and f stop sufficient enough to do your shot, use the lowest iso you can. Using focal 1/focal length formula as guide, you control your shutter speed and iso. if shutter speed too slow, adjust f-stop until you cannot adjust, then only you adjust iso. 1/60s (say 60mm) should be around the speed to get "good" shot for most people. I know there are some super steady people can shoot 1/8s an below handheld. Tele lens eg. 200mm and above.. you need at least 1/200s or faster. Sometimes you have a purpose, to shoot at certain shutter speed and f-stop, for reason like bokeh, freezing the shot, etc, the only way to use the combination you want, you have to adjust the iso. Sometimes you want the grainy effect of high iso for BW? For night shoot without flash or tripod, the only way to get decent shot is probably to increase iso... For example, my recent shots of Jessica Lu & Fruition, they are shot wide open or almost, iso increase to 1600 or 2000. Edited by Birder, Feb 17 2009, 07:37 PM.
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| tankm | Feb 17 2009, 09:07 PM Post #4 |
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Always Newbie
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For desperate situation where it's better to get some "usable" shot rather than nothing.
When the shutter speed is too slow, either use brighter lens (provided the DOF is still acceptable) or higher ISO to increase the shutter speed.
Noise is less apparent in correctly exposed area. In bright daylight where there are shadow areas you will still see noise in those. Hence the "DK" technique of doing expose to right and then pull down the exposure during PP.
Use tripod if possible.
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| red dwarf | Feb 17 2009, 09:44 PM Post #5 |
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Martian
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I guess for starry night photography. hahahha!!! Cause when I shoot sky at night my lowest ISO setting is 400 with my prime lens 55mm@F2 and @ 1min exposure, still not enough light data collected. Then have to shoot more frame. If I let it at 30mins exposure without tracking, it become star trail already. For my scope, the highest ISO I will go is at 1600 still consider low-exposure. To get rid of the noise, I have to capture a few Dark frame which means cosolidate the noise level in black frame within a same ISO and exposure, then from there will do post-process to subtract the noise level. |
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| Ming | Feb 18 2009, 12:39 AM Post #6 |
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90609866
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So i assumed that most of the time we will never ever use the ISO as high as over 3200 or 6400 ba ? Unless only wanted it for special effects ... Because i tried shooting Birds from my house opposite , quite far ... Evening about late 730pm & i was in A Mode at f5.6 with the Minolta 300mm f4 and the shuttle speed by the Alpha was about 1/30 & i find it quite a mess trying to shoot that Bird ... So i switched to S Mode & start shooting at 1/200 but is always dark at f4 ISO100 . Only until i pump the ISO to 800 & above then i can have a faster click but the photo is noisy liao ... For i remember if using 300mm , the shuttle have to be somewhere at 1/300 ... or ... ? Am i wrong ... ? |
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| s.khai | Feb 18 2009, 01:54 AM Post #7 |
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my inspiration, my journey...
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shuttle? haha..hmm maybe try shooting birds earlier ming? as for me i still do try to kip my ISO at 100 or 200 for my pics..i only adjust my aperture and shutter accordingly.. |
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| Birder | Feb 18 2009, 12:35 PM Post #8 |
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Alpha Master Jedi Mita Memori-san ’¹‚Ì’j clkoh
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from personal experience, general guideline.. A700 can go up to iso800 for decent shot provided not underexposed. Anything above you need quite some works on the post process. A100 or equivalent, iso400 max to go... Maybe somebody can advise further .. on other models.. |
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| Trigger Happy | Feb 18 2009, 02:05 PM Post #9 |
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Alpha Jedi Member
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Ming, yes, general rule is your shutter speed shd match or exceed your focal length. that reduces handshake or subject/ motion blur (to varying degrees). i know of some ppl who can hand hold up to 2sec and get a sharp image of a stationary subject. btw, 7:30pm is not an ideal time to shoot birds lor.. haha.. 7:30am would work better so far i've not been desperate enough to go above 800 for iso. |
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| red dwarf | Feb 18 2009, 02:09 PM Post #10 |
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Martian
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Unless you hunting for Owl. |
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Evening about late 730pm & i was in A Mode at f5.6 with the Minolta 300mm f4 and the shuttle speed by the Alpha was about 1/30 & i find it quite a mess trying to shoot that Bird ...
So i switched to S Mode & start shooting at 1/200 but is always dark at f4 ISO100 . Only until i pump the ISO to 800 & above then i can have a faster click but the photo is noisy liao ...

8:44 AM Jul 11