How do you fight big ISO? - DPChallenge Forums

Canon EF 24-70mm f/2.8L USM

05/31/2006 07:55:12 AM · #1

Neat Image? Ok. I used ISO 400 taking some pics and ran through NI twice. Noise was still more than apparent. I've seen some guys using iso up to 3200??!!! How do you handle noise there?
Help appreciated

doctornick

Apple iPhone 13 Pro

05/31/2006 08:06:23 AM · #2

Neatimage, NoiseNinja are solutions to remove noise from high ISO photos, but they are not perfect. Properly exposing your shots help a lot. But the bottom line is high ISO shots on small sensor point and shoots will be noisier than high ISO shots on bigger sensor DSLR's.

Leok

Pentax K10D

Sigma 28-70mm f/2.8 EX DG for Pentax

05/31/2006 08:10:19 AM · #3

It depends on a lot of things. If the image was under exposed (too dark) this exaggerates noise quite a bit. NI can remove most noise in my experience, but the final image may be a bit soft. Settings - I generally go to the device noise profile tab ,draw a box in a fairly plain area of the image and then hit auto profile. The the next tab allows for tweaking - draw a box again, hit the preview button. I generally zoom in 100% at this point.

I know you can also use device profiles but haven't tried it yet.

Hope this helps - if not maybe crop a bit out of your image and post it here for us to try NI on.

05/31/2006 08:11:30 AM · #4

Originally posted by doctornick:

But the bottom line is high ISO shots on small sensor point and shoots will be noisier than high ISO shots on bigger sensor DSLR's.

That explains a lot. Thanks Doc.

Sony FE 3.5-5.6/28-70 mm OSS

05/31/2006 08:13:16 AM · #5

Originally posted by Leok:

maybe crop a bit out of your image and post it here for us to try NI on.

Thanks, but it's in a challenge right now so I don't want to expose it.
Thanks a lot.

JunieMoon

Sony Alpha a7 II

05/31/2006 09:09:38 AM · #6

It has been my experience with this camera that after iso 200, the noise gets almost unbearble. That is one of the things said about this camera when it came out. It is really bad for low light. Nothing can be done, neat image or otherwise. Some shots come out okay with iso 400, but even at iso 64, if it is low light there will still be noise. I am curious about the alpha slr which will be on the market by July I think. The noise may still be a problem. Sony has to get its act together when it comes to that issue. Anyway, I may buy the camera anyway as an entry into the dslr style. Not that Canon is all that bad (obviously, there are enough owners here) but I kind of have always gone for the underdog when it comes to purchasing.

darnok

Nikon D850

Nikon AF-S Nikkor 16-35 f/4 ED VR

05/31/2006 09:16:54 AM · #7

I also have a 5MP Sony P&S, and while ISO 200 is still acceptable, ISO 400 is practically unusedable. Not only do you get lots of noise, you also get a noiticeable loss of sharpness.

steveh552

Canon EOS-700D Rebel T5i

Canon EF-S 18-55mm f/3.5-5.6 IS STM

05/31/2006 09:52:07 AM · #8

I use Noiseware pro, its a PS plug in and it works almost perfect. Iv shot at ISO 1600 with every little noise, and what noise was there, it took care of. Mind you, I am using a DSLR, when I had my Fuji S5000, noise was horriable at ISO 400 and most programs did not take care of it. I guess it depends on how much noise is there.

ralph

Nikon Z9

05/31/2006 10:05:20 AM · #9

convert to B&W & call it art ;)

fotomann_forever

05/31/2006 10:06:59 AM · #10

Originally posted by ralphnev:

convert to B&W & call it art ;)

:-)

Nikolai1024

Nikon D300

Nikon AF Zoom-Nikkor 24-85mm f2.8-4.0D

05/31/2006 10:40:02 AM · #11

I fight it with my big and heavy tripod.

eschelar

Canon EOS-7D

Canon EF-S 17-55mm f/2.8 IS USM

05/31/2006 10:56:02 AM · #12

I also have a 5MP 1/2.5" sensor camera. It does not have any benefit to switching to ISO 400 and I NEVER use it. Ever.

Even in areas with shadow at ISO 50, there is a slight amount of noise that is simply not there with bigger cameras... Why?

Because bigger pixels store more real information. Smaller pixels store less real information. Noise is digital 'errors' caused by various reasons.

When the ratio of 'signal' from real information to 'noise' from digital error becomes too low, the camera cannot correct adequately.

In fact, the noise is still generally present throughout the picture, but when compared with say 180 levels of real information, the amount of information from noise is very slight. Take a photograph with a lot of sky and play with the selective color tool with a very low 'fuzzy' value and you will see that even in bright subjects, the noise is still there... You don't see it because the ratio is low....

If you want to visualize, it's like a teaspoon of dirt in a glass of water compared to a teaspoon of dirt in a bucket of water. You probably wouldn't drink the first one, but you might not even notice the second.

Shooting with a DSLR is like a teaspoon of dirt in a bathtub full of water. It pretty much disappears and you probably wouldn't think twice about taking a drink (except for those who would feel weird drinking water from a bathtub.. :).

P&S cameras will always be affected by this more because individual pixels are several times smaller than on DSLR's.

I wouldn't worry too much about the Sony Alpha mount DSLR's. They will be 1.5x crops, likely using the same sensors as the current D50 and my guess would be a higher end model with the same sensor as the D200 (both are Sony sensors)... maybe an upgrade to put Sony in a better position than Nikon... People seem pretty satisfied with those sensors right now. Expect to see banding issues the same as in the D200 if Sony uses a new sensor.

If you are experiencing loss of sharpness at high ISO's with a P&S, this is because the camera manufacturers know about how bad the noise can get, so they put special programs in the camera to reduce the noise called "in-camera noise reduction".

It is the cause of the softening, even though at ISO 400, no Noise Reduction algorithm is enough.