topic Re: Rebel Sl1 lots of noise at 100 ISO?? in EOS DSLR & Mirrorless Cameras

Rebel Sl1 lots of noise at 100 ISO??

Bricheez — Sun, 27 Mar 2016 02:44:58 GMT

I recently got my rebel for Christmas and have been using it in a basic 101 class. My teacher and I have noticed that in my photos with low ISO, there is as much noise as with and ISO 1600. The lens and everything has been cleaned, I've done bracketing shots and all are the same, I'm not sure if it's an internal issue or not. Anyone having similar issue or can offer advice

Re: Rebel Sl1 lots of noise at 100 ISO??

jrhoffman75 — Sun, 27 Mar 2016 03:03:47 GMT

Can you post a sample at each ISO.

Re: Rebel Sl1 lots of noise at 100 ISO??

TTMartin — Sun, 27 Mar 2016 11:53:08 GMT

@jrhoffman75 wrote:
Can you post a sample at each ISO.

I agree we would need to see some samples.

Somethings to think about:

Are you sure you aren't confusing out of focus areas with noise?

Is this straight out of the camera or after post processing?

Exessive sharpening in post processing can create noise.

Re: Rebel Sl1 lots of noise at 100 ISO??

ebiggs1 — Sun, 27 Mar 2016 14:05:51 GMT

This is mandatory for anyone here to analyse your problem.

"Can you post a sample at each ISO."

"I recently got my rebel for Christmas ..." "The lens and everything has been cleaned, ..."

So each was new on Christmas? Your 'teacher' and you thought each was already dirty or contaminated? My first thought is you need a different teacher. But samples are what is required.

Re: Rebel Sl1 lots of noise at 100 ISO??

ScottyP — Sun, 27 Mar 2016 17:46:45 GMT

A crop sensor should not have any noise worth mentioning at ISO 100. If you are pushing underexposed shots that makes noise but you say you bracketed the shots and they look the same at + and - exposures. Unless something is dreadfully wrong with the camera it is hard to believe that what you are seeing is noise.

Are you maybe shooting in some extreme "effects" setting, with the camera pushing the saturation or something in making the JPG's? Or heavy amounts of lighting optimizer applied? Maybe try resetting all your settings to default in the menu tab that allows you to do that. Maybe in the process of exploring all the camera settings somehow something odd got dialed in.

Re: Rebel Sl1 lots of noise at 100 ISO??

Bricheez — Thu, 07 Apr 2016 21:57:31 GMT

Here are some examples.

The first photo is ISO 100 and the second is ISO 1600.

These were shot with my 18-55mm zoom stock lens that came with the camera kit. At first I thought the issue was just this lens but it has happened with my brand new 50mm as well.

Re: Rebel Sl1 lots of noise at 100 ISO??

jrhoffman75 — Thu, 07 Apr 2016 22:02:56 GMT

File size is too small to see anything meaningful. Can you upload full size images?

Re: Rebel Sl1 lots of noise at 100 ISO??

Bricheez — Thu, 07 Apr 2016 22:25:11 GMT

took camera in today to get it looked at an there is nothing wrong with the sensor or the lens but they think it could potentially be the chip. Please let me know what you think

Re: Rebel Sl1 lots of noise at 100 ISO??

jrhoffman75 — Thu, 07 Apr 2016 22:55:40 GMT

There is definitely something in the sky. Are you sure someone didn't try to clean the sensor with liquid cleaner? It looks like there is something on the AA filter. Its not digital noise.

I would send the camera to an official canon service center for cleaning and check.

Re: Rebel Sl1 lots of noise at 100 ISO??

ebiggs1 — Fri, 08 Apr 2016 12:57:02 GMT

The res is so low I can't say but I really don't think anything is wrong. I d/l the two images and really don't see what you are.

But this will set your mind to rest ....

"I would send the camera to an official canon service center for cleaning and check."

They can tell you for sure. You may just be at all the lens you have can do.

Re: Rebel Sl1 lots of noise at 100 ISO??

jrhoffman75 — Fri, 08 Apr 2016 13:10:21 GMT

There is a dark/light pattern in sky. I've seen similar when folks wet cleaned sensor and did a poor job.

Re: Rebel Sl1 lots of noise at 100 ISO??

ebiggs1 — Fri, 08 Apr 2016 13:25:44 GMT

The res is too low and pixelated for me to tell for sure. You might be right. It may be all the lens is capable of. Sending it to Canon is the sure way to tell.

Re: Rebel Sl1 lots of noise at 100 ISO??

Peter — Fri, 08 Apr 2016 14:04:49 GMT

Take a new sample of the same sky and shoot in raw. Upload the file wherever you want. For example at filedropper.com.

I ask you for a raw file because it is hard to tell if the thingy at the sky is jpg compression or something because of sRGB.

For me it seems "normal" and has nothing to do with wet cleaning or broken things in the camera.

Re: Rebel Sl1 lots of noise at 100 ISO??

ebiggs1 — Fri, 08 Apr 2016 14:29:07 GMT

"For me it seems "normal" and has nothing to do with wet cleaning or broken things in the camera."

I tend to agree.

Re: Rebel Sl1 lots of noise at 100 ISO??

Peter — Fri, 08 Apr 2016 14:48:00 GMT

It is called posterization.

It is caused by the 8-bit JPG not having enough data to give you a smooth gradient when large blocks of color slowly change. You’ll often see it in the blue sky in landscapes, or as in this case, with large areas of color in the background.

Shoot in raw, edit in 16 bit tiff and in Photoshop, save for web. You will still be able to see, but much less of it.

Re: Rebel Sl1 lots of noise at 100 ISO??

ebiggs1 — Fri, 08 Apr 2016 15:17:01 GMT