Wide angle lens = more noise?

I noticed more when shooting with my Tamron 17-35 on the 6D. At ISO800 the noise is very visible compared to same ISO using 85mm or the 70-200 which is still smooth.

I consulted Dr.Google but it told me my lens is probably crap and has cancer.

Might be pixel cancer, not lens cancer...

Seriously though, do you have any examples? It shouldn't make a difference

I'll try to upload samples but it looks like an image seen from ISO3200 or higher.

If anything is bad I'm assuming it's the sensor?

Aki78 wrote in post #16874507
I'll try to upload samples but it looks like an image seen from ISO3200 or higher.

If anything is bad I'm assuming it's the sensor?

If it's okay for other lenses then I doubt there's anything wrong with the sensor... samples will help

A lens is going to have ZERO affect on noise, other than it widest aperture perhaps forcing you to shoot at higher ISO to get a proper exposure. But, that is a global factor that applies to any lens, not just a wide angle.

In a wide angle, where the same subject tends to be smaller, and therefore less pixels, any noise will tend to be more apparent than in a photo taken with a longer lens where the subjects tend to be magnified and made up of more pixels and appear to be less noisy. You wouldnt be the first to notice this. But try using the wide lens with same framing as the longer lens and I think you'll find they are both the same.

I'll upload some untouched crops later. The noise reduction has always been turned off also.

I was puzzled when even Dr. Google wouldn't give me a straight answer.

Try shooting with both lenses at ISO800, f/5.6 and an equal shutter speed, noise levels should be the same then. Keep in mind that just because two lenses might have the same f/stop the t/stop could still be different, thus causing a different exposure. Darker exposures exhibit more noise, that's likely all you're seeing.

Also as a wide angel is likely to include more sky in the view this can skew the camera's metering system and you can end up with underexposed subjects as a result. Boosting the exposure in post then pushes up the visible noise in the image. As Everydaygetaway aid try shooting in manual with the same settings. I would suggest metering as normal using the longer lens (or the long end of the zoom) and then shooting the wide angle image. As long as you are pointing the camera at the same scene the exposure should remain constant, so don't re-meter for the wider shot.

Although our cameras meter using the light reflected from the scene it is the light that is falling ON the scene that determines the correct exposure.

Alan

Are you shooting raw and looking at the raw file through LR or DPP or ACR? Are you possibly confusing "noise" for "jpg compression"? A wide angle blue sky when viewing a JPG version could show graduated compression steps that might be confused for noise.

EverydayGetaway wrote in post #16875059
Try shooting with both lenses at ISO800, f/5.6 and an equal shutter speed, noise levels should be the same then. Keep in mind that just because two lenses might have the same f/stop the t/stop could still be different, thus causing a different exposure. Darker exposures exhibit more noise, that's likely all you're seeing.

This! The different T-stop and equivalent F-stop seems like a plausible explanation.

Also, keep in mind that even if you do manage to balance an exposure with a longer shutter speed, a longer shutter speed is associated with more noise. Examples of noise due to a long shutter speed can be found when attempting astrophotography, even with low ISO's.

I tried searching up information on the T-stop of the Tamron 17-35mm f2.8-4 but couldn't find anything. Anyways, do perform some tests at equivalent settings. I am interested to see whether or not this is truly an issue of different T-stops despite both lens being set to the same F-stop.

VCY wrote in post #16875343
This! The different T-stop and equivalent F-stop seems like a plausible explanation.

Also, keep in mind that even if you do manage to balance an exposure with a longer shutter speed, a longer shutter speed is associated with more noise. Examples of noise due to a long shutter speed can be found when attempting astrophotography, even with low ISO's.

I tried searching up information on the T-stop of the Tamron 17-35mm f2.8-4 but couldn't find anything. Anyways, do perform some tests at equivalent settings. I am interested to see whether or not this is truly an issue of different T-stops despite both lens being set to the same F-stop.

I know that for LONG exposures but is there really a noise difference between 1/200 and 1/250?

+1 gonzogolf. Take shots of a uniform surface, such as this: http://www.pbase.com …l/image/9517436​3/original. That way, the results will not be confounded with the different amount of detail. then check the histogram after each shot. if you have to adjust the exposure with lens to make it comparable, do that too, to remove a difference in exposure.

This should have nothing to do with the sensor.

Hang on, here, gang, please explain what a "t-stop"/"t/stop" is!

tonylong wrote in post #16875728
Hang on, here, gang, please explain what a "t-stop"/"t/stop" is!

http://en.wikipedia.or​g/wiki/F-number