Excess Noise with Sigma EF 50-500 for canon: I just purchased a Sigma telephoto after I returned a 500mm Canon lens. Im shooting with a 30 mp Canon EOS R. Note that neither lens was an...

Roe Cole

I just purchased a Sigma telephoto after I returned a 500mm Canon lens. Im shooting with a 30 mp Canon EOS R. Note that neither lens was an RF. Both were EF using an RF to EF adapter.

Both lenses have produced photos with a great excess of graining is them. Graining so bad I couldn’t use photos from either lens. To me the glass looks clear and have been cleaned.

I also have other EF lenses that go to 300mm and these lens produces very clear photos without issue.

After changing from the Canon to Sigma lens and getting the same results, I’m curious of it may be the impact of the EF-RF adapter or perhaps is there some other issue.

Any thoughts as to why the grain is so bad in these lenses?

rmalarz Loc: Tempe, Arizona

Roe, I'll bet you are going to get a lot of "post some photos" requests.
--Bob

Roe Cole wrote:

I just purchased a Sigma telephoto after I returne... (show quote)

Leitz Loc: Solms

Roe Cole wrote:

I just purchased a Sigma telephoto after I returne... (show quote)

The lens will not produce grain (noise). Check your exposure and ISO.
Edit: If you are going to post a photo, please respect Admin - do not post it here in Main Photography Discussion!

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Roe Cole wrote:

I just purchased a Sigma telephoto after I returne... (show quote)

If you want cogent and comprehensive responses, post some samples. Otherwise, enjoy the garbage that is sure to come. For what it's worth, there is nothing in an optical system that will cause digital noise or grain in a digital camera. It is entirely in the camera and how you set it.

Feel free to ignore the guy who says that you should be posting in another section. He is mistaken.

You can read the rules here:

https://www.uglyhedgehog.com/t-1-1.html

There is nothing forbidding you to post an image in this or any other section. But if you are looking for general critique or just showing off (something that is natural for people involved in creating visual artistry) - your post may be moved to other sections - Photo Gallery, Photo Analysis, Post-Processing Digital Images, Photo Critique, Advice from the Pros, and a variety of other special interest groups.

selmslie Loc: Fernandina Beach, FL, USA

Leitz wrote:

The lens will not produce grain (noise). Check your exposure and ISO.
Edit: If you are going to post a photo, please respect Admin - do not post it here in Main Photography Discussion!

There is no reason not to post an image in the thread. It’s done all of the time.

Admin doesn’t care either.

It’s just that if you attach an image in the opening post of a thread there is a bot that might automatically move it to the Photo Gallery.

The same thing happens if you include a link in the opening post. It will get moved to Links an Resources.

PHRubin Loc: Nashville TN USA

Generally speaking, the higher the focal length, the smaller the aperture. Smaller apertures (along with fast shutter speeds) need a higher ISO. High ISO is what causes noise. Check your settings. If you can get the ISO down and still get good exposure, that should help.

bleirer

Roe Cole wrote:

I just purchased a Sigma telephoto after I returne... (show quote)

Usually noise is associated with underexposure in terms of shutter speed and aperture, not caused by the lens to my knowledge. You could test it in nice light with correct exposure at relatively low iso and see if it is still noisy.

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

PHRubin wrote:

Generally speaking, the higher the focal length, the smaller the aperture. Smaller apertures (along with fast shutter speeds) need a higher ISO. High ISO is what causes noise. Check your settings. If you can get the ISO down and still get good exposure, that should help.

You've got a point, sorta. He said he had the same problem with both lenses - a Canon 50mm and a newer Sigma. Canon's 500mm EF lenses are either F4.5 or F4. I believe Sigma also has a new F4 and an older F4.5. Most of the time, due to depth of field concerns, shooting apertures tend to be a little smaller than wide open in any case. This is why the OP needs to provide more info or post some samples.

Leitz Loc: Solms

selmslie wrote:

There is no reason not to post an image in the thread. It’s done all of the time.

Right. And more's the pity.

selmslie Loc: Fernandina Beach, FL, USA

Leitz wrote:

Right. And more's the pity.

I guess we we should be grateful that you have never posted one of your images, anywhere.

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Gene51 wrote:

You've got a point, sorta. He said he had the same problem with both lenses - a Canon 500mm and a newer Sigma. Canon's 500mm EF lenses are either F4.5 or F4. I believe Sigma also has a new F4 and an older F4.5. Most of the time, due to depth of field concerns, shooting apertures tend to be a little smaller than wide open in any case. This is why the OP needs to provide more info or post some samples.

My apologies! - he has a Sigma 50-500, not one of the 500mm primes.

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

selmslie wrote:

I guess we we should be grateful that you have never posted one of your images, anywhere.

You have to wonder what it says about someone who has to impress you with a handle that describes a camera - you know who they are

rcarol

Gene51 wrote:

You've got a point, sorta. He said he had the same problem with both lenses - a Canon 50mm and a newer Sigma. Canon's 500mm EF lenses are either F4.5 or F4. I believe Sigma also has a new F4 and an older F4.5. Most of the time, due to depth of field concerns, shooting apertures tend to be a little smaller than wide open in any case. This is why the OP needs to provide more info or post some samples.

I don't see where he references a Canon 50mm lens. Am I missing something?

Canisdirus

Nevermind..he was shooting through a screen door.

rcarol

Canisdirus wrote:

Nevermind..he was shooting through a screen door.

Are you serious?