Signal to noise ratios in photography
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- Опубліковано 5 лют 2020
- Today I am going to talk about the signal to noise ratio in photography, once you understand this and how noise is created by your camera, you can start being able to create better images and you’ll have a better understanding of your camera.
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ISO invariance: • What is ISO Invariance...
4 ways to reduce long exposure noise: • 4 ways to get rid of l...
ISO explained: • ISO (Photography) Expl...
Exposure bracketing: • An Introduction to Exp...
Here is the link to my website page where this is all written down so you can take more time to ingest it all: www.boxheadmike.com/signal-to-...
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Mike
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Super clean explanation man, and great sound too! Makes it really pleasing to listen to!
Thanks very much! I have a lot of fun making these videos!
Thanks for watching 😁👍
Definitely deserves more views. I’m trying to explain signal to noise ratio to a friend and this did it perfectly!
Thanks so much James! It was a big one to research and I learned a lot making it as well!!
Thanks for watching 😁👍
Mike Smith Of course! I thought I knew decent amount on the subject going into this video but I still leaned a lot!
This was sooooo long, I fell to sleep half way and woke up with a chock when advertisements came on. Thanks a lot for the information in the first half part though!
Haha!! Yep, lots of info in there...maybe I should put more adverts through it to keep waking you up!! 😆
This was something I've never really had a good grasp on. Amazing explanation. Love all the activity and conversations in the Facebook group you've got going. :)
Thanks so much Paco! I'm glad I could help.
It's developing nicely over on Facebook isn't it. Really enjoying how it's growing and everyone is getting involved. 😁
Thanks for watching 👍
such a wonderful lecture... thx. i'm now a fan of you
Thanks so much Jamil! I have lots of others on my channel and I release two videos a week so make sure to check back for lots more tutorials!
Thanks for watching. 😁👍
Wow, that was a ton of information, Mike. Thank you for breaking that down for us and explaining why we see the different noise levels in situations where we tried to prevent that very thing. Exposure first is how I try to shoot, making myself push my ISO a little more. Stay tuned next week when Mike explains exactly how NASA designs propulsion systems to follow exact trajectories that interact with different gravitational orbits. I can't wait.
Haha!! You must be psychic...how did you know that was next weeks subject!? 😆
Thanks so much dude, this was a beast to make but I really enjoyed doing it...and I learned a lot as well!
😁👍
FYI, Sony is dual iso isoless, so when you pull up the exposure from 100 +4 stops - it is actually better starting at ISO640 and boosting 1 stop or so. ISO 100 and 640 on Sony is the native isoless settings. 640 has more DR and less noise than 500. I use 640 when shooting nightsky, etc. If I underexpose at 640 I will retain details in the hightlights which would be lost at ISO 1250, this while sticking at the best dual ISO setting to increase the dark part of the image. ISO640 have a different voltage than ISO100 I think. Some dude explained this very well, I think his name is Kasson. Check his blog.
Thanks for the info Aleksander, I'll be sure to check out his blog...I'll have to do some research in it as I've been wanting to do an update to my iso video for a while and it would be great to get all the info down in one place. 👍
Really really useful sir ! thank u ! u were really helpful and ur way explaining all these stuff even better!
Thanks so much! 😁👍
oh man! i have been doing it soo wrong!! thinking that is better to bump the exposure in lightroom that to bring up the iso on camera! because i came from canon!.... thanks again for sharing your knowledge mike!! big like to this video!
Great to hear it has helped Gustavo! There are so many different ways with different cameras and different settings...I learned a lot in researching for this video...so it's a win win for us all!!
Thanks for watching commenting and liking, much appreciated! 😁👍
Great video Mike, most certainly be watching again, will try harder to get it right in camera from now on. 🤘
Thanks so much!
It was a beast to make but really interesting, I learned a few things when researching for this one... And I am guilty of fixing it in post sometimes as well. 😆
Thanks for watching dude. 👍
Thanks for the video mike
No worries, it's a big one today but lots of info in there to soak up! 😁👍
This is new info for me. Thanks...
No worries dude, there's a lot to take in... 😁👍
Thank you so much Sir. You explained it so well and with simple language. When I was graduating, we had photography as subject, I couldn't understand Signal to Noise Ratio's concept. Wish I had watched this video earlier. But this video is really helpful, will recommend this to my friends. I will surely check out your Facebook page and will sign up.
Thanks very much! Great to hear it has helped.
Thanks for watching. 😁👍
Really interesting topic & well covered Mike, Thanks . . . also to "Joe" who obviously had input as you mentioned as well !
A couple of the points made were "Light Bulb" moments for me. Cheers.
That's great to hear! There's a tonne of info in this one and it was a beast to make but I learned a lot along the way as well.
Joe's post is well worth reading as well...so if you're not yet part of the group go over and join. 😁👍
Definitely going to be watching this video twice, Mike - a lot of dense but highly interesting information. ( ha, is this "27 minute Thursday"?) The best thing that I ever did was learn how to shoot manual with confidence so all of this makes a lot of sense!
Haha!! 27 minute Thursday!! 😆
It was really interesting making this one and I learned a lot from the research as well. 😁
Shooting manual seems so daunting, but with a bit of practice it all starts to make sense doesn't it.
Thanks for watching and commenting, much appreciated. 👍
Wow, so much information. Very interesting subject. I feel this is something that can make good photos into great photos.
Haha!! Have you been binge watching!? 😆
Most definitely. Understanding this principle really helps. 😁👍
@@mikesphotography I have to make time to watch your videos. They always have so much information packed into a short amount of time. Thank you!
Thanks so much Lance! Appreciate having you as a part of the community. 😁👍
2BorNot2B- Long but thorough explanation, Mike. How does in-cam long exposure noise reduction compare w/noise reduction in LR? Is one preferable to the other? Some say always keep Sony’s in-cam noise reduction off.
for night shot, for example astrophotography, the in-body noise reduction is not so good...the "star-eater" issue can be "visible"
Thanks Paul, I'm going to a test video for the long exposure noise reduction to see how it does...i did one a while back to show what it does but not to test it against lightroom... but for me it's mostly to do with the time it takes to process. It seems to do a dark frame with each shot...so the camera is in lock down, processing, for the same time as your exposure to then get rid of the hot pixels.
Francesco, I always thought that as well...better to have the data with a few hot pixels that you can remove afferwards than an altered raw file that may get rid of some stars as well...👍
Bravò! =)
Thanks!! I learned a lot from making this one!! 😁👍
Thanks Mike. I don't think this has been brought up, but for someone who is often exposed to noise, in his photography, like night photo, astrophotography, would you recommend to use a full frame sensor camera ? Or would a full frame sensor be significantly (I insist on this word) reducing noise ? Thanks !
Hi Gilles,
There is a slight improvement with a full frame camera, but with sigma making lenses like the 16mm 1.4 for crop sensor cameras, the differences are getting smaller...I want to do a direct comparison as soon as possible between the 16mm f1.4 on a crop sensor camera and a 24mm on a full frame in astrophotography...it would be interesting to see how different they would be in the exact same setting and the exact same framing.
If you had the 16mm 1.4 and stacked a series of images, I think the differences would be negligible.
Thanks for watching. 👍
This is very interesting and educational! I have a Sony A7R iv - it has high ISO and low light noise correction ability in camera. What do you think of these camera builtin noise reducers?
Thanks so much!
I've done a video on the long exposure noise reduction but not the high iso reduction.
I'm hoping to borrow the a7riv soon and take it out under the night sky to test these features out so keep an eye out for that video.
How are you getting on with the a7riv and those large files!?
Mike Smith looking forward to it!
Awesome stuff. Now I am a little confused about you're examples. The first and second sample images were shot with the same settings ISO 200 f8 and 1/200s ...so how did you underexpose the second image keeping the same settings as the first properly exposed one?
I meant ISO 100^^
Do you mean the examples at 4:08?
@@mikesphotography I was looking at the one at 15:30 which is the underexposed shot. I was wondering how you underexposed it by keeping the same settings as the original well exposed photo...but I just realized that it was taken much later in the day and that's why it was significantly darker at iso 100. the third photo taken at Iso 640 turned out much better than iso 100! This taught me a lot! thank you.
1 dislike?Damned Eos RP shoterZ x°D
Haha!! There's always one!!! 😆
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Thanks 😁👍👌
You mention "high iso noise", but that is not a good term. The noise in question is not due to high ISO, but it is due to low amount of light hitting the sensor, which gives a low signal/noise ratio (the topic of the video). For isoless (iso-invariant) sensors the signal/noise ratio is independent of the ISO setting. For traditional cameras (e.g., Canon), the noise is reduced (not increased) when cranking up ISO on camera, for a given amount of light hitting the sensor (which you also correctly said in the video) (while not blowing out highlights) because analog amplification amplifies the signal before it becomes blended with more downstream noise sources in the system. Another comment I have is about "Exposure". There is a slider in Lightroom named "Exposure". It should have been "Gain" or "Amplification". To me, the exposure means only aperture setting and exposure time, which define to what extent the sensor is exposed to light when the image is captured. ISO is applied later as analog or digital amplification. A question: In the images you made with lens cap on, did you use the same aperture and exposure time for both examples (low ISO setting and high ISO setting)? If you, however, used smaller aperture opening or shorter exposure time for the "high ISO noise" image, then what you termed high ISO noise was not really that, it was reduced light noise, (reduced signal/noise ratio noise). For a given amount of light, turning up ISO either makes no change to noise or reduces noise.
Thanks for your feedback Viktor. I understand ISO invariant sensors and have done a video on it in the past.
If my use of "high ISO noise" is not a good term, that then also puts sony in the same boat...in the menu of a lot of their cameras there is a setting called "high iso noise reduction"...🤔
Ever considered being a professional voice couch?
Haha!! Not really...maybe a voice over guy...but I make so many mistakes that I have to cut out that the editor would probably get annoyed quite quickly!! 😆
Thanks for watching. 😁👍