Low light performance more about the sensor or lens?

8 years 11 months ago #439839 by Crammer
I always thought that the larger the sensor, the better the low light performance would be.  I was just reading another photographers blog where he suggested that it's all about the lens, NOT the sensor size that determines optimum low light performance.  Although it makes sense, so does my thought about sensor size.  Which is correct?  


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8 years 11 months ago #439841 by Screamin Scott
Both will have an effect. In film days, it was about faster (and grainier results)  film coupled with faster lenses. Now , with digital, it's about  more sensitive sensors with   faster lenses. Either a fast lens or a more sensitive sensor  will get you better low light images, both are equally important...

Scott Ditzel Photography

www.flickr.com/photos/screaminscott/

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8 years 11 months ago #439851 by tganiats
Yes...both can have an effect.   However, just because a sensor is bigger doesn't mean it will have better low light performance...it is the pixel size that matters...adding more small pixels won't help low-light much...it is that larger sensors can have larger pixels.  That said, a pixel of a given size manufactured in 2010 will have less low-light capabilities than one manufactured in 2015.

The lens is also complicated.  One easy part of the lens is the maximum aperture.  A faster lens (small f/stop number) will do better in low light (if that aperture is used).  However, something I learned recently (and I'd love others to confirm) is that even at a fixed aperture, some lenses will transmit more light than others.    Is that right?


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8 years 11 months ago - 8 years 11 months ago #439854 by Screamin Scott
Actually yes it is. Light coming into  a lens is measured on cameras by the "F" stop. transmitted light is measured as a "T" stop value..... Here's a link to  a Wiki on them... It gets pretty technical though.


en.wikipedia.org/wiki/F-number

Scott Ditzel Photography

www.flickr.com/photos/screaminscott/

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8 years 11 months ago #439856 by Crammer
Oh cool, helpful.  Happy I posted this today.  I'm going to check out that link.  I better get a cup a coffee I'm guessing for this one?  


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8 years 11 months ago #439862 by Joves

Screamin Scott wrote: Both will have an effect. In film days, it was about faster (and grainier results)  film coupled with faster lenses. Now , with digital, it's about  more sensitive sensors with   faster lenses. Either a fast lens or a more sensitive sensor  will get you better low light images, both are equally important...

:agree:
Yeah the grain is what would kill you unless you were into hypering film, or buying it. And then not all films would cook really well for doing that. So hence fast glass, is and always will be king in the area of giving you more light to work with. But the beauty of the digital age is that you can shoot with much faster shutter speeds in lower light even with the lens stopped down to a greater extent. So the lens is not the primary performer for low light for some camera models. Though having fast glass does give you an advantage speed wise for the shutter end.
The larger the sensor does not mean that it is better at low light, it only means it has more surface are to gather what it sees, and more room for photo sites depending on size. The larger the photo site the more photos it can collect from any available light. But if you use too large of a photo site the resolution drops, but you can shoot in essentially the dark. Now they are going back to pixel packing, and losing some of it, but not as much as they have gained. It is a win for us in that we are now able to do thing we only dreamed we could do in the old days. I fell lucky to have seen it all change.


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8 years 11 months ago #439977 by Crammer
Thanks for the additional insight Joves


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8 years 11 months ago #440065 by ThatNikonGuy
Actually I would have nothing further to add, very good thread


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8 years 11 months ago #440089 by Stealthy Ninja
Honest answer is "it depends".
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