Lens and Noise?

J

JChang

Active member
Hey fellow DVXUsers.
I remember skimming over a thread talking about how different types of lens (dslr lens) can cause more noise when recording video. i.e. Same Focal Length, F stop, both aps-c lens, but one posses more noise.

Can't seem to find it or anything talking about this anymore. Can anyone confirm this?

If it is true, is there anyway to find a noise ratio or something?
 
Digital "noise" is seen in the darker areas of underexposed imagery. It's pretty much from underexposure. In high ISO you can also see "artifacting" in lighter areas such as skin tones. Camera lenses have nothing to do with "noise" of themselves unless they are transmitting less light at given f stops than other lenses (assuming mechanical diaphragms) thereby causing some underexposure.

One factor few take into consideration may be oversharpening on the monitor. If the monitor's sharpening is too high, contrast and brightness a bit to high even the slightest oversharpening can "enhance" minor artifacting and cause the appearance of noise where there may be little or none.

But camera lenses do not contribute to "noise".
 
Are you asking about sounds? That kind of noise? It didn't sound like you were, but there are a lot of lenses that produce problematic sounds.
 
I believe he's talking about video noise.
Some very sharp lens can get you some deeper blacks than a softer lens that bleeds light to the shadows. A deeper black will get a greater grain.
Also, a slow lens (f:4 and up) will get you less light in, making you more probe to underexposition, and therefore more grain/video noise.
 
Yes, I am talking about video noise. Sorry if that wasn't clear.

Thanks for everyone's input. I tend to notice a finer grain on my 18-250 zoom at f3.5 vs more noticeable grain on my vivitar 17mm @ f3.5
 
Also bear in mind that f-stop calibrations aren't necessarily absolutely similar from one lens to another, or manufacturer to manufacturer. The difference will be minute, but non the less there. To get absolute values you need to look for lenses with T-stops, usually found on the more expensive cine lenses.
 
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