Auto ISO (Page 11): :sm24: :sm24: means little to me using a Z9.

Sinewsworn Loc: Port Orchard, WA

DaveJ wrote:

I use manual with auto ISO almost 100% of the time. With modern cameras, ISO is my least important setting. I use EC to adjust for backlit or other tricky light. For me, the wrong shutter or aperture can ruin a photo. I can work with some fairly high ISO if shutter and aperture is where I want or need it. YMMV.

means little to me using a Z9.

jcboy3

DirtFarmer wrote:

I think here you're just reducing the signal from the sensor. The resulting image will look dark because you're seeing the noise in the shadows.

Noise is in the shadows because the image is underexposed. But low ISO will result in more noise if in the non-invariant ISO region.

Sidwalkastronomy Loc: New Jersey Shore

BebuLamar wrote:

When I shoot film, ISO 160 is as high as I will go. I hate the grain. So yeah for a lot of pictures I simply not take the shot.

Haven't shot film on 20 years. 7000 photos on a $25.00 card and its reusable. Of course if I shoot Raw, which I do now, RAW+JPEG IT GOES TO AROUND 1500

Sidwalkastronomy Loc: New Jersey Shore

jcboy3 wrote:

Noise is primarily determined by the exposure sett... (show quote)

I would disagree about the noise. I think and fellow huggers can confirm or reject it but noise is from the ISO and sensor not f stop and shutter speed

epd1947

BebuLamar wrote:

I use A mode with Auto ISO about 50 percent of the time when I think the meter is correct. Doing so the camera would obtain aperture, shutter speed and ISO settings very close to what I would use if I were to do it manually.
When I don't think the meter is correct (correct isn't really a correct term, I mean when I decide that I need more or less exposure than the meter would give) I switch to M mode and Auto ISO off.

In such situation - why not just tweak the exposure up or down using exposure comp?

keywest305 Loc: Baltimore Md.

I shoot manual on my Z9 and also did on my D850. I always shoot auto ISO. I set my aperture and shutter speed and never worry if a cloud comes and blocks the sun or shooting in the shade. Always works fabulous.

jcboy3

Sidwalkastronomy wrote:

I would disagree about the noise. I think and fellow huggers can confirm or reject it but noise is from the ISO and sensor not f stop and shutter speed

Why do you think that?

Aperture and shutter speed control how much light hits the sensor. More light, less noise. ISO controls the amplification of the sensor output. It does not, for the most part, affect noise levels. When the image brightness is increased by ISO, the noise is increased as well.

Sidwalkastronomy Loc: New Jersey Shore

keywest305 wrote:

I shoot manual on my Z9 and also did on my D850. I always shoot auto ISO. I set my aperture and shutter speed and never worry if a cloud comes and blocks the sun or shooting in the shade. Always works fabulous.

The newer sensors have much better noise control at HIGHER
ISO SO what is your upper limit set at?

BebuLamar

epd1947 wrote:

In such situation - why not just tweak the exposure up or down using exposure comp?

I hate the EC. I never used it. Even my first camera back in 1977 had it but I hate it and never used it.

Sidwalkastronomy Loc: New Jersey Shore

jcboy3 wrote:

Why do you think that?

Aperture and shutter speed control how much light hits the sensor. More light, less noise. ISO controls the amplification of the sensor output. It does not, for the most part, affect noise levels. When the image brightness is increased by ISO, the noise is increased as well.

I did say I'll defer to other huggers on that but it was my understanding that turn up sensitivity on sensor ypu get more noise. Like turning up stereo speaker too loud get distortion, not a great example.
Fellow hoggers HELP

jcboy3

Sidwalkastronomy wrote:

The newer sensors have much better noise control at HIGHER
ISO SO what is your upper limit set at?

I usually set my upper limit to the upper limit of the natural ISO (rather than extended). Varies by camera, but usually around 6400. Since most of my cameras are ISO invariant (or close to it...I don't shoot canon), it really doesn't matter within a few stops.

rehess Loc: South Bend, Indiana, USA

Sidwalkastronomy wrote:

I did say I'll defer to other huggers on that but it was my understanding that turn up sensitivity on sensor ypu get more noise. Like turning up stereo speaker too loud get distortion, not a great example.
Fellow hoggers HELP

My experience has been that noise is reduced if light is increased. If light is low and the picture is under-exposed, boosting exposure in post increases the noise.

larryepage Loc: North Texas area

rehess wrote:

My experience has been that noise is reduced if light is increased. If light is low and the picture is under-exposed, boosting exposure in post increases the noise.

Noise comes from a number of places, but the biggest is from adding something that isn't there...as in an underexposed image. One of my cameras is a D500, which has a bad reputation for noise at higher ISOs. I've never found that to be a big problem unless the image is underexposed.

jcboy3

Sidwalkastronomy wrote:

I did say I'll defer to other huggers on that but it was my understanding that turn up sensitivity on sensor ypu get more noise. Like turning up stereo speaker too loud get distortion, not a great example.
Fellow hoggers HELP

If you're going to defer, then do so. But you continue with these inappropirate analogies. It's not distortion. What you get from cranking up the ISO is blown highlights. And an amplification of the existing noise because your image was underexposed.

SuperflyTNT Loc: Manassas VA

jcboy3 wrote:

Not according to any of my camera manuals. Shooting mode is a mode. Auto ISO is just another setting.

But you can quote me your camera manual defining Auto ISO as a mode.

Too bad you can’t grasp a deeper understanding than what is printed on paper.