The higher the apeture, the more of the pic...

[JasonMX]

Is this true:

The higher the apeture, the more of the pic that is in focus

The lower the apeture, the more of the that isn't in focus...

And:

The less light, faster moving object = higher ISO
The more light, lower moving object = lower ISO

What is the average ISO?

[timmyquest]

Is this true:

The higher the apeture, the more of the pic that is in focus

The lower the apeture, the more of the that isn't in focus...


Correct, look up depth of field


And:

The less light, faster moving object = higher ISO
The more light, lower moving object = lower ISO


For the most part, you also have to take into account the lens in use.


What is the average ISO?

there isnt

[robertwgross]

Is this true:

The higher the apeture, the more of the pic that is in focus

The lower the apeture, the more of the that isn't in focus...


The words "higher" and "lower" can get confused.

Just remember that wider aperture is a lower aperture number, and the depth of field goes narrower, and the narrower aperture is a higher aperture number, and the depth of field goes wider (or deeper).

There are several different terms in photography that have reciprocal relationships like that.

---Bob Gross---

[snibbetsj]

What is the average ISO?


there isnt

While that is absolutely true, most (my guess) people use the lowest ISO possible for their shots. The lower the ISO, the less noise, thus the clearest picture, in the photo.

Jeff

[FlipsidE]

Hey Jason, this is Service_Games from the IGN boards. Good to see ya over here. Welcome.

Anyway, Bob is right, aperture can get confusing. Just remember that aperture is measured in 1/x rather than just x. An f-stop of 2 is a wide f-stop where an f-stop of 22 is a narrrow f-stop. 1/2 > 1/22 meaning that an f-stop of 2 has a wider pipe for the light to enter the lens than a f-stop of 1/22. 1/22 is actually quite narrow.

The narrower the pipe for the light to enter the lens, the longer the shutter must stay open. But, at the same time, this allows more of the shot to come into focus before the shutter closes allowing for more "depth of field." The same thing happens in the opposite also. The wider the pipe for light, the shorter the shutter speed, but less of the shot comes into focus.

Also, I would agree that the lower the ISO the better. There is no average, but the lower the ISO, the less noise. So, I would suggest sticking at ISO 100 unless you had to up it because of low light conditions or if you needed to get some "stop the action" kind of shots.

Edit: Let me also suggest this book. I'm about 50 pages into it, and so far, it's been an EXCELLENT beginner guide to photography in general (covering apterture, shutter speed, exposure, camera types, and MUCH more). National Geographic Photography Field Guide: Secrets to Making Great Pictures (http://www.booksamillion.com/ncom/books?id=3003274095600&pid=079225676X)

FlipsidE (SG)

[robertwgross]

Edit: Let me also suggest this book. I'm about 50 pages into it, and so far, it's been an EXCELLENT beginner guide to photography in general (covering apterture, shutter speed, exposure, camera types, and MUCH more). National Geographic Photography Field Guide: Secrets to Making Great Pictures (http://www.booksamillion.com/ncom/books?id=3003274095600&pid=079225676X)


My copy of that book is copyright 2001, and that may be old. A couple of years ago when I got it, I found it to be more inspirational than anything else. My copy has a gray page behind the front cover and in front of the back cover. Those are 18% gray, which is handy.

---Bob Gross---

[FlipsidE]

I believe the one I have is copyright 2003. SO, it's a tad newer. But, I just looked on the opposite page of the front and back cover...and lo and behold both are grey!

FlipsidE

[Sam North]

DoF:

http://photography-on-the.net/forum/viewtopic.php?p=335483&highlight=#335483

[JasonMX]

Hey Service_Games, didn't even know you posted here. Thanks to you and everyone for the information. I am ordering a beginners book and taking a none credit class at the college I graduated from in digital photography. That should help me get a handle on these things.

My father, who unfortunely lives 2 hours away, was professional photographer for about 10 years and is also a wealth of knowledge. However, he does not like these "digital" things because he uses different developement techniques to add stlye to his stuff.

[Pekka]

What is the average ISO?


there isnt

While that is absolutely true, most (my guess) people use the lowest ISO possible for their shots. The lower the ISO, the less noise, thus the clearest picture, in the photo.

Jeff

Choosing ISO should not be based on noise levels but on need to get a certain exposure (aperture and shutter speed, flash range/ambient). If noise gets absolutely too great then it may limit your choices but otherwise (e.g. 50-1600 in Mark II) you should choose it merely by other needs than noise reduction.

[robertwgross]

Choosing ISO should not be based on noise levels but on need to get a certain exposure (aperture and shutter speed, flash range/ambient). If noise gets absolutely too great then it may limit your choices but otherwise (e.g. 50-1600 in Mark II) you should choose it merely by other needs than noise reduction.

Just think how it would change our techniques if we could choose virtually unlimited ISO without any color noise.

---Bob Gross---

[chris.bailey]

Is this true:

The higher the apeture, the more of the pic that is in focus

The lower the apeture, the more of the that isn't in focus...

And:

The less light, faster moving object = higher ISO
The more light, lower moving object = lower ISO

What is the average ISO?

I think its a shame to have stuck with the term ISO. Back in the old days when we kept bulk roll of Ilford FP4 in the fridge it made some sense but with the low noise levels of modern sensors I would have though a different terminology might have been better.

[Jon]

I think its a shame to have stuck with the term ISO. Back in the old days when we kept bulk roll of Ilford FP4 in the fridge it made some sense but with the low noise levels of modern sensors I would have though a different terminology might have been better.

ISO is the International Organization for Standardizations (acronym is French); ISO 100 is a standard specific sensitivity and response level to light. This applies whether you're using film, CCD, or CMOS. Each category will respond slightly differentlyacrossthe intensity curve, but then so will films, or sensors, within each category. Of course, it's also being used to provide a degree of commonality between film and digital equipment. Can you imagine trying to work with flash Guide Numbers if you had to remember whether they were film ISO or CMOS, in addition to meters or feet?

[timmyquest]

Choosing ISO should not be based on noise levels but on need to get a certain exposure (aperture and shutter speed, flash range/ambient). If noise gets absolutely too great then it may limit your choices but otherwise (e.g. 50-1600 in Mark II) you should choose it merely by other needs than noise reduction.

Just think how it would change our techniques if we could choose virtually unlimited ISO without any color noise.

---Bob Gross---

It's only a matter of time if you ask me.

Serious Digital photography is only a few years old and look at what the new canon SLR's are doing.

I dont think we're all that long from seeing

A.) ISO 6400 on the cameras
B.) ISO 3200 being more then a freak feature...i think it'll be a pretty common setting.

And i'm only thinking of a year or two in the future...just imagine what it'll be like in 10 years

[JasonMX]

I think I am again mixed up and now about ISO. I was under the impression the ISO in digital camera was logical equivilent to the speed of regular film. Is that true?

So just like a regular camera you use higher ISO settings for fast moving things, but there is a potential for digital noise the higher youd go.

Is shutter speed the same thing as ISO?

[timmyquest]

I think I am again mixed up and now about ISO. I was under the impression the ISO in digital camera was logical equivilent to the speed of regular film. Is that true?

So just like a regular camera you use higher ISO settings for fast moving things, but there is a potential for digital noise the higher youd go.

Is shutter speed the same thing as ISO?

The only difference between a film SLR and a digtial SLR is where the picture goes.

ISO=the same thing
SHutter speed=the same thing
Apperature=the same thing

If you have ISO 400 film in your camera and your at F/2.8 and your camera meters for 1/250...dandy

Your digital camera if set to ISO 400 and your at f/2.8 and your looking at the same subject, you wills till be at 1/250

[Jon]

I think I am again mixed up and now about ISO. I was under the impression the ISO in digital camera was logical equivilent to the speed of regular film. Is that true?

So just like a regular camera you use higher ISO settings for fast moving things, but there is a potential for digital noise the higher youd go.

Is shutter speed the same thing as ISO?

They're two different things altogether, part of the "exposure triangle" of shutter speed, aperture, and ISO.
ISO is a characteristic of the film or the sensor (post-processing setting). With either film or digital, you're subject to noise (grain in film) as you go to higher speeds.
Shutter speed is separate, and is a mechanical characteristic of the camera. It works the same in digital and film.
Aperture is a setting on the lens, determining how large an opening the light is allowed through.

[robertwgross]

JasonMX, you might want to sign up for a basic photography class at some local community college or adult education center. The basics of exposure are generally taught very early in the course.

---Bob Gross---

[PhotosGuy]

Read this:
Hyperfocal
http://photography-on-the.net/forum/showthread.php?t=47865