Photography Stack Exchange
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1500 questions
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4 answers

What are Color Profiles and where would I find information on using them properly?

I see the term "Color Profile" a lot and I have this vague idea that it helps you adjust color values based on the unique differences of both cameras, displays and printers from some ideal device. Where can I find a good guide to what I need to know…
Larry
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What is the advantage of the huge number of AF points?

If the camera has only 1 central AF point, it is difficult to focus on an off-center subject (without recomposing after autofocus) so having 3 AF points seems really useful. Similarly I understand the advantage of having maybe 5 or event 9 AF…
asalamon74
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What is T-number / T-stop?

Usually, when discussing aperture of a lens, F-stop and F-number are used for quantifying. But some photographers, and especially videographers, also mention T-stop. The concept and numbering used (e.g. T/3.4) seem to be similar to F-stops. What is…
Imre
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5 answers

CSI image resolution enhance: How real is it?

So I watched the following 1 minute long Youtube clip from CSI New York. In the clip, using what seems to be the recording from a standard bank camera, they zoom in at least 100, and see the image of the culprit in the reflection of the eye of the…
user7228
32
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1 answer

What are the differences between E-TTL, i-TTL, and P-TTL?

Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL, and P-TTL. They all use a weak preflash that is metered and used to calculate flash power level required for correct exposure, but I suspect there…
Imre
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5 answers

Is there an EXIF standard for tagging people in photographs?

There are a number of websites that let you tag people in photos, such as Facebook and now flickr, but is there an EXIF standard for tagging who is in a photo, and where they are?
Rowland Shaw
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Why would I want to select an autofocus point?

I'm trying to understand why I would ever want to select an auto focus point other then the center point. I have a Canon XTI Rebel DSLR which has 9 auto-focus points, but I'm also looking into getting a 7D with 19 points. Most of time I have my…
Eric
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What is noise in a digital photograph?

What kinds of effects are present in digital images that are referred to as "noise"? What are the different sources of noise? What causes each type of noise? What are the characteristics of the different types of noise? How do the different types…
Martin
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3 answers

What is a zone plate?

I was looking into alternative methods of photography and I happened upon something called a 'zone plate.' Three questions: What is a zone plate? How does it work? What can I do with it?
Jay Lance Photography
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What license do I use when I don't want stock image companies charging people money for photos?

Let's say I want to release my work into the public domain (at least effectively, as near as is possible), but I don't want companies like Getty and Visual China Group taking my photos, then licensing them to others for money when the end users were…
Mark Fisher
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4 answers

What is focal length and how does it affect my photos?

What is focal-length? Are focal-length and zoom synonymous? How does the focal length of a photo affect it? Are there common uses for different focal lengths, and how can I decide what to use when?
Dan McClain
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What's it called when white objects or white backgrounds become blue in photographs?

Sometimes when I take photos with my smartphone, the white objects or the white backgrounds become blue. Most of the time it happens when the location is a bit shadowed, but sometimes it happens in the same lighting conditions to have one correct…
Fructibus
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7 answers

How should I pack equipment when travelling in countries with high crime rates?

I'm going to travel individually in Sub-Saharan Africa where the crime rate is high. Most of the time I will do landscape photography and only a few shots in urban areas. I've been there already, but without valuable camera gear. I'm not sure if I…
Thomas Rawyler
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What is this physical filter, shaped like a shallow pyramid?

I was going through my parents loft (attic) and came across an old camera bag of my father's filled with bits of old junk and filters. I came across this weird shaped filter which sadly was not boxed like the others. The others were all Cokin and…
Crazy Dino
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Can I show two sides of a card in one photo?

A form I was looking at asked for customers to submit ONE photo of BOTH sides of their ID card. I spoke with the developers of the form and they are changing it. But then it made me wonder is it really that impossible? Are there no creative ways to…
Willemien
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