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25
votes
6answers
34k views

What are jpeg artifacts and what can be done about them?

I know JPEG is a "lossy" compression algorithm that discards information in order to save space. What is the visual impact of this? I've heard of "JPEG artifacts". What do these look like? Are there ...
18
votes
8answers
22k views

What focal length lens do I need for photographing the moon?

I would like to know whether it is possible to photograph moon without any flaws with a canon EOS 550d.. Also to get an image of the moon as close as the following image, what kind of equipment(lens,...
7
votes
2answers
5k views

How do I set exposure with a manual flash?

I recently got an old Canon AE-1 film camera back in working order. I'd like to use my modern 430EXII Speedlight flash with it, however since there is no TTL metering, I have no idea how much the ...
8
votes
2answers
6k views

If the focal plane is curved, should the outer AF points work correctly or front-focus?

Many (all?) lenses have a (slightly) curved focal plane. In general it's close enough to flat that you don't really notice it, but under certain conditions it may become apparent. As I understand it ...
21
votes
4answers
5k views

Do the same camera settings lead to the same exposure across different sensor sizes?

Let's say I have a micro-4/3rd camera and a full frame camera, both set to 1/60 at f/2.8, taking a picture of the same scene in the same lighting. Will the exposure be the same across both cameras ...
13
votes
5answers
3k views

How can I depict vehicle traffic during daytime in a long exposure without washing out the vehicles?

I would like to take a picture of a street during the day to depict how much traffic and cars there are on the street. Is there anyway to do this with a long exposure photograph? I have a Nikon D90 ...
2
votes
2answers
892 views

Is there a good remote timer compatible with most Nikon and Canon (and Pentax and Sony) cameras?

I wish to experiment with HDR night photography and timelapse video editing. Both require me to take multiple shots are regular intervals for prolonged durations, and I obviously do not wish to sit ...
20
votes
3answers
2k views

What is Chromatic Aberration?

What is Chromatic Aberration? Is it a physical part of the lens, or just an optical illusion?
4
votes
4answers
3k views

How to make camera LCD show true RAW data in JPG preview and histogram?

With Canon 650D (and presumably all the other Canon), I noticed that the picture style and full JPG processing is used to generate a review JPEG which is what the camera actually reads when reviewing ...
52
votes
6answers
21k views

Why are Red, Green, and Blue the primary colors of light?

Colors don't have to be a mixture of red, green, and blue because visible light can be any wavelengths in the 390nm-700nm range. Do primary colors really exist in the real world? Or did we select red, ...
43
votes
5answers
70k views

How do I combine multiple exposures for action shots?

I'd like to create one of those "stacked" action shot images where multiple exposures are combined to show the subject moving across a static background. Here's an example I found on Flickr (by ...
35
votes
3answers
10k views

How can I test a new lens to make sure it is operating correctly?

How can I test a new lens to make sure it is operating correctly? I found two similar questions with answers specific to things such as sharpness and focus, but I want to cover any and all possible ...
28
votes
5answers
4k views

What tips and advice do you have for photographing the Aurora Borealis?

A friend has been kind enough to lend me a DSLR for a few months. It's my first foray into DSLR photography, or indeed any kind of photography beyond simply aiming my Canon IXUS at something and ...
40
votes
8answers
47k views

What should I consider when using DSLRs in cold weather?

What temperatures can consumer-level DSLRs and lenses typically handle? Are there any precautions one should take too minimize potential problems (e.g. condensating water)? What about moving in and ...
36
votes
2answers
7k views

What is “bokeh panorama” (also called the “Brenizer method”)?

Somewhere I don't remember, I heard about the Brenizer method. After reading a few sites, there is no consistent information about what it is exactly, or what the procedures are to apply it, so: ...
36
votes
9answers
30k views

How to nail focus for DSLR astrophotography?

I've been doing a bit of astrophotography and the problem that I almost always have is nailing focus. I'll manually focus on a bright star or the moon (which hopefully isn't an option!) by magnifying ...
32
votes
5answers
5k views

What do Pentax and Sigma DSLRs offer that differs from Canon and Nikon?

We have a question and answers outlining the significant differences between the "big two" DSLR brands. I'm interested in the other DSLR makers, and how the cameras they make compare in terms of ...
29
votes
9answers
2k views

How to choose a lens for my first DSLR?

I am considering buying my first DSLR. How do I know whether I need a 18-200 lens, 17-85, or 18-55? Or something else?
22
votes
4answers
17k views

How do camera body motors compare to in-lens motors for focusing?

What is the difference between using a motor on the camera body and the motor built into lenses? Aside from how both compare in terms of speed, what differences would I notice if I use a body with a ...
18
votes
5answers
14k views

What focal length gives a “normal” field-of-view on APS-C cameras?

I wish to purchase a "standard angle-of-view" prime lens for my Canon Rebel, which has an APS-C sized sensor. Various articles note that the popular "nifty 50mm" lenses are a little too much of a ...
23
votes
6answers
6k views

What is exposure compensation?

What does exposure compensation do? If I take a photo with a given shutter speed, aperature, and ISO, and then take the same shot with +1EV or -1EV, what is actually happening? Is this just a gain ...
15
votes
4answers
17k views

How can a lens with a single focal length focus on more than one plane?

By definition, a prime lens is a fixed lens system with a fixed focal length. Then, simple physics tells us that it should be able to focus only on one plane (at a fixed distance) in front of it. But ...
17
votes
1answer
18k views

Is there a standard tripod mount?

Is there a standard tripod mount? Is it reasonable to assume that a given tripod will attach successfully to a given camera, or will I have to research my options?
4
votes
4answers
3k views

What is “Dragging the Shutter”?

I've heard this term of "dragging the shutter". What does this mean and why would I use it?
3
votes
2answers
2k views

is uv filter a must? [duplicate]

I am using panasonic 25mm 1.7 lens in olympus omd-em10 ii body. Neither of them have a uv coating. Will it hurt lens/processor health if I use it without filter?
2
votes
4answers
2k views

Will the Canon 5D MK II with 100-400 1:4.5-5.6 work properly with Kenko 1.4 converter?

I'm using 5D MKII body and 100-400 f/4.5-5.6 lens. I want to use a 1.4 converter; will the Kenko converter work and autofocus properly?
74
votes
20answers
136k views

How do I set the proper exposure for nighttime moon photos?

All my attempts to get a good shot of the full moon with my DSLR result in an overexposed circle on a black background. I've tried using a tripod, remote shutter release, low ISO, and long exposure, ...
44
votes
10answers
2k views

Should higher ISOs really be preferred (all other things being equal)?

My understanding of the ISO setting on digital cameras is that, unlike film-cameras, changing the ISO does not evoke any physical change in the camera. Rather, it simply tells the camera to multiply ...
38
votes
5answers
7k views

How to get a miniature effect on pictures without special equipment?

I was browsing Behance and came upon these pictures: http://www.behance.net/gallery/The-Little-Things/402879 I was wondering how he got this miniature style effect? I'm guessing a Gaussian Blur on a ...
24
votes
7answers
26k views

How can I avoid star trails without an expensive tracking mount?

I want to take pictures of the Milky Way or a lunar eclipse or earth glow on the moon, but I don't have an equatorial tracking mount, and don't want to spend that much money on one. How can I get ...
39
votes
5answers
8k views

In which situations should I use my circular polarizing filter?

I received a circular polarizing filter as a gift, but I have a hard time determining when I should be using it. I've done river shots with some success, but other than that, it doesn't seem to do ...
35
votes
9answers
45k views

What are the major differences between these camera series by Canon?

Here is a shot of the different series of camras that Canon has to offer: There's several models of Rebel, then there's the 50D, the 5D, and the 1Ds. Broadly, which one is for whom broadly?
48
votes
7answers
7k views

How can I take pictures through a skyscraper, airplane, or train window?

I find that I take a lot of pictures through skyscraper and vehicle windows (those that are impractical or impossible to open). There are all kinds of problems with taking photographs through windows: ...
31
votes
7answers
5k views

Is there a 'rule of thumb' that I can use to estimate depth of field while shooting?

I can use a DoF calculator, or crunch the heavy math by hand if I really want to know exactly what my DoF is going to be... but most of the time knowing exactly is actually overkill, and taking the ...
29
votes
6answers
13k views

What precautions should I take when taking a camera into humid conditions?

My camera's manual warns about sudden changes in temperature, but there are a few cases when I can't see how to avoid this. These include entering a reptile house in a zoo, or a trip to tropical ...
36
votes
6answers
26k views

Why does a bigger sensor lead to a shallower depth of field?

It has been mentioned at a few places that a larger sensor results in images with a shallower depth of field. Example image: APS-C Canon 30D left, FF Canon 5D right, same lens, same composition, ...
38
votes
11answers
12k views

Are equipment reviews from websites like kenrockwell.com and bythom.com reliable?

I know that nothing helps more when buying a lens to test it out yourself, but getting more than one perspective is also helpful. In particular, I run into Kenrockwell.com a lot when trying to get ...
11
votes
4answers
121k views

How can I fix an out-of-focus blurred photo in Photoshop?

How can I fix this picture? Somebody else took this picture and well he wasn't able to do it very well, and it's blurred. I have photoshop
17
votes
2answers
10k views

What effect does a UV filter provide?

I know that I should always use a filter on my lens to protect the camera lens, however, exactly what impact to the picture does using a UV filter have — since that is the one most often used? I seem ...
15
votes
2answers
39k views

What does DPI mean?

What does DPI mean and how does it affect images displayed on screen versus printed?
20
votes
2answers
5k views

Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?

Why does a camera's maximum (allowed) aperture get smaller when you increase its zoom?
20
votes
4answers
4k views

What is GAS and how can I avoid it?

What is this GAS that all the pros talk about? It sounds pretty bad. How do I avoid it? Is there a cure?
23
votes
4answers
3k views

Does it give higher quality to shoot in low-res mode in-camera, or to downsize high-res photos later?

Suppose you want to store your photos at some lower resolution, let's say about ~1 MB large. You own a camera able to make photos at 5 MPix and more. And, you want to have the maximum quality at the ...
12
votes
7answers
18k views

How can I get everything in focus? (Why can't my camera just use all of its focus points at the same time?)

I have a Canon 550D with 70-200 f4 and 50mm prime lenses. Although the camera has built-in 9 focal points, I sometimes face a strange problem. Here's a sample photo: In reference to the above pic, ...
12
votes
5answers
19k views

What's the difference between using a 50mm f/1.8G and a 50mm f/1.8D with a Nikon D80?

Recently, Nikon announced their new 50mm f/1.8G lens, as revamp of the old 50mm f/1.8D. Here's how Gizmodo describes the difference: The main difference between this new "nifty fifty" and the ...
3
votes
1answer
1k views

What should I look for in a wireless flash trigger for a home studio?

I'm an amateur photographer looking for a wireless flash trigger. My gear is Canon 70D with Speedlight 380ex. My question is: what should I look for in a flash trigger? How important is the trigger ...
118
votes
42answers
11k views

What are your easiest photography beginner tips?

Over time, I've found there are a handful of really simple things that anyone can do to take better pictures. What are your favorites? Understand the basics of aperture, shutter speed, and ISO. Take ...
56
votes
22answers
11k views

What's a good strategy for choosing which photos to keep?

Each time I upgrade my camera, the bigger file sizes (especially shooting RAW), my bigger memory cards and happier trigger finger mean that my new photos are consuming way more space. I even have a ...
27
votes
8answers
5k views

How can I make extra money with photography?

I have photos in Getty Images, in Shutterstock, Imagekind and I recently added some to RedBubble, but I'm not having the expected results. Does anyone have some history of success selling photographs ...
57
votes
4answers
75k views

What is moiré? How can we avoid it?

What is the image defect called "moiré"? What causes it, and how can we avoid or reduce it? Is it related to "false color"?

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