Alley in Pisa, Italy

by Lars Kotthoff

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2
votes
1answer
242 views

Why do some people say to use 0.007 mm (approximate pixel size) for the CoC on a Canon 5DM2?

The 5DM2 pixel size is approximate 0.00645mm in size and so some people talk about using 0.007mm as the CoC. I think canon said once they use 0.035mm for DOF charts, full frame normal is 0.033mm, ...
7
votes
1answer
558 views

Comparing 1:1 zoom on a 27“ screen at 2560 x 1440 vs 22” screen at 1680 x 1050

When using Adobe Photoshop or Lightroom for example, and zooming the photo at 1:1 ratio, when you work on a 22" screen at 1680 x 1050, there is an great inside zoom. On such a screen the pixel are ...
5
votes
1answer
314 views

How can a newer camera increase ISO while decreasing pixel size?

I am a bit confused as I am considering to upgrade my canon 350D to 600D. The pixel size has reduced from 6.4 microns to 4.3 microns, however, top ISO has increased from 1600 to 6400. How did that ...
6
votes
2answers
1k views

Olympus OM-D developing hot/dead pixels within two weeks of purchase

I recently bought an Olympus OM-D on holiday and took around 2000 photographs in the 2 week period on holiday. On day 12 it developed some white/pink pixels on the sensor. I've emailed Olympus ...
3
votes
2answers
434 views

How to calculate object size dependent on distance?

I shot some images for use in a blog post. With the closeups, I ran into the problem of too low depth of field. Because I only need them for the web, I think that the easiest way to solve it would be ...
1
vote
1answer
174 views

What is the “Resolution” and how it's related to “Printing”

What do we mean by "Image Resolution" anyway and how it's related to printing on paper? Is resolution related to displaying the image on computer screens too? What is the meaning of "High ...
10
votes
2answers
3k views

What is “pixel density”?

Apparently megapixels aren't a good way to measure the camera quality, so some people are referring to a relative measuring system called "pixel density". What specifically is this? What information ...
3
votes
3answers
1k views

What to look for on a DSLR's LCD?

I think the main features of a reflex's LCD are: size resolution (pixels/dots) vari-angle or not So how important is each one of them? Which one is the most important? What number of pixels is ...
2
votes
1answer
125 views

Why changing image format changes the area shown on the LCD screen?

Recording pixels option when set to Large 14M 4320x3240, in Canon PowerShot SX 210 IS, puts black bars on the vertical sides of the screen. The shot is NOT thus fully seen in its LCD screen. Why is ...
8
votes
6answers
21k views

Is it possible to increase the pixel density of an image?

I have taken a picture whose resolution is less. I can resize the image easily (i.e I can scale to higher resolution) but the image quality goes for a toss, which is true because the image might not ...
12
votes
4answers
3k views

Why are effective pixels greater than the actual resolution?

This page compares Canon EOS 550D and Canon EOS 500D cameras and mentions 18.7 million effective pixels for 550D. However the best resolution possible using this camera is 5184 * 3456 = ...
6
votes
4answers
1k views

Upscale iPhone taken photograph

I have taken a photo with my iPhone which i would love to use a my website background using jQuery to stretch it dynamically. However its obviously a fairly low resolution. Is there anything i can do ...
4
votes
2answers
1k views

How should one deal with 'hot' pixels on Canon T1i, either in-camera on in Aperture?

I recently took quite a few pictures at my brothers wedding, and when going through them in Aperture 3, I noticed a pretty apparent red pixel towards the bottom left of my images. I didn't notice this ...
14
votes
6answers
3k views

What megapixel value is equivalent to which ISO film?

Is there some kind of equivalency table or formula that expresses what kind of pixels you need in a digital camera to have roughly the same quality as a particular ISO graded film? What other ...