Serene Life

by garik

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2,500 reputation
1919
bio website
location Norway
age
visits member for 3 years, 5 months
seen 3 hours ago

Hobbyist photographer back in the '70s and '80s. Took my first photo when I was five years old, got an SLR when I was ten. (Film, all manual, handheld light meter, we had a darkroom in the basement.)
Shelved the hobby for a couple of decades. Returned recently, this time with digital equipment.

Jack of many trades (and master of none), but I have a professional background in software development.


Jun
2
comment For digital sensors and in terms of imaging medium, is the minimum CoC equal to the size of 1 sensor pixel or 2? And why?
As for whether it makes sense to treat CoC the same way - I think so, but I'm curious too :)
Jun
2
comment For digital sensors and in terms of imaging medium, is the minimum CoC equal to the size of 1 sensor pixel or 2? And why?
On airy disks and diffraction, see diagrams and explanation at Cambridge in Color: "As a result of the sensor's anti-aliasing filter (and the Rayleigh criterion above), an airy disk can have a diameter of about 2-3 pixels before diffraction limits resolution. However, diffraction will likely have a visual impact prior to reaching this diameter." The basic idea is that a pixel is a solid block of color, there's no resolving taking place before you have at least two pixels with different values.
Jun
2
comment Why do some people say to use 0.007 mm (approximate pixel size) for the CoC on a Canon 5DM2?
@DavyCrockett I think using two pixels makes sense, by analogy with the diffraction limit - the point where you can no longer tell two airy disks apart doesn't happen until the airy disk diameter reaches two pixels. Similarly, a CoC of more than 1 pixel will bleed over and reduce the contrast between a pixel and its neighbour, but actual Confusion, the point where you can't tell two pixels apart, doesn't happen until CoC reaches two pixels. That would be my best guess, anyway.
May
30
comment How could I achieve stock quality sharpness?
Additional point on aperture: Most lenses are sharper when stopped down a bit. I'd try f/5.6 with the 50mm for the maximum sharpness your equipment can give you.
May
30
answered Is it possible to combine compact camera portability with professional SLR quality?
May
22
comment Is vector photography possible?
As you say, any bitmap image can be vectorized. Why should a bitmap vs vector representation matter for the definition of a photo any more than the 'silver nitrate on paper' vs 'RGB pixels' representation? If you mean that the image is generated from a 3D model rather than from the real world, we can already do that pretty well; we call them renderings. If cameras could construct and manipulate 3D models, so we get pictures that are part real-world, part rendering, I expect the discussion will be similar to today's discussions about Photoshop.
May
22
awarded  Yearling
May
15
comment How do you achieve sharp bokeh circles?
Agree that it's (at least partially) a property of the lens, see also a few comparison shots here: rickdenney.com/bokeh_test.htm ("Test scenario 1, wine glass at f/4")
May
12
comment What is the best way to preseve old equipment without fungus and moisture?
Seems to be from $100 and up in Singapore: harveynorman.com.sg/digital-cameras/camera-accessories/… Not all that much compared to the cost of a Leica :)
May
12
comment Use the Nikon D800 to make short YouTube videos & still shots of an owner-build or am I better getting separate video and DSLR cameras at same price?
Why MF: Here's a demo - youtube.com/watch?v=ca_Cd2mX03w And an intro on shooting video with DSLR which covers various options like fluid heads and follow focus.
May
11
comment What is the best way to preseve old equipment without fungus and moisture?
Haven't tried these myself, but I guess you're looking for a dry box - either an airtight enclosure with silica gel, or an electronic dry cabinet like these.
May
10
accepted How to protect camera and lenses against “color bombs”?
May
9
comment How to protect camera and lenses against “color bombs”?
Thanks, makes sense. So something like this, I guess: dicapacusa.com/ProductDetails.asp?ProductCode=WPS10
May
9
asked How to protect camera and lenses against “color bombs”?
May
9
revised Have cropped digital sensors reached their peak design limits?
moved comment to the bottom
May
9
answered Have cropped digital sensors reached their peak design limits?
May
6
comment What's the difference between Canon's silent and non-silent shooting?
@mattdm It flaps the mirror more slowly, so there's less noise when the mirror crashes to a stop. Here's a comparison: youtube.com/watch?v=Rup3T6j_r9s In silent LV mode, it doesn't flap the mirror at all, and uses an electronic shutter in place of the first shutter curtain, so shutter noise is reduced by half - the only noise is the second curtain closing and opening again. (From a 7D review, assuming the 5D version works the same.)
May
4
awarded  Nice Answer
May
4
comment Will there be a need for cameras at all once we have 4k video?
@dpollitt I don't think it would be too hard; I assume a photographer would mostly use the 30fps option when things are happening too quickly for burst mode to keep up. Watch the 30 second clip, find where something interesting happens (the tennis player hits the ball, the bride and groom start kissing, ...), and you may be down to a couple of seconds and 50-60 frames to look at in more detail. A bit of work of course, but hardly infeasible.
May
3
revised Will there be a need for cameras at all once we have 4k video?
minor spelling, phrasing