Napioa - Wind Origins

Napioa - Wind Origins
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  • 0 posts edited
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Jun
21
comment How effective is HAMA STAR 61 tripod for shooting with Nikon DSLR?
+1, since that's pretty much exactly my experience with the Hama Star 62. The legs are decent, I think, but the head is so wobbly that it's hard to focus a 300mm on the moon, and a 2 seconds delay isn't nearly enough for the shaking do die down. Still, with care, holding my breath, and a remote release, it beats handholding. Although I'll be looking for a tripod upgrade very soon.
Jun
17
comment What is the meaning of “Blue Hour” and its differences from “Golden Hour?”
There's a nice blue hour/golden hour/moonrise calculator here: jekophoto.eu/tools/twilight-calculator-blue-hour-golden-hour
Jun
12
comment Is it possible to take HDR-photos straight out of camera?
@JørnE.Angeltveit No, you can't. The second exposure adds more light on top of the first exposure, so if either of the exposures blow out the highlights, the multiexposure will be even more blown out since it gets the light from the other exposure on top. A graduated ND is not a general replacement, but it works if your picture has one bright and one dark part and a more-or-less straight line separating them. Or you could use gelatin/plastic ND filters and cut them to the shape you need. IMO multiple shots and post processing is easier.
Jun
11
comment How does autofocus work?
Agree with @mattdm: Phase detection is generally faster, but less accurate than contrast detect. At least according to the lensrentals Canon tests: Contrast detection was just as accurate as careful manual focusing. Phase detect was accurate when it hit, but way off in 10-30% of the cases. A few combinations of the latest lenses (300mm f/2.8) and latest bodies (5D Mk III, but not Mk II) were just as accurate using phase detect. In either case, contrast AF was the gold standard in accuracy.
Jun
11
answered What does “Strobist” in Photography mean?
Jun
8
comment How to protect camera and lenses against “color bombs”?
@ZsbánAmbrus I suppose I could resurrect an old compact camera. I think the "glorified plastic bag" sounds like the best option for when I want to bring my DSLR.
Jun
7
comment What devices transfer photos from one flash media to another?
@Dan At a guess: $55 for a 320GB external disk, $180 for a 320GB Wolverine, $250 for a 320GB netbook. They have a hard time competing on value since just a bit more money will give you a netbook so you can view your pictures too. What's left is a quite expensive special-purpose device with a tiny market.
Jun
7
comment Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?
Another point of reference: The broadcasting industry has some interesting lenses, like this 9.3-930mm f/1.7-4.7, it's f/1.7 all the way up to 300mm. 27kg (60 pounds) and $220,000. Unfortunately, the image circle only covers half of a Micro Four Thirds sensor.
Jun
4
comment Why do lenses have different diameters?
@V.B Almost, but not quite - aperture is the size of the hole you can see through the lens. I guess you are referring to the filter diameter? It will typically be larger than the largest aperture, as you need a tube to hold the lenses and want the filter large enough that it isn't visible in the picture. They are related, but not exactly the same.
Jun
4
comment Why do lenses have different diameters?
@V.B Aperture is the diameter as a ratio of focal length. E.g. 50mm f/2 is a 25mm opening, 200mm f/2 is a 100mm opening.
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.