I Dare You!

by peter_budo

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1,026 reputation
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bio website blueraja.com/blog
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visits member for 3 years, 11 months
seen Mar 23 at 16:40

1d
awarded  Notable Question
Mar
16
comment How can I reduce noise at ISO 100 in photos taken in the twilight?
"you may actually get better results by raising the ISO" - that's only true if you're planning on increasing the exposure in post, not decreasing it as you suggest here. See my question about that very post.
Mar
16
comment How can I add a border to a JPEG photo without affecting quality?
Keep in mind that this is likely to significantly increase the size of the image...
Feb
12
comment What am I photographing INSIDE my camera?
+1 this is the correct answer. EM noise is all around us. The sensor+circuitry will necessarily pick up all sorts of noise, from both inside and outside the camera. Heck, the laws of physics require that any electric-based sensor generates noise which it itself will pick up. That's just how electricity works.
Feb
10
awarded  Necromancer
Dec
29
revised Are DSLRs a dying breed, making now the time to switch to a mirrorless camera system?
deleted 783 characters in body
Nov
12
comment Does a “body-only” DSLR need a lens added before use?
Rather than some random picture from a pinhole camera, how about a picture of what you'll actually see if you try to take a picture without a lens?
Oct
24
awarded  Good Answer
Oct
12
awarded  Nice Answer
Jul
2
awarded  Curious
Jun
24
awarded  Good Question
Jun
24
comment Should higher ISOs really be preferred (all other things being equal)?
@BBking: Yep, that's what I finally got out of all this as well. I had just read from Matt's post the highly shocking statement "Actually, high ISO is good!" while missing the hidden subtext "..good compared to increasing the brightness in post, but still not as good as increasing the aperture, shutter-speed, or lighting!"
Apr
22
awarded  Yearling
Jan
19
awarded  Popular Question
Oct
16
awarded  Popular Question
Jul
22
comment Why is F/8-F/11 called a “Who cares aperture”?
"if you look at lens tests of any really good lenses and the peak sharpness tends to be at f/4" - The amount of diffraction primarily depends on the physical size of the aperture, but the physical size of "f/4" depends on the focal length. f/4 at 15mm will actually be physically smaller than f/5.6 at 100mm, and thus should exhibit more diffraction, despite being a smaller f-number. So I think the aperture at which "diffraction has a measurable effect with a high megapixel DSLR" must be dependent on both the f-number and the focal length.
Jul
15
comment Why are lenses always round in shape?
@anaximander: True, it doesn't mean QED isn't related to the engineering aspects of lens design, but the fact is that it's not; lens-design considerations are entirely encapsulated by the field of optics. This answer is like saying that in order to be a computer programmer, you need to understand quantum mechanics (which describes how transistors work). It's just a hand-wavy attempt to say "it's too difficult to understand," which really means "I don't know."
Jul
15
comment Why are lenses always round in shape?
...lol? You're claiming that to understand why lenses are round, you need QED (a theory developed in the late 1940's, long after the theory of optics had fully matured)?
Jul
12
revised Can you remove scratches from a lens with peanut butter?
deleted 18 characters in body
Jul
12
comment Can you remove scratches from a lens with peanut butter?
@MichaelClark: en.wikipedia.org/wiki/Toothpaste#Abrasives "Abrasives constitute at least 50% of a typical toothpaste." You might be right about the peanut butter though, I'll edit that out.