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by Lars Kotthoff

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BlueRaja - Danny Pflughoeft

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942 reputation
516
bio website blueraja.com/blog
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visits member for 3 years, 3 months
seen Jul 23 at 15:53

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.
Jul
12
comment Can you remove scratches from a lens with peanut butter?
@MichaelClark: Do you have a source for that? I'm fairly certain that's not true. See for example this HowStuffWorks article on resurfacing CDs with toothpaste.
Jul
12
revised Can you remove scratches from a lens with peanut butter?
added 213 characters in body
Jul
12
answered Can you remove scratches from a lens with peanut butter?
Jul
12
comment When it is beneficial take pictures in live view with a Canon 7d?
Somewhat related: Pros and Cons of using a mirrorless camera
May
24
revised Why do some photographers cover up the brand-name on their camera?
Improved grammar
May
24
suggested suggested edit on Why do some photographers cover up the brand-name on their camera?
May
17
revised How do you achieve sharp bokeh circles?
deleted 1 characters in body
May
16
comment What is the “crop factor?”
Interesting to note: there are many sports and nature photographers who actually prefer APS-C over full-frame, because they get that extra zoom "for free" (though it's actually at the expense of less light hitting the sensor, assuming the same megapixels). Crop-factor is also why cell-phone cameras can be made with such incredibly small focal-lengths without looking like a wide-angle lens.
May
16
revised How do you achieve sharp bokeh circles?
deleted 7 characters in body