Red and Blue

by Gordon

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visits member for 2 years, 4 months
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Mar
11
comment Why don't we focus at the nearest hyperfocal distance to get everything in focus?
The hyperfocal distance is the nearest focus distance where infinity is still in acceptable focus. Focus any nearer, and infinity won't be in focus anymore. If, on the other hand, you're not interested in far away objects and only want eg. the three objects in your example in focus, by all means focus closer.
Feb
12
comment What *exactly* is white balance?
@Myridium The thing is - when you're looking at a white object illuminated by a 3000K incandescent bulb, your brain knows the object is white because it compensates for the ambient yellowish color cast (and tungsten light is objectively very yellow-orange even though we think of it as "white".) However, when you're looking at a photo with a too warm white balance it is going to look wrong because in that case it is indeed the photo that's off-white and not the ambient light in the environment you're looking at the photo in.
Jan
12
awarded  Yearling
Jan
7
comment Where do rays of light from one point strike the film?
You might find these flash applets and other course material from Stanford's CS178 Digital Photography course quite illuminating, even though the source code is apparently not available.
Dec
26
comment How well will a nonweatherproof Canon Rebel DSLR hold up in the cold and snow?
Officially most cameras seem to be certified only down to zero degrees Celsius. This is a very conservative lower bound and as a Finn I'd be seriously pissed off if my camera couldn't handle shooting outside in the winter. Fortunately, in practice DSLRs can take -20 or -30 like champs - if anything, the cold will mitigate thermal noise in long exposures. Battery life is an issue, though.
Nov
9
answered How many stops are there between 1/4000 and 1" shutter speeds
Oct
21
comment Why is it called ISO “speed”?
Equivalently, lenses can be "fast" or "slow" corresponding to their maximum aperture.
Sep
28
answered Why has my camera stopped taking pictures in low light?
Sep
28
comment Does the Sony A7 have a way to automatically adjust exposure parameters with a button press in M mode?
In M mode, your camera should still give you a meter reading, so even if there's no special button for that, you could manually adjust the shutter/aperture to match what the camera tells you.
Sep
7
comment Can studio light be as good as sunlight?
Yes, sunlight is blackbody radiation and has a nice continuous spectral distribution. But so do incandescent/halogen bulbs! Fluorescent lamps and "white" led bulbs do have discrete spectra which can be a problem with regard to faithful reproduction of colors, so it certainly helps to pay attention to what sort of lamps you choose when creating your lighting setup.
Sep
7
comment Can studio light be as good as sunlight?
I'd say the best source of light is whatever allows you to get the photo you want! Daylight is notoriously tricky, and direct sunlight is almost always way too harsh to be useful for portraits, for example.
Aug
20
comment Why the faces in the corner tends to skew a bit in almost all smartphone cameras
I think the skew @Java_User means is actually caused by rectilinearity itself - the corners are "stretched" in a wide angle view, and any barrel distortion in this case would actually help undistort the shapes somewhat! (Specifically, it would help preserve areas and angles at the expense of distorting straight lines.)
Aug
18
comment How can I make dark images stand out when displayed on a website with a dark background?
Instead of Photoshop, if you can influence the web page styling, you can use CSS box-shadow (just use a bright color to get a glow instead of a shadow).
Aug
18
comment How can I make dark images stand out when displayed on a website with a dark background?
Usually a dark background makes photos pop more when viewed on a backlit screen - if not that might be a sign that your photos are underexposed?
Aug
13
answered Is the distance scale on a lens linear?
Aug
12
comment Is the distance scale on a lens linear?
The scale is hyperbolic - it maps the bounded range of distance scale positions onto the infinite range of focus distances [mfd, ∞] where mfd is the minimum focus distance. Unfortunately I'm too tired right now to figure out the math to calculate the distance scale position corresponding to an arbitrary focus distance :/
Aug
12
comment Is there an “optimal” background distance when striving for a minimally distracting background?
Yeah, I suppose this was more of an exercise in thinking aloud (and not quite thinking through) than a "proper" question from my part. Still, the answer and comments were helpful, thank you, and sorry about the delay in accepting!
Aug
12
accepted Is there an “optimal” background distance when striving for a minimally distracting background?
Aug
12
comment Astrophotography with an 800mm
And Jupiter! Its angular diameter is always greater than Mars's, and on average greater than Venus's. It's also fairly easy to resolve the Galilean moons as points of light around Jupiter.
Aug
12
comment What is the reason of “banded” bokeh on Sony a7?
I'm pretty sure it's just those lenses - it's hard to see how the camera body would affect the bokeh rendition in any obvious manner.