Forgotten in its old age

by Aditya

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4,973 reputation
21944
bio website quantdec.com
location Northeastern US
age 14
visits member for 3 years, 11 months
seen Jun 3 at 13:17

Consultant (environmental and spatial stats a specialty), expert witness, and teacher. I can be reached through (outdated but still valid) links posted on my web site.

Twitter: @WilliamAHuber // ASA-P website: http://amstatphilly.org/


Why waste time learning, when ignorance is instantaneous?

--T(iger) Hobbes.

For any complex problem there is a simple solution. And it's always wrong.

--[Mis?]attributed to H.L. Mencken by Dava Sobel, Longitude.


Nov
6
answered What's that sign with a dot and a number in the view-finder?
Nov
3
comment What is exposure compensation?
Thanks...now I don't feel so guilty about keeping the button on AV and constantly adjusting the EC! (On my EOS 550 there's little difference between this and manual exposure anyway; it's exactly the same set of button presses, but with their roles reversed between aperture priority and shutter speed priority.)
Nov
1
comment Whats the difference between Singh-Ray Vari-ND and cheap Fader-ND filters?
Thanks for the comments on the ND filters. However, so that nobody leaps to unwarranted conclusions, I would like to remark that the technology for a fixed ND filter is completely different from a variable filter, so we can't really generalize from one to the other.
Nov
1
answered Whats the difference between Singh-Ray Vari-ND and cheap Fader-ND filters?
Nov
1
comment Why are wide-angle lenses so much more expensive?
+1 for a superb answer that goes beyond what was asked and introduces ideas and information of general use to all readers.
Oct
30
comment What is the dynamic range comparison between SLR, DSLR, and point & shoot?
@jrista I'm still a neophyte with digital processing and so don't pretend to speak with any authority, but I have been paying attention to the EV range found in my RAW files, of which I now have several thousand. The range depends strongly on the subject and the lighting. In some cases with uniform lighting, low-contrast subjects, and telephoto lenses it's only 4-5 stops, but in others--especially landscapes exposed not to blow the highlights in sky and clouds--there often is a range of just over 10 EV that can be brought out. (EOS 550.)
Oct
30
comment What is the dynamic range comparison between SLR, DSLR, and point & shoot?
The human eye has that many f-stops only after factoring in adjusting the pupil size ("aperture") and other neurological "processing." (In any given scene it's not much more than 7 stops [very roughly], as you can confirm by considering how indistinguishable the details of a shaded area are when you're in the bright sunlight.) It's not a valid comparison unless you want to look at the entire gamut of exposure available in the camera, which is close to 24 stops (or greater, depending on how much noise you can tolerate).
Oct
30
awarded  Critic
Oct
30
answered Where to buy cheap UV filters online?
Oct
29
comment Which setup should I choose for taking pictures of Trick-or-Treaters tonight?
@jrista Older 35 mm cameras (SLRs and rangefinders) typically came with primes in the 47-55 mm focal length range with maximum apertures a little less than f/2; f/1.9, f/1.8, and f/1.7 were all common. (For a premium you could get them in the f/1.2 - f/1.4 range too, of course, but that wasn't standard.) My first one, a Konica rangefinder, had a max of f/1.9. It also had detents at f/2 and up as usual in half-stop increments. I always figured that although f/1.9 wasn't really any different from f/2--it's 1/7 of a stop wider--it helped sell cameras ;-).
Oct
28
comment What is an effective exposure strategy?
Have you read Ansel Adams' book "The Print"? It picks up at the point after the picture has been taken. Taking it as given that you did not screw up the original composition and that you exposed correctly, he argues that the process of converting the exposed film (read "RAW file" nowadays) to a final image ("fine print") is where the artistic expression lies. I find this book's advice, although technically outmoded, is still relevant and inspiring for digital photography.
Oct
28
comment What size lens is recommended for flying bird photography?
@jrista: No harm done; I just didn't want anyone to get their hopes up prematurely ;-). I used teleconverters decades ago (to double a 100-200 zoom to 200-400) but after the initial thrill of getting that long reach, the gadgets just sat in a drawer: the darkness of an f/5.6 aperture, the corner softness, and the overall loss of contrast were just too dissatisfying. Now, I find that the digital "zooming" (i.e., cropping) allowed by these 21 Mp sensors (EOS 550 and D7) can be good enough for decent songbird pictures with a 200 mm lens if you keep the ISO down.
Oct
28
comment What size lens is recommended for flying bird photography?
A 2X teleconverter will indeed produce a 140-400 mm focal length range, but it doubles all f-stops, giving a minimum of f/5.6, not f/4.
Oct
25
comment How important is ISO speed?
Are you asking about ISO "speed" (which measures sensor sensitivity) or shutter "speed" (which is the exposure time in [reciprocal] seconds)?
Oct
25
awarded  Enthusiast
Oct
23
answered Why is the depth-of-field preview in the optical viewfinder of my Canon 500D inaccurate?
Oct
22
answered Manual photography cheat sheet — where can I find one, or what should be on it?
Oct
22
awarded  Enlightened
Oct
21
awarded  Good Answer
Oct
21
awarded  Commentator