Open

by damned truths

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

8,377 reputation
1129
bio website sequoiagrove.dk
location Denmark
age
visits member for 2 years, 3 months
seen 2 days ago

I work with R&D in computer vision and am an amateur photographer. I developed my own image viewer and editor, too, because I am tired of moving images around in different software and it gives me a common platform for including my own algorithms and formats used in my research.

http://500px.com/sequoiagrovevisions

My gear:

  • List item
  • Canon 40D with battery grip
  • Speedlite 430ex
  • Canon 28mm 1.8 USM, Pentax SMC M 50mm 1.4, Canon 85mm 1.8, Carl Zeiss jena 135mm 3.5, Sigma 17-50mm 2.8 EX OS HSM, Sigma 10-20 HSM, Helios 44-2 58mm F2
  • Image View Plus More (sorting, viewing, slideshows, raw developing, adjustments, retouching, all-in-one)
  • Photoshop Elements
  • Upgrade wish list: 14mm F2.8, 35mm 1.4L, Canon 400 F4, Jupiter9 85mm F2 or Samyang 85mm 1.4, Canon 70-200 F/x L. Canon 60mm Macro

2d
comment Will a charger for Canon 60D batteries work on 40D batteries?
well you can record video now :)
Dec
8
comment What are the advantages and disadvantages of using a 3rd party battery?
I have bad experience with the performance of 3rd party for canon.
Dec
7
comment How does software that extracts or views EXIF work?
This question appears to be off-topic because it is about most probably programming.
Dec
7
comment How does software that extracts or views EXIF work?
why would any research paper tell this? Research is about creating knowledge, not explain how to read known knowledge from a well defined known protocol. Just look up the protocol. Simple as that. exiv2.org/tags.html
Nov
21
comment What makes this Eggleston picture great?
I dont like it. And I can say why: the background has an imbalanced amount of clutter. (the buildings) and he didnt blur it with narrow DOF.
Nov
14
comment Aerial Camera Ground Footprint Calculation
This question appears to be off-topic because it is about computer vision
Oct
27
comment Shadowless product photography
yeah ok, I guess a theoretic point can be smaller than the sensor, I was thinking of natural point sources that are usually larger than the sensor, and so are all professional coaxial lights I know of. Still, the inital case was a photo you saw that has shadows. and it is not due to theoretic zero radius point sources, but that the light is not coaxial.
Oct
27
comment Shadowless product photography
A point source coaxial light still would not cast a shadow. The reason that you see shadows in that other image is because the splitter/mirror turns part of the light coaxial (assuming correct angle), but the direct light from it from the side is not blocked, so that side light created shadows. The reason coaxial light cannot create shadows in the image is that that anything that occludes the light , will also occlude the field of view, so the cmaera cannot see the shadows. THe shadows are there, but the image will not show them.
Oct
26
comment Shadowless product photography
thats because it is not coaxial light. it is mixed sources. Real coaxial light is contained. falcon-illumination.com/_images/structure/flfv%20(1).gif
Oct
16
comment How to photograph a lightbulb?
i like the first one best.
Oct
5
comment Was there ever a photo that made people cry?
Actually, that arbeit macht frei gave me shivers. But thats because I know all that is behind it. The pipers dont give me an emotional reaction, other than I think it is great that people keep up traditions like that, even if it looks funny. I listen to some good deaht metal bands with bagpipes, too.
Sep
23
comment How does focal length determine lens quality?
it doesnt say anything about quality.
Sep
21
comment When should I consider an image sharp?
photo sharpness is normally disappointing viewed 100%. Which means: dont.
Sep
16
comment How do zoom, magnification, and focal length relate?
you should add that the X:Y specs is given at minimum focus distance. Go away farther and you wont achieve it.
Sep
16
comment I tried to use the “Sunny 16 rule” but it didn't work, why?
The first is better. just need to fiddle with the dynamic range in the raw file. .
Aug
11
comment Too much “Grain” in photos
it says 200-2000 iso
Jul
18
comment How can I get perfect sharpness when shooting still art?
adjustments to you list: try F 5.6-F8, and use mirror lockup, delayed shot (timed). since nothing is moving stick to iso 100. You are shooting raw right? Your images are kinda low contrast. increasing contrast also aids the perception of sharpness.
Jul
8
comment Which of these lenses will work?
why do you think I think the difference is sensor size? ofc it is distance, duh. thats why min focus distance is important to minimize to achieve 1:1. total magnification? when talking about 1:1 ( or more) macro lenses, everything that goes on after projection through the lens is irrelevant. Magnification by the lens increase quality, magnification after sampling decrease quality (ie dec. resolution, e.g. printing the same image at 300 DPI or 150 DPI). You cant pool those two magnification techniques into one "total mag.". Projecting larger is really the best way to gain IQ.
Jul
7
comment Which of these lenses will work?
the trends Ive seen emerge is (dont know enough optics theory to state this IS the truth): the optics has a tendency to blur before you get to record anything if its not 1:1 squeezing the light is hard. in the link above notice how significantly sharper it gets at 1:1 vs 1:2 and 2:3. thats not the higher pixel count per inch alone that makes this sudden focus. thats also why the same lens performs better on FF than crop even if the crop has same/more pixels.
Jul
7
comment Which of these lenses will work?
If "crop factors" were important in talk about macro, then you could say that a FF with any lens could give you 10:1 or 29:1 if you crop the image. In macro magnification is the major spec. thats why specialty macro lenses like navitar and zeiss use magnification in the spec sheets instead of focal length. It doesnt matter which camera you put them on. It doesnt change the magnification. It just changes your FOV.