Alley in Pisa, Italy

by Lars Kotthoff

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8,199 reputation
825
bio website sequoiagrove.dk
location Denmark
age
visits member for 1 year, 10 months
seen 4 hours 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

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
11
answered Which ND filter should I get for daytime bokeh-effect on video?
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.
Jul
7
comment Which of these lenses will work?
dpreview.com/articles/6519974919/… "What happens if the subject is the same size in real life as its projection? If we shoot a 1cm fly and its projection on the sensor measures 1cm as well, the magnification is 1:1. The 1:1 ratio has an important meaning for macro enthusiasts. Technically speaking, macro photography means shooting at a magnification ratio of at least 1:1. Therefore, a 'true' macro lens has the ability to produce a magnification ratio of 1:1, or higher."
Jul
7
comment Which of these lenses will work?
1:1 is one to one, whether you have a 1mm sensor or a 10 feet sensor.
Jul
7
answered Which of these lenses will work?
Jul
7
comment Do I have to resample images when resizing them (smaller)?
if this about a checkbox in a program, or image processing techniques?
Jul
6
comment What is considered high quality bokeh?
to me the shape is the contours, inner (if present) and outer, and the texture incl. light distribution.
Jul
5
comment What is considered high quality bokeh?
the doughnut shape from mirror lenses is in fact part of what we are talking about with "the shape of the bokeh".
Jul
5
reviewed Approve suggested edit on What is considered high quality bokeh?
Jul
4
revised What is considered high quality bokeh?
added 287 characters in body
Jul
4
revised What is considered high quality bokeh?
added 179 characters in body
Jul
4
answered What is considered high quality bokeh?
Jul
3
reviewed Approve suggested edit on Is a JPEG image uncompressed to bitmap prior to displaying it on the screen
Jul
3
comment How to align several pictures in LR?
you need a full 3D representation to change the angle in software. 2D warping only works on planes.
Jun
30
answered Will a Soligor 28-200 mm lens fit on a Canon T3i body?
Jun
30
revised How do extension tubes affect focusing distance?
added 527 characters in body
Jun
30
revised How do extension tubes affect focusing distance?
added 513 characters in body