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by Jakub

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18,471 reputation
33871
bio website guffa.com
location Sweden
age 44
visits member for 5 years
seen 2 hours ago

The name is Göran Andersson. I work as a programmer and have photography as a hobby.

I started with a fix-focus point-and-pray camera in the late eighties, and have worked my way through film SLRs and darkrooms to the DSLR that I use now.

Primary equipment:

  • Canon EOS 5D mark II
  • Canon EF 24-70 mm, f 2.8 L USM
  • Canon EF 28-135 mm, f 3.5-5.6 IS USM
  • Canon EF 70-300 mm, f 4.5-5.6 DO IS USM
  • Canon EF 50mm, f 1.4
  • Sigma EX 12-24 mm, f 4.5-5.6 DG HSM
  • Sigma EX 50-500 mm, f 4-6,3 APO DG HSM
  • Lensbaby 2.0 + Edge 80
  • Canon Speedlite 550EX
  • Manfrotto 728B tripod
  • Manfrotto 776YB monopod

1h
comment motor keeps working although i´ve got the focus (canon 400 2.8 usm is)
That sounds liek continuous focus, like you changed the focusing mode, or switched to the sport image program.
Jul
15
awarded  Yearling
Jun
28
awarded  Enlightened
Jun
28
awarded  Nice Answer
May
6
awarded  Nice Answer
May
5
answered Is direct sunlight reflected from white animal fur affected by a polarizer?
May
2
revised Can I extend dynamic range by underexposing and then downsampling (“binning”) my images?
deleted 1 character in body
May
2
answered Can I extend dynamic range by underexposing and then downsampling (“binning”) my images?
Apr
19
answered Why are images shot in monochrome mode in color when I download them?
Apr
11
revised What is the cause of black bars on a photo of AMOLED display?
added 226 characters in body
Apr
11
comment What is the cause of black bars on a photo of AMOLED display?
@Lathejockey81: The display is actually blinking, that's what the PWM is doing. You can see that in the movement in the 1/40s and 1/100s exposures; the buttons at the bottom is captured as a continuous blur, while the screen is captured as separate frames, with a significant blackout between them. You can also see the evidence of the vertical sweep, as the first and last frames start and end in the middle of the frame.
Apr
9
comment What is the cause of black bars on a photo of AMOLED display?
@Lathejockey81: In theory the pixels in an LCD screen could be changed individually, but that's not done. Why? Because it would mean that you would send as much addressing information to the screen as color information, doubling the data that need to be sent to update the screen. A mobile screen is updated just like any other LCD screen, that's why tripple buffering and VSYNC was introduced in Android 4 to make animations smoother.
Apr
9
comment What is the cause of black bars on a photo of AMOLED display?
@DavidBalažic: Yes, it's the rolling shutter in combination with the refresh rate that causes different patterns. The pattern will be multiple bands unless you align the shutter movement with how the screen refresh moves.
Apr
9
revised What is the cause of black bars on a photo of AMOLED display?
added 1 character in body
Apr
7
awarded  Enlightened
Apr
7
awarded  Nice Answer
Apr
6
answered What is the cause of black bars on a photo of AMOLED display?
Apr
1
comment Color issue: studio images have a pink hue
How do you determine that the images have a color shift? Is it possible that it's actually your computer screen that shows them incorrectly?
Mar
31
revised How do I stack two photos in Photoshop to reduce noise?
added 158 characters in body
Mar
31
answered How do I stack two photos in Photoshop to reduce noise?