Alley in Pisa, Italy

by Lars Kotthoff

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6,158 reputation
921
bio website
location Oslo, Norway
age 43
visits member for 3 years, 6 months
seen 7 hours ago

Software engineer, hobby photographer and model-builder.


Jul
23
awarded  Nice Answer
Jun
23
comment Compability of Kenko DGX PR0300 2.0X C-AF F4.5 for Canon and a Canon 55-250mm lens
The AF in most Canon cameras just plain stop working at all once the camera knows that it is shooting a lens with worse than f/5.6 max aperture... and they don't do this to be mean, but because it just plain doesn't work very well with such a small aperture.
Jun
23
answered I am looking for a 2X extender for a Canon 100mm EF 2.8 (non L series)
Jun
23
comment Compability of Kenko DGX PR0300 2.0X C-AF F4.5 for Canon and a Canon 55-250mm lens
Depends on whether the converter tells the camera that it is there or not. If no, the camera will try to AF... in good light and with a high-contrast subject it may even succeed. If yes, the camera will not even try.
Jun
21
answered Compability of Kenko DGX PR0300 2.0X C-AF F4.5 for Canon and a Canon 55-250mm lens
Jun
4
revised How does a camera meter light when the shutter is closed?
Mistook one poster's name for another. Corrected.
Jun
4
answered How does a camera meter light when the shutter is closed?
May
31
answered Reduce photo size to less than 20kb
May
30
comment Canon 6D lensflare
Are you using a filter (UV or "protective") on your lenses when shooting in the dark like this? If so, that may be the culprit - just remove the filter and try again.
May
26
reviewed Approve suggested edit on What's the difference between colour space and bit depth?
May
21
awarded  Enlightened
May
21
awarded  Nice Answer
May
19
awarded  Custodian
May
19
reviewed Approve suggested edit on How can I make the text in this photograph of an ancient column more readable?
May
12
answered Can slightly misaligned focus points and focus screen result in focusing issues?
Mar
19
comment How can you photograph backlit scenes without getting lens reflections/flare?
If the OP is using a filter he should definitely remove it when shooting into the sun like this, never mind its quality. It can do no good whatsoever to have it there, and it can very well be detrimental.
Mar
2
answered Lightroom Crashes on Launch
Feb
25
comment Why are digital cameras said to suffer more from chromatic aberration than film cameras?
There is also the rather thick (~1mm or so) antialiasing/UV/IR filter glass that sits directly in front of the sensor. In the corners of the sensor, incoming light will hit at an acute angle (unless the lens is telecentric) and this can do nasty things to the colours. Especially on say some Leica M-mount wideangle lenses where a small-diameter rear element is deeply recessed into the, well, not the "mirror house" but the corresponding cavity in the camera, close to the film plane. This doesn't happen with film. Microlenses can only do so much to overcome this.
Feb
9
answered What camera defect would cause a shot to be exposed on one half of the frame and not the other?
Jan
25
awarded  Yearling