The Sleeping Giant's Sea Lion

by Jakub

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6,208 reputation
922
bio website
location Oslo, Norway
age 43
visits member for 3 years, 8 months
seen 31 mins ago

Software engineer, hobby photographer and model-builder.


Sep
24
awarded  Autobiographer
Sep
12
comment Clear container to take photographs through
Polarizers are not 100% effective, unfortunately, although it can get a LOT better with one. However, to get the reflection-reducing effect at all you have to shoot at a particular angle to the reflecting surface plusminus not a lot. It is not a panacea.
Sep
10
comment Why do macro lenses have such recessed front elements?
...and consider what would happen if the inner and outer tubes were much shorter and the lens elements were in the same position as they are today. At minimum extension it would not matter much, but at maximum extension the structure would inevitably be kinda wobbly. Plastic is cheap, so why go there...
Sep
10
comment Why do macro lenses have such recessed front elements?
I agree with Imre... look at the photos in the question of the 90mm macro at minimum versus full extension. At full extension, the front element is located somewhere around the end of the fixed part of the lens housing, well supported by the lens structure. The excess bits of plastic in the inner tube in front of the front element seem to be there simply as padding to keep everything nicely aligned when the lens is at minimum extension, when the front element is very close to the camera body.
Aug
21
answered Low light photography with lens limitation
Aug
21
comment Focusing Screen for a Canon 60D using an 85mm f1.2 lens
Probably wise... I can't help you there, I do have an 85/1.2L (mark one) but am using it on a full-frame 1DsII with the Canon super precision matte screen. I do rely on autofocus, the 85L is painfully slow to focus in manual mode. Not that it is pleasantly fast to autofocus either of course :)
Aug
20
revised Focusing Screen for a Canon 60D using an 85mm f1.2 lens
Corrected wordage.
Aug
20
answered Focusing Screen for a Canon 60D using an 85mm f1.2 lens
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