Alley in Pisa, Italy

by Lars Kotthoff

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2,410 reputation
1917
bio website
location Norway
age
visits member for 3 years, 2 months
seen Jun 5 at 1:25

Hobbyist photographer back in the '70s and '80s. Took my first photo when I was five years old, got an SLR when I was ten. (Film, all manual, handheld light meter, we had a darkroom in the basement.)
Shelved the hobby for a couple of decades. Returned recently, this time with digital equipment.

Jack of many trades (and master of none), but I have a professional background in software development.


Jul
9
awarded  Popular Question
May
30
comment How to change aperture in manual mode on an entry-level Nikon SLR?
One more thing: Turn off Auto ISO, or the camera will compensate by adjusting the ISO. (Assuming the D3200 works similar to my D5100.) This doesn't affect the aperture, but it does affect the exposure, the brightness you see in the picture.
May
22
awarded  Yearling
May
20
comment Relevance of absolute light power in studio object photography?
I meant subject rather than room: E.g 50 W bulbs in the softbox should give the same contrast as long as you can reduce the ambient light to 3-4 stops below the light from the softbox. In daytime that might require a windowless room or heavy curtains, but it's doable.
May
17
comment Relevance of absolute light power in studio object photography?
Good point. Although if you use a 50 W (equivalent) light bulb to light up the room, I assume that the ambient light is even lower. So perhaps the absolute light level doesn't matter, but the relative light level certainly does.
May
17
comment Relevance of absolute light power in studio object photography?
@zsz85 I guess it's because most studios also shoot people, and if you're at f/16 (for depth of field) and ISO 100 (for low noise), few living things can hold perfectly still for that long. In short, they want to be able to freeze motion.
May
17
answered Relevance of absolute light power in studio object photography?
Mar
25
awarded  Good Answer
Jan
25
comment How useful is silica gel for protecting SLR cameras against condensation from changes in temperature?
On battery: batteryuniversity says "Batteries that would provide 100 percent capacity at 27°C (80°F) will typically deliver only 50 percent at –18°C (0°F)" and "at –20°C (–4°F) most nickel-, lead- and lithium-based batteries stop functioning". 50% loss at -18°C matches well with my experience.
Jan
25
comment Are there digital cameras with a RGBW sensor?
I couldn't find any cameras, but there are two 2007 patents on RGBW sensors. Maybe Fujifilm just wanted to avoid an existing patent? Interesting sensor, but writing the de-"Bayering" algorithm looks rather challenging...
Jan
24
comment What cellphone is the best for photographs?
The Nokia 1020 is the best that there is for now. See Smartphones vs DSLRs vs film. But for "zoom in very far while keeping the high definiton" - sorry, then you'll need something more than a phone.
Jan
20
answered How to take a “bird's eye view” of a product at home?
Jan
20
comment How to take a “bird's eye view” of a product at home?
So you want to mount the camera higher up than most tripods will go, with some flexibility for adjustments? A C-stand, a super clamp and a tripod head should do it. Plus a sandbag for the base of the stand, so it doesn't tip over when you extend the arm. See discussion here.
Jan
12
comment Can I make a Nikon AF Nikkor 50mm 1:1.4D auto focus on a Nikon D3100?
For accurate manual focus, use the live view zoom function.
Jan
8
comment Is optical image stabilization a necessary feature for any lens?
+1 Bird-watching: WANT for birds sitting still. DON'T CARE for birds in flight, since you'll be at 1/250 or higher anyway to freeze the bird, and the VR/OS can interfere with the panning required to follow the flight.
Jan
6
answered Is it normal for a Nikon D5100 to freeze after several photos are taken in a row?
Jan
5
comment What is the benefit of a vari-angle LCD monitor on a camera?
Yes, you can take a self portrait (I have a D5100). Focus: Either manual prefocus or leave it to the AF (works in good light, not so much in low light/indoors). Set the remaining controls before you move in front of the camera. In general, IMHO, the articulated LCD is the single most useful feature on the D5100. I'm surprised that so few cameras have them.
Oct
28
comment Is GPU or CPU more important for Photoshop and Lightroom?
@Itai Agree, as a general observation, that "if something is not required does not mean that it won't increase performance". Disagreee with the implication that buying the $1000 nVidia Titan graphics card might improve Lightroom performance over integrated graphics (whatever ships with any computer that's capable of showing the desktop) in any perceptible way: If Lightroom doesn't use the GPU, it doesn't matter which graphics you have. For Photoshop, improvements are limited to the specific features Adobe lists as "these use the GPU". I'd go with more CPU, it's more generally applicable.
Aug
14
comment What is the “Rule of 600” in astrophotography?
But if you want to use the extra resolution from a high-resolution camera, e.g. by cropping more, printing larger, viewing closer, or viewing at 100% on the computer, the higher resolution will reveal more blur, so you need a stricter rule. This goes for DOF and handholdable shutter speeds as well.
Aug
14
comment What is the “Rule of 600” in astrophotography?
@Jez'r570 The "rule of 600" is like "1/focal length" for handheld shutter speed and "d/1500" for circle of confusion: The formulas ignore the resolution, and are calculated from how much detail you can see with the naked eye on a "standard size print" at "standard viewing distance". If standard size print and standard viewing distance is how you use your pictures, the camera resolution doesn't matter.