Serene Life

by garik

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2,500 reputation
1919
bio website
location Norway
age
visits member for 3 years, 5 months
seen 13 hours ago

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.


Sep
30
comment Is it possible to get an interval precise up to 2 decimal places using a (software) intervalometer?
Triggertrap can probably do it. You'll need an Android or iOS device and a trigger dongle for the camera, about $40. Use the timelapse function, it can be set in intervals of 1/100th of a second. This is a comment rather than a reply since I don't know whether you'll get 10ms accuracy in practice, or whether the LP player RPM will stay that accurate over 12 hours. For accuracy I'd go with Russell's suggestion.
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
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.
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
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
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.
Jul
19
comment Nikkor lenses: is there any means to know if a lense mount is in metal or plastic
I'd ask both you and Rockwell: Why does it matter? Plastic can be lighter, cheaper and adequately strong. I think the "plastic is bad" phenomenon is similar to the "digital is bad" known from digital/film photography or vinyl/CD music: Based more on emotions ("when I was young we used to...") than on any measurable fact. (I remember one guy complaining about early CDs that they didn't have the vinyl scratches before the music started, which he had grown accustomed to as a sort of Pavlovian anticipatory trigger.) If you still want metal, Rockwell's site is the best that I know of.
Jul
17
comment What are the clues to look at regarding how long Canon's EF/EF-S lens mount might be current?
@Aphex5 Too much opinion IMO. "Never ever" is obviously false, "not this year" is obviously true, anything between is a random guess. The Canon FD mount lasted 16 years. The Nikon F-mount has lasted 54 years so far, the Canon EF-mount 26 years. Changing mounts is enormously expensive for the manufacturers, as they have no lenses for their new mount, and spend a decade or so to fill the catalog. They will change eventually, when forced to, but will hold on to their mount as long as possible. For EF-S, I'd be more worried that I might want a full frame camera within the next decade or so.
Jul
12
comment How do sharpening tools work?
@jwenting What's the difference? Wikipedia says that edge enhancement works by "increasing the image contrast in the area immediately around the edge". Granted that it's local rather than global contrast. But it's still contrast, isn't it?
Jul
11
comment Looking for lighting for 3-light setup
It's possible. According to a Lensrentals blog post - lensrentals.com/blog/2013/07/… - they made a 43,000 Ws flash unit during WWII for air reconnaisance, it could illuminate subjects 6 km (4 miles) away. Weight more than a metric ton, though, so not very portable. In practice, I think I would buy a few 1000W worklights and a diesel generator, and send an assistant to position them at the mountaintop, communicating over cell phone or walkie-talkie. Would be semi-portable, at least.
Jul
9
comment What do the markings on a Tamron CCTV lens mean?
@Mzk 1) Formula for f-number is the same, independent of DSLR or CCTV. 2) Some DSLR lenses cannot change aperture directly on the lens, only indirectly from the camera. But 3) it appears that the manual iris and auto iris specifications are for two different lens models - one manual, one auto. So I guess yours is the auto iris model. See their catalog (pdf) - one auto, one manual iris version of each lens.