I Dare You!

by peter_budo

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

1,578 reputation
818
bio website
location ND
age 31
visits member for 2 years, 9 months
seen 5 hours ago

Jan
21
comment Is there a correct way to swap lenses?
@MattGrum There's a difference between dust and dust though. Windy sandy beaches come to mind. Silica sand can scratch glass.
Jan
15
comment Shooting full manual during an event or function
@TiaanRossouw I really don't see any advantage to use full manual exept in extreme situations when the camera's metering cannot be used (e.g. very long exposure, astro-landscape, etc.) It certainly doesn't give any "creative control" as some claim. There are three parameters that affect exposure: aperture, shutter speed and ISO. You can set two of them and let the camera adjust the third one. Then you have the choice to use matrix metering and leave the decision fully to the camera, or use spot metering, choose the spot to meter on yourself, and use exposure compensation. This is slower.
Jan
14
comment Shooting full manual during an event or function
What advantage are you hoping to gain from using full manual, ignoring the camera's built-in metering and judging light by eye? From the question I get the impression that you believe that using precise and reliable metering is somehow going to result in worse pictures than just judging "by eye".
Jan
12
comment D7100: How to adjust default settings?
He wants to quality to be reset to RAW instead of JPEG when he presses the two green buttons.
Jan
12
comment D7100: How to adjust default settings?
Wasn't he asking about resetting all setting to defaults, except the quality, which should be kept at RAW?
Jan
12
comment What can you do with Lightroom catalog files if Adobe stops support for Lightroom?
Open source projects get abandoned too. I'd think that a small open source raw converter with only a few hobbyist users is much more likely to become unsupported than the most popular commercial option that many businesses depend on.
Jan
5
comment Why don't sensors on satellites and rovers degrade as quickly as DSLRs on the space station?
"but video cameras last much longer" <- do you have a reference? "sensors on satellites don't degrade as quickly" <- again, do you have a reference? It seems they do degrade, but would be much more expensive and much more trouble to replace. People come and go on the ISS and bringing a new DSLR every couple of years is not particularly costly (compared to full mission costs). That article I linked is precisely about sensor degradation on Hubble.
Jan
5
comment Why don't sensors have a wider aspect ratio?
Also, I find 16:9 a really silly ratio for small laptop screens. It's really meant for watching movies, not for computer work. It works for large high resolution screens where we're likely to arrange windows side by side, but the smaller a screen gets the more awkward it is. Thankfully Apple stayed with the more convenient 16:10 and an iPad has 4:3.
Jan
5
comment Why don't sensors have a wider aspect ratio?
1. Most photos are viewed on a screen, but not fullscreen. They're embedded in articles. 2. We have a wide field of vision, but the area we perceive as sharp and we can focus on is not wide. 3. Most photos don't aim to accurately reproduce human perception; instead they show one subject we focus on. Wide is not usually optimal for this. Nor is it usually the most pleasing one. Paintings are almost never as wide as 16:9 as this is not a good aspect ratio for showing most subjects. 4. Cinema is different: it does aim to fill out your field of view without putting subjects in the edges.
Jan
2
comment Why does “bulb” mode usually rely on holding the shutter button?
I have seen the cable release from your second picture, but not the first. Now "bulb" makes sense.
Jan
2
comment Why does “bulb” mode usually rely on holding the shutter button?
If you keep holding the button, it's not going to be just a couple of jiggles at the start and the beginning. There's a risk of many jiggles during the exposure due to the need to keep holding the button.
Jan
1
comment Does this test chart show that my kit lens front focused?
For more reliable results, focus on markings on a sheet that is strictly perpendicular to the optical axis, and place a separate rules at a tilted angle next to it. Tilting the whole chart is unreliable.
Dec
31
comment How to calculate the correct focal length needed for a subject of a given size and distance?
Suppose you want to frame an object of size a at distance l. Then, roughly, a/l = s/f where s is the sensor size and f is the focal length.
Dec
24
comment How can I take wide angle macro photos with a Nikon APS-C camera?
Thanks for your response. It wasn't clear to me how to determine when an extension tube is too thick to prevent any sort of focusing. With a wide angle lens, the focal length is always shorter than the flange distance, and they have to use something like a retrofocal design. So a thin lens model won't help in figuring out what would happen. I should have though of the obvious solution: just hold the lens in front of the camera without mounting it to test whether an extension tube of a certain thickness would work.
Dec
22
comment How can I take wide angle macro photos with a Nikon APS-C camera?
Anyone voting to close, please read the question carefully first. I thought it was clear that I'm asking for facts on what works, not opinions on what's best. If the question is not clear, please comment.
Dec
20
comment How can I take wide angle macro photos with a Nikon APS-C camera?
This is not a recommendation question. I'm not asking what's the best. I'm asking what works at all (based on first hand experience).
Dec
17
comment Why does L*=0 not correspond to black in the L*a*b* color space?
Maybe easier to see: Manipulate[ ArrayPlot@ Table[LABColor[l, a, b], {a, -1, 1, .05}, {b, -1, 1, .05}], {{l, 0}, -1, 2} ]
Dec
17
comment Why do digital cameras not have an iso rating?
I don't think people will stop and spend time to convince you about this, I certainly won't. However, you could easily do some research using Google to find out for yourself. You might want to read up on Poisson process and shot noise too.
Dec
17
comment Why do digital cameras not have an iso rating?
Digital cameras have an ISO setting. Sensitivity is variable and the maximum ISO is always clearly indicated in the specifications. There's a tradeoff when you increase sensitivity: the picture will have more noise. This is one reason why they don't have the sensitivity fixed at a permanent high value. Also see here cambridgeincolour.com/tutorials/camera-exposure.htm and here cambridgeincolour.com/tutorials/image-noise.htm
Dec
7
comment How does software that extracts or views EXIF work?
Also, many of those tools are open-source, meaning you're free to inspect how they work.