Sunset in Kruger

by MrFrench

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1,593 reputation
819
bio website
location ND
age 31
visits member for 2 years, 10 months
seen Apr 26 at 16:19

Feb
26
comment How to match colors on photographs stitched together?
@WilliamKF "M" setting is not sufficient. Also use identical white balance settings when converting the raw files.
Feb
26
comment How to match colors on photographs stitched together?
Just google for "stitch panorama in photoshop" and you'll find everything you need. CS6 does have this feature. Key things are Edit -> Auto Align and Edit -> Auto Blend. Auto-Blend does sort of what you're asking for. Actually it will cut the layers along a line chosen to minimize the differences between them, it will usually look seamless. I haven't used this with your method though (moving camera position), only with rotating the camera while its position is fixed.
Feb
26
comment What should I look for in a wide angle lens?
I think yes: many more wide angle photos will have the sun in them than photos taken with narrower lenses.
Feb
26
comment How to match colors on photographs stitched together?
Are you using Photoshop's automated stitcher? It should take care of this automatically. Or is it producing bad results in other ways?
Feb
25
comment What should I look for in a wide angle lens?
What about flare resistance?
Feb
18
comment Nikon D60: Autofocus of two AF-S lenses not working anymore after using another lens
So you can see the focus ring on your 18-55 rotating, but the camera never achieves proper focus? It sounds like the camera cannot detect when the image is in focus anymore. What happens when you turn on the rangefinder (page 116 in the manual) and set the lens to manual focus? Does it ever indicate correct focus as you are focusing manually? If not, there may be a problem with the AF system.
Feb
13
comment Why is the Nikon 70-300mm f/4.5-5.6G ED IF AF-S VR twice as costly as Nikon 55-300mm f/4.5-5.6G ED VR AF-S DX?
The 70-300 focuses much, much faster than the 55-300. The 70-300 feels almost instantaneous at large focus distances. With the 55-300 one can watch the focus slowly change in the viewfinder.
Feb
13
comment External power for compact camera?
Is your kit also for Nikon cameras? Do you know if the plug it uses is a special proprietary one or a standard USB? (EN-EL12 uses less than 5 V). I'm ultimately looking to power both the camera and a Raspberry Pi from a large USB-compatible 5 V external battery.
Feb
13
comment How can I detect upscaled photos?
You can try taking the Fourier transform of the image and looking at the presence of high frequency components. Upscaled images won't have much of high-frequency components. Beware though that JPEG compression also removes some of these. I just tried this method and it seems to be fairly sensitive to down- then up-scaling. It will take a fair bit of work to make it reliable though.
Feb
13
comment External power for compact camera?
I wonder how you found that. I just spent 20 minutes googling in the hope of finding something like this!
Feb
11
comment What *exactly* is white balance?
There's some interesting info here, e.g. page 58 and onwards. It's a pity I don't have time to read it right now :(
Feb
11
comment What *exactly* is white balance?
Sorry if my comment lead you to believe that I have the answers, I don't :) I don't understand how human perception works, and this is an interesting question. A keyword you can search for is "chromatic adaptation". The scientific field studying perception is called "psychophysics".
Feb
11
comment What *exactly* is white balance?
"Why do we 'correct' this" <-- because our eyes (or rather brains) do as well. What's relevant for humans (or other creatures) is primarily the colour of objects, not the colour of light reflected by objects. So the brain corrects for light sources of different colours to be able to recognize colours/objects better. The purpose of white balance correction in cameras is to imitate this and produce photos that look "natural". There's no fundamental laws of physics behind this, it's all about imitating our human perception.
Feb
4
comment In what practical applications is the position of the sensor plane relevant?
Can you elaborate on how? I can see how it could be done for a thin lens, assuming we know the precise focal length. But with a complex optical system made of many (not so thin) lens elements, it's not clear to me how this would be done.
Jan
27
comment In what practical applications is the position of the sensor plane relevant?
@user35658 Thanks, that's interesting. So is that how people used to work with macro before TTL metering? Why don't you post an answer?
Jan
27
comment How can I find the sensor position on my camera?
I answered yours, can you answer mine? :-)
Jan
26
comment How does autofocus deal with the time to change aperture and raise mirror?
@Alec I am sorry, I should have not appeared so argumentative. I deleted irrelevant comments. "Phase detect AF" works the same way as split-prism focusing screens, which you can google for if you are interested.
Jan
26
comment How does autofocus deal with the time to change aperture and raise mirror?
"uses the phase of light and diffraction to work out when it is in focus" <-- this is not correct. The word phase in "phase detect autofocus" refers to something completely different (and yes, I do think it's a stupid name for it, but that's what engineers chose to call it...) It has absolutely nothing to do with the wave nature of light. If you're curious how it works, the illustration in the Wikipedia article is very helpful
Jan
25
comment Does focal length matter for a macro lense when use for close-up photos
The longer the focal length, the further you can be when at 1:1 magnification. This is important when photographing insects that can get startled and fly away. Focal length also determines the angle of view, which doesn't matter if you want to isolate the subject (typical macro), but becomes important if you want to show a creature in its environment. That's only really possible with wide angle lenses which don't usually go to 1:1 magnification. For the usual 60-100 mm range the subject is pretty much isolated.
Jan
23
comment Is it normal for a fast prime to exhibit purple fringing in middle of the image?
Actually axial chromatic aberration (as seen in the OP's example) is not easily fixable. Only lateral CA is. Lateral CA is usually well-corrected on high-end optics, but axial CA is not.