It's a bird

by Vian Esterhuizen

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1,613 reputation
921
bio website
location ND
age 31
visits member for 3 years
seen May 18 at 19:43

Feb
9
suggested approved edit on Why do my photos “glow”?
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
awarded  Enlightened
Jan
27
awarded  Nice Answer
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
27
asked In what practical applications is the position of the sensor plane relevant?
Jan
27
answered How can I find the sensor position on my camera?
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.
Jan
23
revised Is it normal for a fast prime to exhibit purple fringing in middle of the image?
added 8 characters in body
Jan
23
revised Is it normal for a fast prime to exhibit purple fringing in middle of the image?
added 107 characters in body
Jan
23
answered Is it normal for a fast prime to exhibit purple fringing in middle of the image?
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?