India Point Park

India Point Park
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Mar
13
awarded  Notable Question
Mar
11
reviewed Approve What do resolution figures mean in lens specifications?
Mar
11
comment What do resolution figures mean in lens specifications?
Resolving is what produces the resolution of your output image. Oversampling has to do with how spatial frequencies mesh. Since the output resolution is the result of a convolution, there is no such thing as one thing outresolving another...however it is possible for a sensor to oversample the spatial frequencies of a lens. Also note...oversampling is generally considered for a given contrast ratio...such as MTF50. Lens resolving power increases as contrast drops...at MTF10, lenses resolve FAR higher resolution at most apertures than any current sensor, assuming they are diffraction limited.
Mar
11
comment What do resolution figures mean in lens specifications?
Yes, it is better when your oversampling. There is something called the Nyquist Rate, which is the minimum sampling rate at which you can minimally approximate an analog signal with any decent accuracy. For audio signals, the nyquist rate is 2x, or double the frequency of the audio. For spatial frequencies, it's actually 3.3x, when you account for the second dimension. That is, again, the MINIMUM sampling rate to get a decent approximation. You want to sample more than that for best results. Now, oversampling is not the same thing as outresolving, note that. ;)
Mar
11
answered What do resolution figures mean in lens specifications?
Mar
11
comment What do resolution figures mean in lens specifications?
It is unlikely that any current sensor outresolves modern, current lenses that are on the market. The problem with a lot of lens tests is that they are tested on current cameras. That imposes a convolution problem, where the output resolution of the system as a whole is less than either the resolution of the sensor or the resolution of the lens. Resolution is not some concrete thing either...it doesn't just stop...it fades. At MTF50, most modern lenses at diffraction-limited apertures are good, at MTF10 they are phenomenal.
Mar
10
answered How can I colorize my astrophotography?
Mar
7
awarded  Notable Question
Mar
6
comment How can I colorize my astrophotography?
When you say it only captures black and white images...is that because the sensor is monochrome? Or is it just that things appear black and white when you stack? Some integration tools like DSS will automatically align channels for you, which can make your images look grayscale, when they are really not. If your using a standard DSLR, you images may indeed have color. If you are using a mono CCD, you could always get a filter wheel and use LRGB filters in sequence, and combine the channels in photoshop to produce color images.
Feb
21
comment What is the native color gamut of a modern digital sensor?
Well, Colorimetric Quality Factor or Gamut, whatever you choose to call it, the sensor and readout system of a camera DOES limit the range and discernment of colors within each camera. All cameras are not the same, some have considerably greater color and tonal discernment, others have less. There are many factors that play into this...native silicon response, color filter strength, etc. Render data from many cameras with the same algorithm, and these differences in hardware affect the rendering results.
Feb
21
comment What is the native color gamut of a modern digital sensor?
Gamut is more than coordinates on a two dimensional diagram. Gamut is the full three dimensional extent of color, it's saturation, and it's intensity. You would first need to measure...take photos of a proper test chart with sufficiently saturated and desaturated colors, of sufficiently varying degrees of intensity, and generate a full profile of the camera's gamut. That gamut could then be compared to other gamuts, or even full color spaces such as Lab*, to determine how effective it is at sensing and replicating color.
Feb
20
comment What is the native color gamut of a modern digital sensor?
I wasn't addressing the gamut maps, I was responding to this: "The raw values are not colors per se and the concept of gamut is not working well with raw output of digital cameras." I disagree that the concept of a gamut does not work well with digital cameras. The gamut of a digital camera would be bound by the sensor's color response and noise levels. Each image would then be limited in gamut (color extent) by that response.
Feb
20
comment What is the native color gamut of a modern digital sensor?
Gamut in a digital camera would be the color space supported by the camera sensor's response to light with respect to it's noise levels. Gamut is effectively the SPACE within which colors can be modeled. Newer cameras, particularly those with sensors using more modern manufacturing techniques and with much lower noise (Sony Exmor, Samsung's NX1 sensor) are going to support a much broader range of color than older sensor designs that still suffer from high noise, such as Canon sensors. To really measure a camera's color response, you need to test it with extreme colors.
Feb
19
comment What's the maximum length of USB cable that you can use for tethering?
I think the answer is ok, albeit rather light. I think some explanation about why such a cable is required. I would also note that with active booster cables, a powered hub on the far end (device end) is usually necessary for optimal performance and reliability
Feb
15
awarded  Enlightened
Feb
15
awarded  Nice Answer
Feb
11
awarded  Revival
Feb
6
comment What is the difference between Canvera and Karizma wedding albums?
I agree with Bart, I see the question as asking about relative qualities. Hopefully someone who has used both can offer the necessary comparison. If not, maybe Subhajit could follow dpollitt's suggestion, then return and answer his own question for the future benefit of others. ;)
Jan
31
awarded  Nice Answer
Jan
24
awarded  Nice Answer