Calculadora de Escala de Pixel
Calcule a escala de pixel em segundos de arco por pixel para astrofotografia.
Pixel Scale
0.7735 arcsec/px
Pixel Scale vs Pixel Size
Formula
## Pixel Scale in Astrophotography Pixel scale tells you how much sky each pixel of your camera sensor covers. ### Formula **pixel_scale = 206.265 * p / f** - *p* = pixel size in micrometres - *f* = focal length in mm - 206.265 is the conversion factor from radians to arcseconds (with the mm/um unit adjustment) A good rule of thumb is to match pixel scale to about half the typical seeing (e.g., 1 arcsec/px for 2-arcsecond seeing).
Exemplo Resolvido
3.75 um pixels on a 1000 mm telescope.
- 01scale = 206.265 * 3.75 / 1000
- 02scale = 773.5 / 1000
- 03scale = 0.7735 arcsec/px
Perguntas Frequentes
What is the ideal pixel scale?
About one-third to one-half of the local seeing (FWHM of star images). For 2-arcsecond seeing, aim for 0.7 to 1.0 arcsec/px.
What happens if pixels are too large?
You under-sample the image, losing detail. Stars appear blocky and fine structure is blurred.
What happens if pixels are too small?
You over-sample: the extra resolution is wasted on seeing blur, while read noise and longer exposures increase.