1. What is Pixel Scale?

Pixel scale represents the angular size of each pixel in an imaging system, typically measured in arcseconds per pixel. It's a crucial parameter in astronomy and photography that determines the field of view and resolution of an imaging system.

2. How Does the Calculator Work?

The calculator uses the pixel scale formula:

Where:

• Pixel Size — Physical size of camera sensor pixels (μm)
• Focal Length — Focal length of the optical system (mm)
• 206265 — Conversion factor (arcseconds per radian)

Explanation: The formula calculates how much sky or scene is covered by each pixel in your imaging system, which is essential for determining resolution and field of view.

3. Importance of Pixel Scale Calculation

Details: Proper pixel scale calculation is essential for optimizing imaging systems, matching telescope/camera combinations, achieving optimal sampling for astrophotography, and ensuring appropriate resolution for scientific measurements.

4. Using the Calculator

Tips: Enter the pixel size of your camera sensor in micrometers (μm) and the focal length of your optical system in millimeters (mm). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the ideal pixel scale for astrophotography?
A: For deep-sky astrophotography, a pixel scale of 1-3 arcseconds per pixel is generally recommended, while planetary imaging benefits from smaller scales (0.1-0.5 arcseconds per pixel).

Q2: How does pixel scale affect image quality?
A: Pixel scale determines the resolution and field of view. Smaller pixel scales provide higher resolution but narrower field of view, while larger scales offer wider fields with lower resolution.

Q3: What is the 206265 constant in the formula?
A: This is the number of arcseconds in one radian (3600 arcseconds/degree × 180/π ≈ 206265), used to convert from linear measurement to angular measurement.

Q4: Can I use this calculator for terrestrial photography?
A: Yes, though the angular measurement (arcseconds) is more relevant for astronomical applications. For terrestrial use, you might want to calculate angular field of view instead.

Q5: How does binning affect pixel scale?
A: Binning combines adjacent pixels, effectively increasing the pixel size and thus increasing the pixel scale (larger arcseconds per pixel).