Shutter Time Calculator

Shutter Time Calculator calculator can be used to calculate the required shutter speed for astrophotography based on the focal length, desired magnification, and the size of the object being photographed.

Input Parameters

Calculation Results

Calculation Formula

Shutter Time (seconds) = (Focal Length / Magnification) / Object Size

Where:
Focal Length: The focal length of the telescope in millimeters.
Magnification: The magnification used for the observation.
Object Size: The angular size of the object in arcseconds.

Result

Shutter Time: 0.00 seconds

Shutter Time Calculator Calculator Usage Guide

Learn how to use the Shutter Time Calculator calculator and its working principles

How to Use the Shutter Time Calculator

  1. Enter the focal length of your telescope in millimeters.
  2. Enter the magnification you are using for the observation.
  3. Enter the angular size of the object you are photographing in arcseconds.
  4. Click the "Calculate" button to compute the required shutter time.
  5. The result will be displayed in seconds.

Working Principle

The shutter time is calculated using the formula:

Shutter Time (seconds) = (Focal Length / Magnification) / Object Size

This formula ensures that the image is properly exposed based on the magnification and the size of the object being photographed.

Example

If you are using a telescope with a focal length of 2000 mm, a magnification of 200x, and the object you are photographing has an angular size of 2 arcseconds, the required shutter time would be:

Shutter Time = (2000 mm / 200x) / 2 arcseconds = 5 seconds