ImageReasonAstrophotography and Night Capture
Does my declared target fit this sensor and lens?
Enter your sensor, focal length, and a target's angular width/height to see whether it fits geometrically with your framing margin, camera geometry only, not visibility.
Answer
Calculate a result to see the limiting dimension.
Want to learn more? Framing, Perspective, Equivalence, and Image Circles
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Calculate to see the sensor field and target angular rectangle.
| Scenario | HFOV | VFOV |
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Calculate a result to generate a copyable plan.
Geometry begins the plan, it does not finish it
Astro framing begins with sensor geometry, but it does not end there. A field-of-view calculation can compare your lens and sensor with a target angular box you enter. It cannot know where the object will be, how it will rotate in your frame, whether it is visible, or whether tracking and sky conditions support the capture.
A 200mm lens on a 36×24mm sensor covers about 10.29 by 6.87 degrees. With a 10 percent margin, a declared 3 by 2 degree target fits geometrically. Before a shoot, verify the target's position and timing independently, test the star field, and leave additional framing room for orientation or a possible mosaic.
This result models the values you entered. It cannot see the scene, verify focus or movement, predict camera-specific processing, or guarantee the final photograph. Use it as a stated starting point, then check the important subject area in a test frame or proof.
Make one controlled test with the important variable held constant. Inspect the subject detail, motion, highlights, and intended output, then adjust the setting that protects the priority you named.
FAQ
- Can this tell me where a nebula will be tonight?
- No. It only calculates camera field of view from the dimensions you enter. Use an appropriate astronomical planning source for position and visibility.
- Is this a guarantee?
- No. The result is bounded by the inputs and assumptions shown on the page. It is designed to support a better next decision, not replace a test, measurement, proof, or professional judgement where one is needed.