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Both calculators run independently — change the inputs on either side to compare results.

Diffraction Limit Calculator

Calculate the smallest resolvable spot or feature that an optical system can distinguish, based on wavelength and aperture. Use it when designing cameras, telescopes, or microscopes where resolution is critical.

Wavelength (nm)

Aperture Diameter (mm)

Focal Length (mm)

Diffraction Criterion

Fill in the required fields to see your result.

Optics

Numerical Aperture Calculator

Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.

Core Refractive Index

Cladding Refractive Index

Fill in the required fields to see your result.

Key differences

	Diffraction Limit Calculator	Numerical Aperture Calculator
Category	Optics	Optics
Inputs required	4	2
Result	Angular Resolution (μrad)	Numerical Aperture
What it does	Calculate the smallest resolvable spot or feature that an optical system can distinguish, based on wavelength and aperture. Use it when designing cameras, telescopes, or microscopes where resolution is critical.	Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.