![]() Length (distance between the focus and the objective) The other way uses a very long objective focal One way uses multiple compensating lenses toĬhromatic aberration. Pretty rainbows, but can it ruin an image!Ĭhromatic aberration. Light (bluer colors) as it passes through the lens. The longer wavelength light (redder colors) is bent less than the shorter Produces a rainbow of colors around the image. All refractors suffer from an effect called chromaticĪberration (``color deviation or distortion'') that. ![]() Telescope have blocked the construction of very large refractors for use in Though excellent refractors are still made, the disadvantages of the Steadier and sharper than those from a reflector telescope of the same
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