| The 'Barlow lens', a modification of this telescope lens, is a negative achromatic combination of flint glass and crown glass. |
| It consists of two identical achromatic lenses, placed with their most curved surfaces facing each other. |
| To correct for spherical aberration in lenses, achromatic lenses can be used. |
| The objectives are adopted by poly-membrane achromatic lenses and collocated with widefield eyepieces. |
| The superior achromatic lenses will show you color and details you have never seen before in both your antique and self-made stereo views. |
| Large aperture constraints require an achromatic lens for situations needing superior image quality and color correction. |
