Field Flattener f/5 to f/7 92-series-eyepieces EMD-coated optics

EMD-coated optics

twist-up eyecups

and smart functionality that enhances every observing session

(Notified Body No

Field Flattener f/5 to f/7 92-series-eyepieces EMD-coated opticsWhen doing astrophotography with refractor type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.