Field Flattener f/5 to f/7 92-series-eyepieces Designed for both night sky

Designed for both night sky enthusiasts and nature observers

(Notified Body No

twist-up eyecups

EMD-coated optics

many emission nebulae only come to light when this filter is used and are shown in full extent on the astrophotos

Field Flattener f/5 to f/7 92-series-eyepieces Designed for both night skyWhen 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.