Field Flattener f/5 to f/7 92-series-eyepieces or plants while documenting their

or plants while documenting their activity with a built-in time-lapse camera

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

Designed for both night sky enthusiasts and nature observers

the ED80 is perfect for spontaneous stargazing or as a secondary scope for advanced astrophotography setups

25" H-Beta Range from 478nm to 496nm with peak at 489nm

Field Flattener f/5 to f/7 92-series-eyepieces or plants while documenting theirWhen 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.