Flatfield optics, finally a zoom eyepiece with distortion-free image to the edge area!

Producing a good zoom eyepiece is far more difficult for any vendor than developing a fixed focal length eyepiece. With a zoom eyepiece, different lenses work together, which must be perfectly matched during the zooming process. Many "simple" zoomoculars here have the problem that they do not have sufficient transmission and poorly reproduce in the edge area. With our Flatfield Zoom eyepiece we solved these problems perfectly and converted them into a powerful zoom eyepiece. Due to the special flatfield optics you have a distortion-free and high-contrast image even in the edge area during the entire zooming process. The high-quality broadband multi-compensation of all lenses ensures a correspondingly high transmission in the eyepiece. Blackened lens edges and a specially designed aperture system provide effective reflection protection for high contrast performance. The eyecups can be adjusted individually by unscrewing and adapt to each viewer specially tailored. The eyepiece is also suitable for telescopes with fast optics. Ideal are zoom eyepieces, for example for the journey. They have all the important focal lengths in one eyepiece and do not have to take several fixed focal lengths. Also for landscape observations Zoom eyepieces are perfectly suitable. Like a spotting scope, you can zoom in on objects without constantly having to change eyepieces.

Technical data of the eyepiece series EF Zoom:

    Extra Flatfield Zoom Eyepiece
    Plug diameter: 31.75mm (1.25")
    Focal length: 7.5 to 22.5mm
    Eye distance: 19.5mm
    66-42° field of view, comfortable viewing, high contrast, distortion-free image
    Lenses with 8 elements of 5 groups each
    Highest quality broadband multi-compensation of the lenses
    Parafocal
    Suitable for eyeglass wearers, adjustable eyecup (Twist Up Style)
    Blackened lens edges, elaborate glare design against stray light
    Handle on eyepiece outside
    Incl. Storage box and microfibre cloth

Information:

For observation with a telescope different eyepieces are required. For lunar, deep sky / galaxy observations a rather small magnification is needed. For planetary observations, however, a very high magnification of:

- 30-50x magnification as an overview eyepiece and for lunar observations,
- 70-100 times for lunar, galaxy and fog observations,
- 140-200 times for planetary observations.

Our recommendation: Never exceed the telescope magnification by more than 2 times the lens diameter.

An example: If a telescope has a 90mm lens, you should not exceed a 180x magnification.

The magnification is calculated as follows: Telescope focal length in mm / eyepiece in mm
An example: Telescope with 1000mm focal length / eyepiece with 10mm = 100x magnification in the telescope