Thanks for your reply, Gerd.
In the Houdini eyepieces there is no separate coma correcting lens or lens group; all the glass elements in the eyepiece together perform the coma correction. In other words, you cannot remove one or two lenses and transform the coma-correcting eyepiece into an ordinary eyepiece.
You can see some eyepiece designs on this page:
Selection of Coma Correcting Eyepiece Designs (none of these are taken in production, they just serve as example).
Referring to your reply to Rolf, in my opinion the Houdini eyepieces can challenge all the other eyepieces including Ethos, XWA and Pentax XW.
To limit weight, cost, and size, and to be able to offer long eye relief, I chose to go with 86° instead of 100°. I prefer having better comfort at the eyepiece instead of the extra 10° of peripheral view. A field of 86 degrees is still ultra large, and it's very easy to view.
The Houdini's for sure are not perfect eyepieces, but they're the best compromise I could make in terms of field of view, sharpness, eye relief, weight and size, and cost. The first reviews have been very good, I've collected some of them here:
What observers say about the Houdini Eyepieces | Houdini Coma-Correcting Eyepieces
Since December the Houdini 20 has replaced my Ethos 21 + Paracorr in all my observations with the big 1100 mm f/3.6 telescope, and the Houdini 12 prototype now replaces the Ethos 13 + Paracorr. Since January my Ethos 21 has not left its box. And later this year the Houdini 7 will replace the Ethos 8 + Paracorr.
Again, this is not a perfect eyepiece, but it's nice that visual observers now have an additional option.
www.houdinitelescopes.com
ebenso wie z.B. an Mak Newtons mit f6 und schneller. Für einen leichten Dobson finde ich die Okulare gar nicht uninteressant nur universell sind sie nicht.
.ico)
