I enjoy planetary, lunar and double stars mostly but do view pretty much any object within reach of my telescopes.
I do like viewing
You should try a ball lens, on axis about 5-15°
I had a set of Nikon NAV-HW (102°) on loan for a while, the views were spectacular but I just did not enjoy that I had to keep turning my head to see the entire
Do you means the Herschel eyepiece? Not the monocentric.....Lady Fraktor wrote: ↑Mon May 24, 2021 4:32 pmYou should try a ball lens, on axis about 5-15°AFOV on axis, everything outside that is blurred but you will have the cleanest most contrasty view in center. Quite amazing views.
ER is usually 5mm and less though.
No, thank you. For me blurry edges are worse than narrow field.Lady Fraktor wrote: ↑Mon May 24, 2021 4:32 pmYou should try a ball lens, on axis about 5-15°AFOV on axis, everything outside that is blurred but you will have the cleanest most contrasty view in center. Quite amazing views.
ER is usually 5mm and less though.
These would be perfect as you can have both!
I'm curious, now....Lady Fraktor wrote: ↑Mon May 24, 2021 4:52 pm I have 1 Herschel style but a few others that are ball lenses.
There are a few places still to buy them I think and there are many places to buy the components to make them yourself.
I found the lenses on the Edmund Optics site. https://www.edmundoptics.com/f/used-ili ... ses/14111/Lady Fraktor wrote: ↑Mon May 24, 2021 5:18 pm I just checked and Sieberts still sells his Planeshere eyepieces and Edmunds still sells components to make them yourself.
https://www.siebertoptics.com/Planesphere.html
Yes on interpretation. For me Herschellian is a sphere with a spherical cap removed, the thickness of the cap can vary from zero to the radius of the sphere.Lady Fraktor wrote: ↑Mon May 24, 2021 6:40 pm Fused Silica and BK7 are the most common though Steve Coutre and Sieberts made sapphire and ruby ones for a while.
I suppose it is just interpretation, a Herschellian to me is a ball with a flat not completely spherical.
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