This makes the 31mm Nagler look tiny!

[MortonH]

Zeiss 100mm 80° eyepiece


http://www.astromart.com/classifieds/details.asp?classified_id=885617

[DavidU]

:eyepop: counter weight time.
Interesting bit of kit there.

[Wavytone]

Not for small amateurs scopes. That's suitable for say a 90cm f/5 or an observatory-sized cassegrain, I recall something similar on the Reynolds at Mt Stromlo (that was a 30" f/15).

Having tried a 90cm f/5 it wouldn't even notice an eyepiece like this one.

[winensky]

Sad that so much history was destroyed but this is the housing of that telescope after that fire.