Eyepiece 1.25" Wide angle? (1 Viewer)

[DRodrigues]

I hate the 100 degree Ethos.

Can you elaborate it?
The 110º Ethos and clones are more difficult to see all AFOV since the eye-relief is the same - shorter in some clones.
I love my Ethos 17 with my astro-combo test of >80º "zooms" since the Nikon FSA-L2 induce an increase of eye-relief and I can see almost all FOV with eye-glasses and produce a flat-field FOV!
Don't know what 82º and 90º eps you prefer but probably have more eye-relief than the Ethos...
At test of 5 mm eps is possible to have an idea of the influence of the eye-relief on the AFOV seen by eye-glass users - notice the AFOV photo of the Nikon HW 12.5 with 2 barlow cells that induce an increase on eye-relief...

 

[DRodrigues]

Hi David,

I assume that most 100 deg EPs are used in your TMB as they're 2"? Or did you find a way to make them work ok on spotters with your adaptions?

Joachim, who got a cheap ES 100 deg 9mm and the space window effect is nice... but truth be told the useful field is not a lot larger than a Nagler unless doing funny eye movements...

Hi Joachim,

There are 100º AFOV eps on 1.25" format but I also adapted some 2" eps that can be transformed on 1.25" - see the ES92 on the link of the last post.
The ES100_9 has more reduced eye-relief than the Ethos and some other clones, so probably is more difficult to see all field.
I can see the difference on the AFOV from the 100º of the Ethos 17 to the 102º of the Nikon HW 12.5...
The "beauty" of the >82º eps is the window effect and that you don't need to move the scope to see more field - depending on the eps and the observer, some observers might need to move their eyes to see all field that still is an advantage since you don't have to move the scopes!
Just remembered that since "ages" I wanted to test the Nikon HW12.5 with the Baader zoom 2.25x barlow and compare it to the ES92_12 with the same barlow - since Swaro released the 1.7x extender for the X series, I don't use usually the Optolyth 100...

 

[Binastro]

I can't remember the Ethos focal length, but I'll check.

I know I just hated it, because I had to move my eye around too much.

I have several Nagler 82 degrees and also several Meade Super Wide? Either 82 or 84 degrees.
These are very nice, although an early short focal length Nagler had too little eye relief.

The 92 degree eyepiece is a large eyepiece with a fancy adapter attached, but taking the adapter off it is very nice.
Again I'll have to check the focal length.
It has no name and was a very low price special one off.

I don't wear glasses with telescopes or binoculars normally.

I like binoculars to have a minimum 70 degree simple field or more, but few have this.

The 12x50 Ultravid is 5.75 degrees.
The 8.5x44 Swifts 8.26 or 8.35 degrees.
The 7x35 Minolta Standard MK 11.05 degrees.
Komz 6x24 and Amplivid 6x24 12.2 degrees.
5x25 VisionKing 15 degrees.
16x56 Hensold is also wide.
Many 10x50s 7.5 to 7.9 degrees.
Several 8x40s 9.5 degrees.
18x50 Canon IS 3.85 degrees.
Celestron 20x80 Japan 1975 3.5 degrees.
Yukon Futurus? 12x50 5.7 degrees.

But nowadays I make do with the 8x32 Leica BA 7.8 degrees I think as my desk top binocular.

The 7x32 Bresser Superwide is over 13 degrees, but the image is terrible.
The 10x50 over 9 degrees.

Regards,
B.

P.S.
One of the eyepieces is marked Super Wide Angle = 92 degrees.
NP + to - infinity.
It is in a nice helical focus mount with one inch of travel.
It has a 1.25 inch adapter.
Also maybe a T2 screw mount with locking collar.
There are many multicoated surfaces in various colours.
A rubber eyecup and a front cover for the 1.25 inch adapter.
It may be from some kind of optical instrument, but I don't know its origin.

 

[FredinZona]

Anyone know which adaptor would work on the Vortex Gen1 or Gen2 85mm spotting scope?
or
The Athlon Chronos 86mm spotting scope?

thanks