Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Anybody tried these in WO binoviewers?

  • Please log in to reply
4 replies to this topic

#1 Miranda2525

Miranda2525

    Surveyor 1

  • *****
  • topic starter
  • Posts: 1563
  • Joined: 12 Jul 2016

Posted 15 May 2019 - 06:27 PM

https://agenaastro.c...d-eyepiece.html

 

Anybody tried these in the William Optics binoviewers? Do they vignette a lot? or is vignetting not an issue? I have a pair of 20mm 66 deg eyepieces for binoviewing, and I am looking for a lower power pair, but with a wider AFOV than 52 degrees.

 

The 20mm 66 deg eyepieces have a 23.0mm field stop diameter and vignetting is so minimal that it is not an issue. The 27mm pair above in the link have a 24.4mm field stop diameter.

 

Thoughts?


Edited by Miranda2525, 15 May 2019 - 06:34 PM.


#2 ngc7319_20

ngc7319_20

    Viking 1

  • *****
  • Posts: 624
  • Joined: 25 Oct 2015
  • Loc: MD

Posted 15 May 2019 - 07:36 PM

I'm using them in Zeiss and Denkmeier binos.  I like them.  Good eye relief for wearing glasses.  No obvious vignetting, though it is there -- depending on the configuration and OCS set up and say an F/4 scope, there's a gradual roll off to maybe 40% or 50% light loss at the edges.  But thats going to be typical when the field stop and bino clear aperture are similar.  In fast scopes stars at the field edges will be soft in these.  TeleVue 24mm Panoptics are much sharper at the field edges, but then the eye relief stinks with glasses on.  Various trade-offs.



#3 Miranda2525

Miranda2525

    Surveyor 1

  • *****
  • topic starter
  • Posts: 1563
  • Joined: 12 Jul 2016

Posted 16 May 2019 - 01:01 AM

I'm using them in Zeiss and Denkmeier binos.  I like them.  Good eye relief for wearing glasses.  No obvious vignetting, though it is there -- depending on the configuration and OCS set up and say an F/4 scope, there's a gradual roll off to maybe 40% or 50% light loss at the edges.  But thats going to be typical when the field stop and bino clear aperture are similar.  In fast scopes stars at the field edges will be soft in these.  TeleVue 24mm Panoptics are much sharper at the field edges, but then the eye relief stinks with glasses on.  Various trade-offs.

Different animal altogether because the WO BV'ers have a clear aperture of only 20 or 21mm.


Edited by Miranda2525, 16 May 2019 - 01:01 AM.


#4 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16144
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 16 May 2019 - 05:27 PM

IME the breaking point of Vignetting is only a mm or so over the limit.  The question here is what is that limit?

I personally wouldn't chance it as you'll be 3 - 4mm over the CA, but that's not to say I won't work.



#5 ngc7319_20

ngc7319_20

    Viking 1

  • *****
  • Posts: 624
  • Joined: 25 Oct 2015
  • Loc: MD

Posted 16 May 2019 - 08:59 PM

Vignetting will depend on the F/ ratio of the scope.  For faster scopes there will still be light reaching the eyepiece field stop. 

 

Also, does it mater all that much if the eyepiece field stop is dark?  I guess it is non-asthetic. But the rest of the field is fine.


  • Miranda2525 and Rustler46 like this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics