Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

Binoviewers on Dobs


Recommended Posts

Binoviewers eat up tons of focus travel, so almost all newts will not have enough back-focus for a native binoviewer. However, many binoviewers have add-on barlow lenses to gain back focus at the expense of extra magnification, preventing low-power views.

The best newt binoviewers I know of are Denkmeier - the newtonian OCS system for the standard model only magnifies 1.4x and focuses where a normal eyepiece would. I have heard of another make that only magnifies 1.2 or 1.25x but I can't remember which...

Beware of budget binoviewers that have a "1.6x" barlow - it's 1.6x when screwed directly onto the eyepiece, but when screwed onto the binoviewer, how it's intended to be used, the magnification is actually 3x because of the increased distance between the barlow and the eyepiece.

Andrew

Link to comment
Share on other sites

Applemac

Binoviewing with a dob depends on whether you have enough back focus on your scope to allow the Binoviewer to come to focus. This will often mean using a barlow or with Premium Binoviewer a Glass Path Corrector or Optical Corrector

I have to say that I use a Binoviewer on my Mak for planetary and lunar observing but I prefer single eyepiece views in my dobs for DSOs.

That is just my personal view though and I am sure others will offer different perspectives.

The link below shows a Newtonian optimised Binoviewer setup:

Denkmeier - Deep Sky Binoviewer: The New Super Systems

Adrian

Edit: Andrew beat me to it!

The other Binoviewer that Andrew might be referring to is the Baader Mk V, not to be confused with cheaper Baader units. The Mk V is more expensive that the Denkmeier II HTH

Edited by JAO
Link to comment
Share on other sites

At least we agree! :)

1.3x for the mk. II - even better!

I have a pair of revelations, and in my 12" dob the lowest magnification I could get using the "1.6x" corrector is 136x with a 40mm 40° eyepiece. :(

That's why I got a pair of Denkmeiers and they're fantastic :p

Andrew

Link to comment
Share on other sites

Andrew

Snap!:)

I had a pair of Revelations, they were OK but I now have a pair of Denks and they are just superb, a different league. I did look at pair of MK Vs but needed a mortgage for them once you buy the Glass Path Correctors for two scopes!

Adrian

Edited by JAO
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.