Bino viewers!

[paul mc c]

Can bino viewers be used with a Newt or are they best suited for Refractors.

Paul

[kniclander]

I would say they are best suited for cassegrains where there is more focus travel. newts and refractors tend to have problems with lack of in focus which can be fixed with barlows but then you end up with very very high magnification.

[paul mc c]

I have never seen them with anything other than a Frac or an SCT that is why i was asking as i have been thinking of buying one.

[CGolder]

The problem with using them wirh cassagrains is that you end up with huge focal lengths that only work on planets

Yoy could cut down a frac to give you more infocus :-)

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[CGolder]

Or push he mirror up in a newt, i cant see the position being great on a dob

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[kniclander]

The problem with using them wirh cassagrains is that you end up with huge focal lengths that only work on planets

Yoy could cut down a frac to give you more infocus :-)

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where do the "huge" focal lengths come from? in reality because of the loss of light people only tend to use them on moon and planets anyway. btw they are awesome for moon and planets.

[CGolder]

I agree they are great for planets but it does limit their usefulness

I was trying to work out the math back when i had my set but moving the primary to the right position for the increase in light path seems to increase the focal length by more than that of the light path added by the bino viewer,

The cheaper binoviewers wont take a max fov 1.25" eyepiece properly due to the amount of light it can pass through.

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[paul mc c]

It seems very complicated,i think i will stick to the one eyed viewing with my dob.

[DOBBY]

the skywatcher ones come with a 1.6 barlow...they work very well in a 200pds newt & are fantastic in a 400p dob... downside is buying 2 eyepieces per mag

[inspectapart]

I have a WO pair of bVs and tried them in my 102 refractor. They worked only if I used the 1.6 barlow that came with them. The problem is "in focus travel" You need this extra in focus to bring them to focus. BUT.......... once they work, they really do improve the view and are brilliant for planets and the moon. It feels like you get a lot of extra detail and that is really nice on the planets.. Somehow it`s as if you are stepping up to a 5" scope from a 4".

[MjrTom]

Interesting you should say that I have been thinking of getting a Binoviewer for my Vixen SP102M

[Adrian]

I was trying to work out the math back when i had my set but moving the primary to the right position for the increase in light path seems to increase the focal length by more than that of the light path added by the bino viewer,

You reminded me I hadn't posted my data about this - see here http://stargazerslounge.com/discussions-scopes-whole-setups/162625-sct-focussing-changing-focal-length-some-data.html

focal length seems to increase by somewhere between 3 -4 times the light path increase.

[CGolder]

Thanks for that adrian, was a very interesting read

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[kniclander]

Interesting stuff about the binoviewer effect on f/l guys. Thanks for posting.