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Equipment Discussions >> Binoviewers

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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Anybody using W.O. Binos and a Mewlon 180?
      #5672496 - 02/10/13 02:43 PM

I'm taking posession of a Mewlon 180 in a week or so and am thinking about getting a pair of Williams Optics binos. The Mewlon has a feathertouch focuser on it.
Anybody gotten this combo to work or have any suggestions as to how to make it work?
Link to focuser: http://starlightinstruments.com/store/index.php?route=product/product&pro...
Binos: http://agenaastro.com/william-optics-1-25-binoviewer-package.html
Thanks in advance

Jeff


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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Jeff Smith]
      #5680766 - 02/15/13 07:18 AM

Any suggestions?

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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51°N 4°E
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Jeff Smith]
      #5680837 - 02/15/13 08:31 AM

Just replied to you on the Yahoo group!

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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5681254 - 02/15/13 11:46 AM

Thanks

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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51°N 4°E
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Jeff Smith]
      #5681379 - 02/15/13 12:41 PM

Having now seen your focusser link, I'd say that'll be OK Jeff. It's really short, no longer than many other visual backs.

The Baader Maxbright binoviewer is $279 that's not all that much more than the WO and it has a 23 mm clear aperture. Add a T2 diagonal for $129 and you're in business. A pair of 25mm Plössls would give you 86x (not considering the longer FL due to the binoviewer's longer optical length) and 0.6° TFOV - that'll be fun on bright DSO. I have a pair of 25mm Circle-T 55° Erfles on the way to me to get that last bit of FOV the Maxbrights allow (these have 22.3mm fieldstop compared to 21.2 for the TV Plössl - not all that much difference, I know, but way bigger than my current 25mm orthos at 17.6 mm FS and 41° AFOV).


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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5682961 - 02/16/13 08:38 AM

Thanks Mark. I actually have a new Williams Optics 2" diagonal ( http://agenaastro.com/william-optics-2-quartz-dielectric-coating-sct-diagonal... ) that should work great. I guess I could get the bino and then see if I can make it work.

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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51°N 4°E
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Jeff Smith]
      #5683043 - 02/16/13 09:31 AM

That's what I feared you'd say. This 2" mirror diagonal eats about 100-110 mm backfocus with the eyepiece clamp included, compared to a T2 prism diagonal that you can use without eyepiece clamp (with the Maxbrights) and requires only about 40 mm backfocus. That's a difference of 60-70 mm!

You will most definitely need to use a barlow lens with your binoviewer, and you lose the "wide" field capability.


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Jeff Smith
professor emeritus


Reged: 04/06/10

Loc: Chicago
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5683079 - 02/16/13 09:48 AM

Ugggggg....bad news

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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51°N 4°E
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Jeff Smith]
      #5683649 - 02/16/13 02:35 PM

Well it's just my opinion, it's not that I've actually tried this combination. But the Mewlon 180 review here on CN indicates the same.

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johnnyha
Postmaster
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5683921 - 02/16/13 05:28 PM

Quote:

Ugggggg....bad news




No problem Jeff. I'd suggest getting the Maxbright with a 1.25" diagonal, either the T2 prism or mirror. Install a 2" nosepiece on the 1.25" diagonal, and keep the diagonal attached to the binoviewer.

You can use your 2" diagonal for your eyepieces.


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Mark9473
Postmaster
*****

Reged: 07/21/05

Loc: 51°N 4°E
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5685409 - 02/17/13 03:32 PM

Quote:

This 2" mirror diagonal eats about 100-110 mm backfocus with the eyepiece clamp included, compared to a T2 prism diagonal that you can use without eyepiece clamp (with the Maxbrights) and requires only about 40 mm backfocus. That's a difference of 60-70 mm!

You will most definitely need to use a barlow lens with your binoviewer, and you lose the "wide" field capability.




On my Mewlon 210, I tried tonight to add a 2" long extension tube in front of the T2 diagonal with the Maxbrights attached, without barlow lens, and could not reach focus. A shorter visual back (I use a 2" Baader clicklock clamp) would have helped, but I don't know if there's one that makes enough difference.


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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: Mark9473]
      #5695832 - 02/22/13 11:02 PM

Hi Jeff, I dont have a M180 , but I do have a M210 and can use my WO bino viewers if I substitute the 2 inch diagonal for a WO 1 1/4 inch diagonal , that way I can acheave focus without the 1.6x barlow .
The views of the moon and jupiter at the moment are just so awsome !! with this combo , it blows me away every time I use it .
I have 2 off , TV 40mm plossls that work very well in this set up .
Brian.


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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Anybody using W.O. Binos and a Mewlon 180? new [Re: beanerds]
      #5695844 - 02/22/13 11:07 PM Attachment (13 downloads)

Here they are .
Brian.


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