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Equipment Discussions >> Binoviewers

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HowardK
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Reged: 10/20/10

TEC 140 and MK V bino.....
      #6135284 - 10/13/13 03:50 PM

I read on the Astro Physics site this.....concerning fast refractors, mk v binos and a Baader glasspath compensator.....

Removable 1.25x Compensating Optical Element - This optical element eliminates the slight color error and spherical aberration that a prism beam splitter naturally introduces into the light path of all binocular viewers. It allows you to enjoy wide-field, low-power views of deep-sky objects, as well as high powers. This element (also known as a Glasspath Compensator) was designed by Roland Christen of Astro-Physics and is essential for telescopes with fast focal ratios. One of these optics should always be part of the optical path of telescopes with fast focal ratiosunless a BARADV or BPFFC is used.....

My TEC is f/7 and i enjoy her with a Baader prism diagonal and MK V binos.

Does the forum think i really need to use a 1.25x GPC with this setup?


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crazyqban
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Reged: 12/16/08

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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6135289 - 10/13/13 03:53 PM

I have used my Mark Vs with and without the 1.25 GPC as suggested and I really cannot see any difference. I usually keep it in there and take it out if I need a little extra FOV.

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HowardK
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Re: TEC 140 and MK V bino..... new [Re: crazyqban]
      #6135299 - 10/13/13 03:58 PM

Ty Sergio

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Eddgie
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6136524 - 10/14/13 09:47 AM

I think that in a Televue 101 or similar fast scopes, the GPC might be beneficial. At f/7 or f/8, I think it is less cricitical.

For really fast scopes though I think that it might be best to use the Max mirror and the GPC (Televue 101 maybe).

If you can reach focus without it though I think you will prefer the ability to get lower powers and wider fields.

And for planets, you can always put in the GPC. This is the only time it would likely make a difference, though I am not convinced that it would.

And if you are using them and have not noticed anything wrong then that by itself should be all you need, yes???

Edited by Eddgie (10/14/13 11:12 AM)


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tomcody
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6136674 - 10/14/13 11:09 AM

Astro Physics recommends using a GPC or barlow, to correct aberrations in the prisms and I have noticed some off axis color (for want of a better word ) flashes if my eyes are not exactly centered when not using one and I remember reading that Dennis0007 (in another thread) also reported the same need to keep his eyes centered when not using GPC's. Now if the slight color flashes do not bother you? then of course you do not need the GPC's.
Rex


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Astrojensen
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Loc: Bornholm, Denmark
Re: TEC 140 and MK V bino..... new [Re: tomcody]
      #6138310 - 10/15/13 03:36 AM

For critical lunar/planetary/solar observing, using a GPC can be beneficial. For wide-field deep-sky and low magnification observing, it's not important and can safely be ignored.


Clear skies!
Thomas, Denmark


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: Astrojensen]
      #6138493 - 10/15/13 08:17 AM

Ty

Thomas


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6140216 - 10/16/13 02:02 AM

This from Yuri at TEC as stated from BAADER....

Hi Howard, here is the answer from Baader planetarium:
"The Mark V Bino has about 100mm of glasspath and every customer using our bino in conjunction with a refractive optics faster than f/8 ABSOLUTELY needs that 1.25x Glasspath-compensator. This is the correct answer".

Regards, Yuri


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Astrojensen
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6140252 - 10/16/13 03:48 AM

For critical observing, yes. For wide-field observing, where you're far below the diffraction limit, not at all. I do HIGHLY recommend using them or a barlow, when doing lunar/planetary observing, though.

Just stating the obvious.


Clear skies!
Thomas, Denmark


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: Astrojensen]
      #6140403 - 10/16/13 08:16 AM

I'm going to keep my 1.25x GPC in my MK V binos.

Thanks
Thomas


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Astrojensen
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6140409 - 10/16/13 08:23 AM

I often observe without a GPC and can't notice a difference at low magnification whatsoever, apart from the fact that I'm getting 20% wider field. This is also true on my f/6 and f/8 refractors.


Clear skies!
Thomas, Denmark


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: Astrojensen]
      #6141049 - 10/16/13 02:36 PM


I have now installed the Baader 1.25 GPC on my MK V Baader binoviewers and this setup has completely removed the colour fringing i was seeing on the moon thru my TEC 140 with the binoviewers and no GPC.....at higher magnifications

Am very happy


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DaveJ
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6141086 - 10/16/13 02:55 PM

Quote:


I have now installed the Baader 1.25 GPC on my MK V Baader binoviewers and this setup has completely removed the colour fringing i was seeing on the moon thru my TEC 140 with the binoviewers and no GPC.....at higher magnifications

Am very happy




I've experienced the exact same thing with my TEC 140 and MarkV binoviewers. I still use the MarkV without the GPC for low-power Milkyway sweeps with the 24mm Panoptics and that's a great view, too! Still, absolutely color-free high-power views of the Moon and planets with the 1.25 GPC is to die for. It's great to be able to have both with such a simple few-second conversion.


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: DaveJ]
      #6141218 - 10/16/13 04:23 PM

Yes Dave

U r right


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6141225 - 10/16/13 04:25 PM

Although removing the GPC means racking the focuser in about 15mm ...which buggers up my perfect balance on my az eq6 mount!

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HowardK
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6141228 - 10/16/13 04:26 PM

I use a pair of 3-6mm Nagler zooms

How about u?


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DaveJ
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Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6141234 - 10/16/13 04:30 PM

Quote:

I use a pair of 3-6mm Nagler zooms.
How about u?




I have pairs of every single 1.25" eyepiece in my sig, and a whole bunch more that aren't listed. However, and this is sad, I don't have a pair of the 3-6mm Nagler zooms. I have the one and need to get another one to match!


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Astrojensen
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Loc: Bornholm, Denmark
Re: TEC 140 and MK V bino..... new [Re: HowardK]
      #6141235 - 10/16/13 04:30 PM

I am currently comparing my 2.6x GPC and a 2" 2x GSO barlow, which gives very close to the same magnification, when the lens cell is attached to the 2" nosepiece on the Maxbright. So far, it seems the GSO barlow is actually brighter, sharper and has less color fringing than the 2.6x GPC, but I've only compared them twice so far, and the seeing wasn't too cooperative in either case. I was using my Telemator and 6" f/8 achromat, stopped to 112mm f/10.7, respectively, so it might be that the GSO changes the color correction better than the GPC does. I will need to try them on the newtonian. It's been a long time since I observed the Moon with the 12" dob, but from memory, the 2.6x GPC was color free in that scope.


Clear skies!
Thomas, Denmark


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Astrojensen
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Loc: Bornholm, Denmark
Re: TEC 140 and MK V bino..... new [Re: Astrojensen]
      #6141238 - 10/16/13 04:32 PM

Also need to do some color comparisons with stacked GPCs.


Clear skies!
Thomas, Denmark


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HowardK
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Re: TEC 140 and MK V bino..... new [Re: DaveJ]
      #6141252 - 10/16/13 04:39 PM

Quote:

Quote:

I use a pair of 3-6mm Nagler zooms.
How about u?




I have pairs of every single 1.25" eyepiece in my sig, and a whole bunch more that aren't listed. However, and this is sad, I don't have a pair of the 3-6mm Nagler zooms. I have the one and need to get another one to match!





Do it man


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