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Equipment Discussions >> Eyepieces

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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: 24mm Brandon: I think I just figured it out. new [Re: LDb]
      #5510117 - 11/08/12 03:10 PM

So somebody please explain to me what exactly is a "matched" barlow.

What does it "match"?

Jeff


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Rick Woods
Postmaster
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Reged: 01/27/05

Loc: Inner Solar System
Re: 24mm Brandon: I think I just figured it out. new [Re: Jeff B]
      #5510434 - 11/08/12 07:36 PM

According to the post, it matches the 24mm Brandon. I interpret that as meaning the combination is greater than the sum of the parts. Or something like that.
The Dakin, with its 2.4x magnification, is intended to complement the Brandons by making a whole new set of eyepieces with no duplications.

I've got a Dakin, but I confess I haven't used it hardly at all (you don't need a barlow in a big SCT), so I can't say from personal experience.


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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Nyctophobia, Maryland, USA
Re: 24mm Brandon: I think I just figured it out. new [Re: Rick Woods]
      #5510518 - 11/08/12 08:46 PM

I hardly ever use a Barlow any more; virtually never for deep sky, hardly ever for planets/Moon. But I do screw on a Barlow lens cell in order to compensate for not enough in-focus when I use a binoviewer or filter wheel on my Newts. Other than that, I'd rather utilize individual eyepieces. I've recently sold a couple of my Barlows. Just wasn't using them.

Mike


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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: 24mm Brandon: I think I just figured it out. new [Re: Rick Woods]
      #5510563 - 11/08/12 09:11 PM

Quote:

According to the post, it matches the 24mm Brandon. I interpret that as meaning the combination is greater than the sum of the parts. Or something like that.
The Dakin, with its 2.4x magnification, is intended to complement the Brandons by making a whole new set of eyepieces with no duplications.

I've got a Dakin, but I confess I haven't used it hardly at all (you don't need a barlow in a big SCT), so I can't say from personal experience.




Ok, so what optical abberations does it correct, if any?


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Rick Woods
Postmaster
*****

Reged: 01/27/05

Loc: Inner Solar System
Re: 24mm Brandon: I think I just figured it out. new [Re: Jeff B]
      #5511006 - 11/09/12 03:36 AM

That, I don't know.

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jrbarnett
Eyepiece Hooligan
*****

Reged: 02/28/06

Loc: Petaluma, CA
Re: 24mm Brandon: I think I just figured it out. new [Re: Jeff B]
      #5511485 - 11/09/12 11:46 AM

The introduction of a Barlow or Smythe Lens (either one) corrects for off-axis astigmatism in faster scopes. In fact, that's one of the main reasons "modern" eyepieces like Naglers handle a fast light cone better than "traditional" ones; the design incorporates a Barlow-like element.

Regards,

Jim


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