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Date: 16 Jun 2007 16:32:16
From:
Subject: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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Hi everyone,
I am looking for an adaptor to be able to attach a diagonal (or just
an eyepiece) to a Canon EF lens, for visual use. Is there such an
animal???
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Date: 17 Jun 2007 15:46:28
From: laura halliday
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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On Jun 16, 9:32 am, macnoo...@gmail.com wrote:
> Hi everyone,
>
> I am looking for an adaptor to be able to attach a diagonal (or just
> an eyepiece) to a Canon EF lens, for visual use. Is there such an
> animal???
Why not make one?
It's going to be pretty stubby - camera lenses have, by
telescope standards, very little back focus. They don't
need much, since the focal plane is set by where the
film/CCD is in the camera. I just tried holding eyepieces
up to a couple of lenses, and while they reach infinity
focus, there is only a centimeter or two to spare. A diagonal
isn't going to be part of the picture...
What application did you have in mind?
Laura Halliday VE7LDH "Que les nuages soient notre
Grid: CN89mg pied a terre..."
ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte
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Date: 18 Jun 2007 18:37:11
From:
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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On 2007-06-18 08:46:28 +1000, laura halliday <marsgal42@hotmail.com > said:
> Why not make one?
>
> It's going to be pretty stubby - camera lenses have, by
> telescope standards, very little back focus. They don't
> need much, since the focal plane is set by where the
> film/CCD is in the camera. I just tried holding eyepieces
> up to a couple of lenses, and while they reach infinity
> focus, there is only a centimeter or two to spare. A diagonal
> isn't going to be part of the picture...
>
> What application did you have in mind?
Thanks Laura - I had a feeling that there was not going to be enough
room! Oh well, I'll just use my T-ring and adapter and see how I go.
I wanted to use my 300mm f/2.8 lens as a telescope, so that I don't
have to lug a telescope along as well as my photo gear when out
camping. Just an idea to make the most out of the gear I have... :-)
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Date: 17 Jun 2007 04:23:45
From: William Hamblen
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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On Sat, 16 Jun 2007 16:32:16 -0000, macnoodle@gmail.com wrote:
>I am looking for an adaptor to be able to attach a diagonal (or just
>an eyepiece) to a Canon EF lens, for visual use.
Here's where someone made such a gadget using a rear lens cap and an
eyepiece holder:
http://www.wlcastleman.com/equip/reviews/eph_build/index.htm
I know for sure Nikon used to sell an eyepiece for their lenses, but I
can't recall seeing a commercial model for EOS lenses.
Bud
--
The night is just the shadow of the Earth.
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Date: 18 Jun 2007 18:34:16
From:
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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On 2007-06-17 19:23:45 +1000, William Hamblen <wrhamblen@comcast.net > said:
> On Sat, 16 Jun 2007 16:32:16 -0000, macnoodle@gmail.com wrote:
>
>> I am looking for an adaptor to be able to attach a diagonal (or just
>> an eyepiece) to a Canon EF lens, for visual use.
>
> Here's where someone made such a gadget using a rear lens cap and an
> eyepiece holder:
>
> http://www.wlcastleman.com/equip/reviews/eph_build/index.htm
>
> I know for sure Nikon used to sell an eyepiece for their lenses, but I
> can't recall seeing a commercial model for EOS lenses.
>
> Bud
Thanks for that, Bud. Will check it out.
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Date: 16 Jun 2007 13:22:17
From: MitchAlsup
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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You need a T-ring and a 2" (or 1.25") adapter.
The T-ring is EOS specific, while the 2" adapter is generic. The T-
ring fits the EOS bayonette and the other end is threaded to a
standard thread that all adapters are similarly threaded. I can't
recall where I got my T-ring, but my adapter came from AstroPhysics.
With these two parts, you camera becomes another eyepiece to the
telescope (which you have to rebalance for the weight of the camera).
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Date: 18 Jun 2007 18:33:48
From:
Subject: Re: eyepiece/ diagonal adaptor for Canon EOS (EF) lenses ???
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On 2007-06-17 06:22:17 +1000, MitchAlsup <MitchAlsup@aol.com > said:
> You need a T-ring and a 2" (or 1.25") adapter.
I already have both of those, so will see how they go once my lens
arrives. I thought there might be some other, more elegant solution,
but since there is so little back-focus available, I should have known
better. Thanks for you help, anyway. :-)
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