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PostPosted: Sun Dec 24, 2017 3:00 pm 
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Joined: Tue Dec 05, 2017 11:53 am
Posts: 495
I have forgotten what they are for

any ideas

thanks

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Celestron 8" Edge HD Evolution, Esprit 120mm triplet, 72mm APO, Sky Tee 2, 6" reflecting scope, William Optics Binoviewer, Quark Daystar Ha Chromosphere on 72mm ED, LVW8mm eyepiece and Celestron 19mm Axiom, matched W.O 10 and 20mm, and a few others, D4s, D810,

For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you


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PostPosted: Sun Dec 24, 2017 4:54 pm 
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Joined: Mon Jan 18, 2010 9:25 am
Posts: 5296
It looks like a type of Barlow lens, maybe for a particular eyepiece.

I vaguely recall that I had one.
Maybe by a British accessory maker.

If it is a negative lens, not giving an image, this is likely.

Regards,
David


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PostPosted: Sun Dec 24, 2017 5:47 pm 
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Joined: Wed Aug 02, 2006 7:08 pm
Posts: 53
Location: Huddersfax , Yorkshire
The first photo is 'barlowish' and from Astro Engineering (UK) and on sale from Astroboot (UK).Here is a copy/paste from the latters website

New item: By Astro Engineering. The AC555 MagniMax 1.25" filter thread fit photo-visual amplifier lens is new but has been removed from it packaging but is otherwise new. The AC555 screws to 1.25" filter threads on eyepieces and camera nosepieces and provides around 1.5x image scale amplification or visual magnification (depending on spacing the effect may be more or less than 1.5x). This is the latest version of the AC555 and has a male 1.25" filter thread on the rear and a female filter thread on the front. An indispensable accessory.

Hope this helps. My best wishes for Christmas and the New Year


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PostPosted: Thu Dec 28, 2017 3:33 pm 
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Joined: Tue Dec 05, 2017 11:53 am
Posts: 495
Thank you

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Celestron 8" Edge HD Evolution, Esprit 120mm triplet, 72mm APO, Sky Tee 2, 6" reflecting scope, William Optics Binoviewer, Quark Daystar Ha Chromosphere on 72mm ED, LVW8mm eyepiece and Celestron 19mm Axiom, matched W.O 10 and 20mm, and a few others, D4s, D810,

For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you


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