Re: Rank Taylor Hobson Varotal ??
From: Lassi Hippeläinen (lahippel_at_ieee.orgies.invalid)
Date: 08/04/04
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Date: Wed, 04 Aug 2004 10:19:26 GMT
Henry Kolesnik wrote:
>
> I just tried to focus it on a white piece of paper and it appears to focus
> with the paper flush against the rear of the lens. Later I used a piece of
> opaque vinyl (Ziplok freezer bag) and it looks like the cirlce of focal is
> flush with the rear element holder. The focused image is about 42mm in
> diameter as best I can tell the image is the size of the rear element. It's
> inverted.
To invert the image, your only choice is an extra inverting lens. The
ocular will be focused to the place where the image from the inverter
is. The inverter should have as short focal length as possible, because
the "eyepiece" will be one ocular + four inverter focal lengths long. I
don't know where to get an eyepiece like that off the shelf, but it is
buildable. Magnification will be the ratio of the focal lengths of the
zoom and the ocular.
You can still use it as an "astronomical" telescope (i.e. with inverted
image). Just focus your eye through the ocular to the rear surface of
the lens, where the image is formed.
-- Lassi
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