[rollei_list] Re: "Kaligar" Telephoto Accessory lens for Rollei Automat

Richard,

No, the Kaligar Accessory lenses have NEVER improved
the optical properties of any prime lens.  They only derogated
it.

Jerry

Richard Knoppow wrote:

> ----- Original Message -----
> From: "SandyF" <sbf70@xxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Cc: <cvug@xxxxxxxxxxxxxxx>; <camera-fix@xxxxxxxxxxxxxxx>;
> <idcc@xxxxxxxxxxxxxx>
> Sent: Saturday, February 25, 2006 1:09 PM
> Subject: [rollei_list] "Kaligar" Telephoto Accessory lens
> for Rollei Automat
>
> A while back, I bought a "Kaligar" Telephoto Accessory lens
> for my Rollei Automat.  I haven't used it for months, and
> now can't remember if this Accessory lens changes the
> effective speed of the f/3.5 75mm Tessar, thereby requiring
> changes in the exposure settings.
> If anyone can help, it would be greatly appreciated.
> TIA
>
> Sandy F. Ö¿Ö¬
>
>   An afocal attachment has no effect on the stop scale. The
> entrance pupil is magnified (or reduced) in the same ratio
> as the focal length, so the ratio of its size to the FL
> remains the same.
>    The entrance pupil is the image of the stop as seen from
> the front of the lens. Its size is the _effective_ size of
> the stop.
>    This is true for both afocal attachments and for simple
> diopter mensicus lenses. The difference is that the menicus
> type has no correction and will introduce aberrations into
> the optical system where the afocal attachment is at least
> partially corrected so the optical properties of the system
> are likely to be better.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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