[LargeFormat] 5x7 Lens Information

[Rich Lahrson]

Hi Richard,

     I've used the SA 210mm/8 on a Calumet greenie and the camera could handle
the weight fine but it was sometimes hard to reach the edge of it's 1/2 meter
diameter image.  I once put the lens against a window in a darkened room
to confirm it's size.  I also had a lighweight Ikeda 8x10 with an SA 121mm/8.
Somehow, the lens seemed too large for the camera though it probably tighened
down ok.  The difference in size and weight between the SA 121 and the Angulon
120 is astonishing.  I think my Calumet was a 'greenie' that was no longer
magnesium
but aluminum.  I put it on a Tiltall and bent the Tiltall's plateform.  Later I
got a geared
tripod for it, almost a necessity with it.  My little 5x7 Seneca is great on
the Tiltall.

Cheers,

Rich Lahrson
Berkeley, California
tripspud@transbay.net

Richard Knoppow wrote:

> At 05:49 PM 08/25/2002 -0700, you wrote:
> >Clive,
> >
> >     The 165mm Angulon probably doesn't provide as much image circle as
> >the 190mm Kodak Wide Field Ektar though it is wider.  Is it f/6.3?
> >
> >Rich
> >
>   The Wide Field Ektar is a better lens although it doesn't have as much
> coverage as an Angulon. Angulons are about the same as a WA Dagor, maybe 90
> degrees stopped way down. The circle of illumination is larger, maybe as
> much as 102 degrees but the image quality beyond maybe 85 degrees isn't
> that great.
>   The wide open speed is for composing only.
>   A W.F.Ektar has about 85 degrees stopped down, not much smaller, but
> image quality is good over the whole field. Also, it doesn't have the zonal
> spherical typical of the Dagor type lenses, which the Angulon is.
>   The WF Ektar is also exceptionally well color corrected. Kodak seems to
> have made the Ektar seeries of lenses mainly to encourage the sales of
> color film.
>   Modern Biogon type W.A. lenses are better than any of the older type but
> they are larger and heavier. Some modern WA lenses have coverage well
> beyond 100 degrees.
> ----
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
>
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