Re: Horseman SW 612

[Ellis Vener <evphoto@xxxxxxxxxx>]

The Schneider only wins if you don't need the extra angle of VIEW you get
from the shorter lens.  Angle of view for a particular format is not the
same thing as angle of coverage (that the lens can produce regardless of
film format) and I believe Mitchell may have inadvertently made a mistake
when he was typing up the specs.For what is worth I have a friend who is
quite satisfied with the unvignetted 6x12cm images he gets from the 35mm
APO-Grandagon. In general my experience is that Grandagons in general have
less severe falloff problems at any given focal length than Super Angulons.
The big caveat here is that my experience with these modern ulta wide lenses
is limited to using the 47mm XL S-A and looking at my friend's
transparencies made with  his 35mm APO Grangon.

Joel:
The fact that "The light fall off is not consistently strong and seems to
vary, perhaps in relatiion to the angle of the camera relative to the sun."
leads me to believe that there is some sort of user induced problem here.
Try testing the camera by shooting  a large evenly toned  and evenly lit
subject with the camera focused at infinity. Test using the cwf and without
using the cwf. If there is a real problem it will show up here. If when you
are shooting the upper part of the sky gets darker then i think you might be
seeing normal atmospheric  horizon/sky boundary effects.

Ellis

"Mitchell P. Warner" wrote:

> Sorry I didn't get all this in the other msgs:
>
> The 45mm ApoGrandagon
>
> SPECIFICATIONS OF RODENSTOCK GRANDAGON N SERIES LENSES
>                 Lens                            45mm
> Aperture Range                          4.5-32
> Shutter Type                                    Copal 0
> Maximum Recommended Film Format (In.)   4x5"
> Angle of Coverage at f/22:                      110°
> Image Circle at f/22:                           131mm
> Filter Size Ø                                   58mm
>
> And here the spec's for the SCHNEIDERSuper Angulon 47XL
>
> SPECIFICATIONS OF SCHENIDER SUPER ANGULON XL LENSES
> Lens                                            47mm
> Aperture Range                          f/ 5.6-32
> Shutter Type                                    Copal 0
> Maximum Recommended Film Format (In.)   4x5"
> Angle of Coverage at f/22:                      120°
> Image Circle at f/22:                           166mm
> Filter Size Ø                                   67mm
>
> NOTE the much larger image circle, allowing more movement, wider angle of
> view and the larger filter size (to accomodate image circle and angle of
> view) on the Schneider.
>
>         You get what you pay for.  In this case Schenider wins.
>
> mpw
>
> At 10:00 AM 6/23/99 +0000, you wrote:
> >Has anyone had experience with a Horseman SW612?  I have one with a
> >45MM Apo-Grandagon lens that produces images with substantial light fall
> >off.
> >These images occur despite the use of the ridiculously priced and
> >overrated Rodenstock center filter!!!  The light fall off is not
> >consistently strong and seems to vary, perhaps in relatiion to the angle
> >of the camera relative to the sun. Any
> >experiences would be appreciated.  The Rodenstock filter has the added
> >benefit of producing "outstanding" examples of flare if the rays of the
> >sun even feign towards the camera .
> >
> >
> >Joel
> >
> >
> >