P3D Re: my 2 cents worth on adjusting projectors

["Norm in S.F." <normlehf@xxxxxxxxxxx>]

Project3D@xxxxxxx wrote:
> 
> In a message dated 30/06/98 18:59:52 GMT, Paul Talbot wrote:
> 
> << Bob Aldridge wrote:
> 
>  > major adjustments may be needed where the chips are not at the same
>  > height [snip] with the projector adjusted so the homologues are level
>  > - the apertures will not be, will probably ghost, and will certainly
>  > float.
> 
>  This is a very significant point that deserves to be emphasized, IMO!!
>  Just today I was reading Ferwerda's comments that vertical misalignment
>  cannot be corrected through projection adjustment. 

Well, I am going to say it again, even though everyone
ignored it the first time:
If you mask the screen, projection adjustments can correct
all mounting
errors other than rotational ones.

I grant you that, with tightly composed shots, the
photographer's intention
may be slightly compromised by this approach--and it
certainly should not be used
in contest projection. 

But for occasions where folks of various degrees of
competence and craftsmanship
just want to get together and share their pictures, it is a
good solution--expecially
when vertical errors are evident.

Norm Lehfeldt


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