Re: Exact fl of lenses... 220 VR

[Andy Buck <buckwiet@xxxxxxxxx>]

The only thing that comes to my mind (weak and twisted
as it is) is that if your aspect ratio changes from ss
to ss, then the camera is not moving the film through
at the correct rate for the rotation speed, something
that is the most basic requirement of a rotating
camera. As Andy DH said, fl shouldn't have anything to
do with it. I've never had this problem with a Hulcher
and get very sharp images at any speed. People
complain about Hulchers being over (German)
engineered. It sounds like the Roundshot is even more
so (or maybe too under?). Please excuse my cynicsm.
Andy
--- Bill Glickman <bglick@xxxxxxxx> wrote:
> 
>       That was my unfortunate discovery, and it
> makes sense.  I can nail
> down a fl to .1mm at a given shutter speed.  Works
> perfect every test...
> aspect ratio is dead on.  However, when using the
> same fl, but change the
> shutter speed from 1/125 to 1/15, I can not
> reproduce the same aspect ratio.
> All other test variables remained constant.  It
> makes sense... because
> unless the motor speed is in sync at exactly every
> shutter speed,  you will
> not be using the optimum fl.  For the random checks
> I did, none worked out.
> :-(  
> 
> In a previous post a gave exact examples of this. 
> But this new found knowledge puts me in a
> quandray..... all 50 rolls of my testing were
> practically useless, unless I always shoot at the ss
> I tested at.  Otherwise I must test each of my 4
> lenses at every ss to find the exact. fl setting. 
> If not, one might as well just throw an educated
> guess in and hope for the best.  For now, I will try
> my hardest to use the ss where my test results were
> perfect.... if not, I'll just take my chances.  The
> amont of testing to determine all this information
> is time and cost prohibitive for me right now.....  
> 
> Regards
> Bill G 
>

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