[LargeFormat] Macro photography and movements

[john frost]

Mike:

My Agfa-Ansco 5x7 has center tilt on the rear standard, and I have a 
hard time getting that to work. My Zone VI has base tilt on the rear 
standard, and I find that much easier to use. I tilt the rear standard 
with my left hand, and focus the rear standard 'forward'. The lens to 
subject determines image size, so focusing the rear standard does not 
change the composition.


john (:>))) And I continue to work with the 5x7 - the axis tilt is not 
at the GG focus, so the point of the image that is in focus moves when 
tilting the rear standard......

Mike Finley wrote:

> On Sat, 31 Jan 2004 14:57:10 -0800, "Paul Butzi" <photo@butzi.net>
> wrote:
> 
> 
>>>Is there any difference in these difficult working situations between
>>>movements pivoting on the lens axis and one with movements pivoted from
>>>the
>>>base/rail?  Quite apart from this, macro work is made more tricky when
>>>focussing at the front standard, as  this changes simultaneously the film
>>>to
>>>lens distance and the lens to subject distance. Focussing movements at the
>>>rear standard (like a Sinar) leave lens to subject distance unaltered.
>>>This
>>>feels easier. Any experts out there like to advise please?
>>
>>I'm with you and Jim.  When working at close distances, it's a whole heck of
>>a lot easier to either use rear focus (keep the lens to subject distance
>>constant) or else set the camera to the magnification (set the lens to film
>>distance) and then move the camera back and forth to get the focus where you
>>want it.
>>
>>And I find it a whole heck of a lot easier to use rear swing and tilt, too,
>>since unless your lens is mounted so that the pivot axis runs exactly
>>through the rear nodal point of the lens, using front movements will move
>>the image around in unpleasant ways.  Using a front base tilt would probably
>>make you a candidate for the looney bin in a very short time.
>>
>>-Paul
>>
> 
> 
> Fortunately, the Cambo SC2N I'm using has axial (ish) tilt and swing,
> so I'm spared that problem!
> 
> I'd focussed on the middle of the subject and then tried to use tilt
> at the rear to get front and back in focus, and couldn't. I then tried
> front tilt, and hit the coverage problem. It wasn't until I gave up,
> and went to have a cup of coffee that I realised I was very close to
> the 1:1 ratio, which started me wondering.
> 
> I don't have any reference books for large format, but don't recall
> discussions of the Scheimpflug rule covering the macro case.
> 
> mike
> Mike Finley, http://www.efikim.co.uk
> 
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