Mkillmer
16-Aug-2013, 15:17
I just received my first Packard shutter - Wow! These shutters are so simple, but clever! mine is 60 years old and seems to work really well!
I am planning on pairing mine with an APO-Ronar 360mm for use in my Calumet C-1.
Lately I have been taking portraits on paper negatives - usually I do this with studio flashes. I hope to try outdoor paper negative portraits light by sun and reflectors.
My paper seems to be rated at ISO 3 indoors under strobes, but will probably be a bit higher outdoors.
Let's say it is ISO 10.
Still getting to the question...
The processes of squeezing the bulb and releasing the bulb seems to take about 0.7 seconds - lets say for simplicity it is 1 second for the process of closed to open to closed.
Roughly speaking, since the shutter is open about half the time of this process, this gives the shutter a speed of 1/2 second (a rough approximation).
Using sunny 16 I can say this means f/32 is a good starting point for for my testing exposures.
Now to the question...
The shutter has internal leaves that open from the centre and close towards the centre - so...
Does a Packard shutter when fired quickly have vignetting caused by the shutter leaf movement?
I am planning on pairing mine with an APO-Ronar 360mm for use in my Calumet C-1.
Lately I have been taking portraits on paper negatives - usually I do this with studio flashes. I hope to try outdoor paper negative portraits light by sun and reflectors.
My paper seems to be rated at ISO 3 indoors under strobes, but will probably be a bit higher outdoors.
Let's say it is ISO 10.
Still getting to the question...
The processes of squeezing the bulb and releasing the bulb seems to take about 0.7 seconds - lets say for simplicity it is 1 second for the process of closed to open to closed.
Roughly speaking, since the shutter is open about half the time of this process, this gives the shutter a speed of 1/2 second (a rough approximation).
Using sunny 16 I can say this means f/32 is a good starting point for for my testing exposures.
Now to the question...
The shutter has internal leaves that open from the centre and close towards the centre - so...
Does a Packard shutter when fired quickly have vignetting caused by the shutter leaf movement?