New to Packard shutters - a quick question

[Mkillmer]

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?

[Dan Dozer]

In answer to your question, probably not.

Now, are you understanding your shutter correctly. The shutter is designed to operate two different ways. The first is as you say, that you manually open and close the shutter with the bulb. The second is that the shutter opens by squeezing the bulb and then automatically closes with about a 1/20 sec. shutter spead. There is a small knob/pin on one side of the shutter that is there to give you both settings with the knob either pushed in or pulled out. If you don't have the knob, look for a tiny hole. You can push a paper clip in to give the same affect of the knob/pin. Were you aware that the Packard Shutters operate this way?

[Mkillmer]

If you don't have the knob, look for a tiny hole?
Hi Dan,
Thanks for your comments - I knew packard shutters are meant to have the control, but I dont seem to have the "mode control pin" described in this excellent article (figure 5):
http://dougkerr.net/Pumpkin/articles/Packard_Shutter.pdf
I guess mine was made without this mode?

[Jim C.]

There were different styles of Packard shutters made, easiest way to know if you have one that will give instantaneous
is to look for a cylindrical projection on the pneumatic cylinder side of the shutter, it's at about 1 o'clock.
That's the receptacle for the instantaneous pin, if you have that then you have instantaneous if not then you don't.

[Jim C.]

Here's a picture of what I'm talking about, the lower right one does not have instant
the one's with the projection circled yellow has instant.
100279

[Reinhold Schable]

I'm not sure if a 60 year old Packard had the "number 6" feature (the synchronizing pin that Jim illustrates).
You have what we now know as a "number 5" shutter.

Here's how they both work:
The #6... http://www.youtube.com/watch?v=2n-4Rp1lB5A&feature=youtu.be
The #5... http://www.youtube.com/watch?v=JXc2E94_aMw&feature=youtu.be

A bit more here...
www.re-inventedPhotoEquip.com

Reinhold

[Mkillmer]

Thanks for the video links Reinhold. It looks like I have a #5. Mine is very similar to the one in the video, except my rubber bladder has carved wooden plugs, not black plastic like in the video.

[Jac@stafford.net]

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?

No, for the same reasons a leaf shutter does not.

[premortho]

For whatever it is worth, my 95 rear old Packard shutter has the "instant" feature.
I'm not sure if a 60 year old Packard had the "number 6" feature (the synchronizing pin that Jim illustrates).
You have what we now know as a "number 5" shutter.

Here's how they both work:
The #6... http://www.youtube.com/watch?v=2n-4Rp1lB5A&feature=youtu.be
The #5... http://www.youtube.com/watch?v=JXc2E94_aMw&feature=youtu.be

A bit more here...
www.re-inventedPhotoEquip.com

Reinhold

[holbrookh]

Thanks for the YouTube links they have sold a problem for me - not those specifically but I found a similar one that helped me!