New article: guillotine shutters

[Mike Anderson]

Hmm... you could do it by dropping a speed graphic between two boards with an opening cut in them. You might need to reduce friction by removing the handle.

That's funny. I'm not too proud to give you a for that.

...Mike

[dsphotog]

DAMMMN! Thats GENIUS!

[GPS]

Forgo all the timing/angle considerations by just mounting a 4x5 Speed Graphic to the lens board.


Seen here

Could you post a detailed picture of the attachment way of the camera to the lens board? Just curious...

[BobCrowley]

It's just a square aluminum plate, a spacer, and another plate the size of the lens board. Machined here on the Bridgeport. I've used this several times with good results, no vignetting, and I mount a shade and/or filters on another SG standard on the track, too.

The shutter kick isn't bad at all, the real limitation being the wobbly Saltzman design.

http://new55project.blogspot.com

[GPS]

It's just a square aluminum plate, a spacer, and another plate the size of the lens board.
...

http://new55project.blogspot.com

Glad to hear it, Bob. For a moment I though it was just Photoshopped there as a prank...

[Eric Ashcroft]

Yep, I just read Bill Kumpf's post,& was goin' to ask a question,but,as it's most informative & easy to u/stand,+ one would hope any LF Photog' would have enough little grey cells to make one,but ?.
The thought that the shutter blade accelerates while dropping,with subsequent uneven exposure,suddenly became self explanatory.
As our Image is upside down, then the ground area would get marginally more exosure than the sky,which would be great for Landscapes---or am I wrong ?.
I'm studying this because I've acquired (yep a bit stupid I know-but could not resist it ) a great big Kodak Ektar,& I have to make a shutter about 6" square so,
any quick sensible thoughts appreciated, Kind R'grds to one & all.

[AtlantaTerry]

Rubber bands were mentioned along with the problem that they dry out.

I make my own "rubber bands" out of sections of inner tubes. I get blown out inner tubes from bicycle repair shops for free. I suppose other sizes can be found for other tires such as wheel barrows to automobiles to trucks.

[Jac@stafford.net]

Rubber bands were mentioned along with the problem that they dry out.

Good grief, they are cheap enough to buy when needed.
.

[Jac@stafford.net]

Forgo all the timing/angle considerations by just mounting a 4x5 Speed Graphic to the lens board.

Another example of a brilliant creation due to Cabin Fever from Duluth, Minnesota where it has snowed every month of the year but August.
.

[Jim Noel]

And if you wanted to make a De luxe version you could put a small drop of oil between the blades to make it slip with less friction even in more inclined positions. Olive oil (extra virgin) would do...;-)

Using oil will actually slow the drop. I tried it.