From toyo8x10 at gmail.com Mon Aug 9 18:59:51 2021 From: toyo8x10 at gmail.com (K H) Date: Mon, 9 Aug 2021 18:59:51 -0400 Subject: [Jobs] Job Posting Message-ID: Greetings! My name is Kevin and I'm looking for some to help with a long term art project. Would you be able to post the following message on your job board? Thanks so much! Have a great week. Be well :) Best Regards, Kevin ~~~ Greetings, My name is Kevin and I am a photographic artist in the GTA. I was wondering if anyone could assist in building a shutter for my shutter-less lens. This of course would be a paid job. I'm looking to start using a large format camera for an experimental photographic process. The problem is I don't have any shutters for my old barrel lenses. There are shutters being made now called Packard shutters that are large enough for my old giant lenses, but you can't adjust the shutter speed with accuracy. Because my lenses are so big, a focal plane shutter would need to be mounted at the front of the lens. https://en.wikipedia.org/wiki/Focal-plane_shutter Here is an example of a dual curtain focal plane shutter which I was told would work for my lenses. Basically you have two springs holding back fabric vertically or horizontally. The front fabric curtain is closed/doesn't let light through and the rear one is open. After a microcontroller releases the front curtain, depending on the desired shutter speed the second/rear curtain closes. https://www.youtube.com/watch?v=jQuEIwQF3SQ The design I was told to try to build is a bit different than the example in the video. Instead of a rolling mechanism to reel up the shutter fabric (which can still be found in a big enough size), one would just use two extension springs that pull on the shutter fabric (one for the front fabric/curtain, and one for the rear fabric/curtain. Some issues I'm thinking of are vibrations that will cause motion blur during the estimated 1/2 to 1 second exposure and durability. Perhaps the extension spring chosen can be just enough to move a light fabric across the front of the lens. And as for durability, perhaps this shutter mechanism can be 3d printed or made of lightweight wood. If anyone can help build a durable version of this please contact me at toyo8x10 at gmail.com. Thanks for reading this. I hope you are well and stay well. Best Regards, Kevin H. ~~~ -------------- next part -------------- An HTML attachment was scrubbed... URL: