rippo
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- Sep 12, 2006
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(posted this to largeformatphotography.info as well, because i've been discussing parts of this there. apologies if you see the post both places.)
Wow, won't my clients be blown away!! (har, har)
Portrait lens cobbled together from some lens elements and PVC plumbing pipe, and a few bits and pieces. Mounted onto a packard shutter (that wood bit is going to get painted too), which is in turn mounted to a standard lensboard with some extra holes drilled in it.
I took some polaroids with it, and the lens and shutter combo appears to be working. However my polaroid back isn't working as well, so I don't have any pix to post yet.
The lens should be about 200mm, however the nodal point is about half way down the tube I think. So I can't actually focus at infinity with this set up, because I can't get the standards close enough. Good thing it's a portrait lens.
I have a landscape lens I've made too, which is just one element. Haven't tried it yet.
The packard is mounted so that I can't easily access the 'instantaneous' (1/25 s) hole to put a pin in it. So I'm limited to about 1/8 s shutter speed or slower, and it's completely manual to open and close it. Slow film such as Ortho-Litho, or dark and gloomy interiors are going to be necessary.
Lens design from 'Primitive Photography' book. Packard mount technique by <a href="http://www.largeformatphotography.info/forum/showthread.php?t=23098">Ash</a>.
This is designed so that I can make lenses and mounts that bolt onto the front of the packard shutter. That way I don't need multiple packards.
Wow, won't my clients be blown away!! (har, har)
Portrait lens cobbled together from some lens elements and PVC plumbing pipe, and a few bits and pieces. Mounted onto a packard shutter (that wood bit is going to get painted too), which is in turn mounted to a standard lensboard with some extra holes drilled in it.
I took some polaroids with it, and the lens and shutter combo appears to be working. However my polaroid back isn't working as well, so I don't have any pix to post yet.
The lens should be about 200mm, however the nodal point is about half way down the tube I think. So I can't actually focus at infinity with this set up, because I can't get the standards close enough. Good thing it's a portrait lens.
I have a landscape lens I've made too, which is just one element. Haven't tried it yet.
The packard is mounted so that I can't easily access the 'instantaneous' (1/25 s) hole to put a pin in it. So I'm limited to about 1/8 s shutter speed or slower, and it's completely manual to open and close it. Slow film such as Ortho-Litho, or dark and gloomy interiors are going to be necessary.
Lens design from 'Primitive Photography' book. Packard mount technique by <a href="http://www.largeformatphotography.info/forum/showthread.php?t=23098">Ash</a>.
This is designed so that I can make lenses and mounts that bolt onto the front of the packard shutter. That way I don't need multiple packards.

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