Looking for a lens...

[Mike Kennedy]

I really don't know if this will help but I have 4 broken lenses.Glass is complete but they are beyond repair.You're welcome to any one of them.

Mike

[JBrunner]

I really don't know if this will help but I have 4 broken lenses.Glass is complete but they are beyond repair.You're welcome to any one of them.

Mike

I love APUG. The spirt of kindness and help here ia simply amazing.

Mike, most camera lens elements are pretty short, on the order of a couple of inches. Placed together they usually create even shorter lengths. I'm tring to focud an image at 10 feet. I have played with busted lens elements, and although they have served to demonstrate the principle quite well, I haven't found a combination that comes even close to working for the actual CO.

[JBrunner]

Ok,

I have e-mailed a local optician with the request for a lens. Hopefully they will realize I'm not a crank.....:o

[Murray@uptowngallery]

So, JB, is this a 'traditional' C.O. that illuminates a table of sorts, that constrains you to a fixed length of 10 feet?

[JBrunner]

So, JB, is this a 'traditional' C.O. that illuminates a table of sorts, that constrains you to a fixed length of 10 feet?

This one will come strait in my bedroom window, and give me the morning upside down and backwards on the wall at the foot of my bed. The distance from the window to the wall is ten feet.

[jnanian]

jason

i think in abelardo morell's book he says how to set a room up
like a camera obscura ... i don't have it, but i know he does this sort of thing
and i remember he has diagrams or instructions &C ...
maybe the book has lens info ? or maybe he just uses a just a hole, and no glass ...

good luck!

john

[jimgalli]

Jason, we've got 117" f8 mirrors out here where I work that will resolve 40 lppm. On half frame 35mm I can only get about half the moon in a frame. Talk about cheeze. They would look damn funny sticking out of a bedroom wall though.

[Steve Smith]

This one will come strait in my bedroom window, and give me the morning upside down and backwards on the wall at the foot of my bed. The distance from the window to the wall is ten feet.

I have a friend whose parents used to own a large victorian era house which was built for a portrait photographer. There was a downstairs toilet which had a lens mounted in the wall which projected an image of the garden on the wall opposite so you could watch it whilst sitting (did I spell that correctly?).

The distance in this case was about 6'


Steve.

[Phil]

Here's a lens with an 8.5 foot focal length:

http://www.surplusshed.com/pages/item/l3854d.html

[Murray@uptowngallery]

Holy Krap...a pair of those for a 1.3 meter Rapid Rectilinear kinda lens, albeit not made with achromats...

No Ball Bearing shutters that big but I do have a box of those large lazy susan bearings...