DIY Camera Lucida

I found I need a camera lucida to present my sister and another one to use at summer light at garden.

Neolucida offers them but I dont know when they are available and available ones climbs more than 100 dollars with postage.

I think a 45 degree mirror and a top viewfinder hole is the construction. What else do I need to know ?

ps: I found few papers at web and they always add a beam splitter to the mirror. Edmund scientific sells 17mm beam splitters for 29 dollars ad bigger ones climbs.

I found Bert's link very rewarding.

It uses only a transparent plastic piece or glass , preferably 8x10 inches to 80mm x 40mm and thats all. I found few papers , opened a article and posted there. Everything , angles , sizes , calculations are there. I am attaching the most simple one here again.

article there was a url link here which no longer exists)

Thanks ,
Umut

A drawing board, piece of paper and pencil.

Might help you getting some ideas:

https://sites.google.com/site/freeobscura/

http://www.motherearthnews.com/diy/camera-lucida-zmaz81sozraw.aspx#axzz2xfyH3AZA

https://www.youtube.com/watch?v=HwqemdN9zac

Hello Bert,

I found the second link is most interesting. I found at web more and posted a article. I am wishing to visit holland one day but may be 20 years later if I stay alive. I am dialing to vpn to see the first site .

ps: I looked to first link and carried the plan drawing to article. Thank you.

(there was a url link here which no longer exists)

Thank you Cliveh too.

Umut