There are some silly rules and mathematics in photography, here is a theoric base for setting up the distance for projection, as can be used for exhibition and flatscreen.If L is the wideness of the projected area, then the first viewers has to sit at 3 times this measurement and the last one at 4,5 times this distance.
Not practical, cannot be used in cinemas and I think when I play the last version of my favorite killing game on my Playstation 3 on my 42 inch flatscreen, I would be complete out of the game.
I know, when you aren't french born, this language is very difficult to learn. But this manual, from the Hong-Kong made Comax, has broken some records : 41 french grammatical mistakes. Maybe it was made in times that the spellchecker didn't exist, or the chinese/english keyboard didn't had the french accents...
I found this beauty on a fleamarket in Ostend, Belgium. The price was 60 Euro. Nothing wrong with the Jupiter 11, the Leica IIIc has a slow first curtain and a bit faulty slow speeds, but that's for later,... The strange thing is : this russian lens was made for a the early Zenit's with a M39 fitting before the got the M42 lensfitting. This lens works only at closer distance because the distance between film and lens is different between M39 and M42. So this combination only works for macro. Can you imagine the impossible work to get something macro sharp with this rangefindercombination! Anyway good lens, good camera, good price, happy me! 
Due to the epidemy of e-coli in Europe, I highly recommend to decontaminate this camera before use! 
Parallax error can be seen when taking photos with many types of cameras, such as twin-lens reflex cameras and those including viewfinders (such as rangefinder cameras). In such cameras, the eye sees the subject through different optics (the viewfinder, or a second lens) than the one through which the photo is taken. As the viewfinder is often found above the lens of the camera, photos with parallax error are often slightly lower than intended, the classic example being the image of person with his or her head cropped off. This problem is addressed in single-lens reflex cameras, in which the viewfinder sees through the same lens through which the photo is taken (with the aid of a movable mirror), thus avoiding parallax error.(Source Wikipedia)
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From the famous picture : Dali Atomius, Philippe Halsman 1948. Here is a serie of shots during the studiosession. The idea of the picture is to create a methaphysical and surrealstic shot by shooting floating items as a way of creativity for the artist Salvador Dali. To compose a shot like this, three of picturial elements has to be "flying" : Salvador Dali himself, water, and ...cats. On the last one you can even see 3 of this poor animals. Imagine some studiocrew with some cats in their hands waiting for the signal to throw them in the air. Maybe these cats where drugged to death, you can throw them once, maybe twice, but the third time this animal will become wild as hell, and probably these cats were soaked aswell. Poor cat or poor studiocrew...
