| HouseMachine |
I bought this objective / lens for $2 lol few months ago... It is projecting the pictures on 5" Psone screen very sharply, however I' m not sure, if it will project 7" Lilliput.
I mean can I get sharp edges when using this objective and 7" screen.
Actually I will try to understand via acetate paper but I don' t have time to find acetate printing paper until weekend. So I need your opinions / inputs ;)
Also, is there any way to understand / find its focal length ? ( there is no info / text on it... )
You can find its dimensions on the attached photos. |
|
|
| HouseMachine |
| and here is the other photo |
|
|
| HouseMachine |
ok guys I think I found some useful info. Mine is probably same with this one;
| quote: | BRAUN Ultralit PL 2,8 / 55 mm MC
A wide-angle lens for the projection of miniature format and half-frame slides or for cases where a large projected picture has to be achieved at a short projection distance. |
http://www.braun-phototechnik.de/E/...s/objektive.htm
So I am very very very very lol happy. Because I saved some $$ |
|
|
| Jolly |
IMO, if my calculations are correct, either
this lens has a very wide field angle (in
your case of projecting of 5" Psone screen
it will be at least 96 deg.) or you got its focal wrong. |
|
|
| HouseMachine |
thanx jolly for the info, I' m thinking this lens is a bargain :) and it is probably a triplet lens. btw how did you calculate its focal length ? I did a research on google but I couldn' t understand those numbers :p
I don' t understand physics :D |
|
|
| dnsey |
| The easiest way to (roughly) find the f/l is to take the lens outside and point it at a distant object. Hold a piece of paper, etc. on the other side of the lens, and move it to get a sharp image. The lens to paper distance = f/l, or near enough for our purposes. |
|
|
|
