hello all i was out at the flea market and seen this old 1965 ohp so i bought it for a few dollars got it home and began to strip it the frensell were in ok condition and theres a massive condenser 5 inches in DIAMETER the lense in this thing is huge and it has 3 lenses within it so i gather its a triplet it is approxamatly 4 inches in diameterand about 5 inches in lenght
![IMGDEAD]](/community/proxy.php?image=http%3A%2F%2F%5BIMGDEAD%5Dhttp%3A%2F%2Fwww.filelodge.com%2Ffiles%2F5965%2F1.bmp%5B%2FIMGDEAD%5D&hash=025b8f75a47fb66c11d4782828c2453a)
![IMGDEAD]](/community/proxy.php?image=http%3A%2F%2F%5BIMGDEAD%5Dhttp%3A%2F%2Fwww.filelodge.com%2Ffiles%2F5965%2F2.bmp%5B%2FIMGDEAD%5D&hash=378236a158fcc0a594ec53337753c966)
can any one tell if i can use these in my next projector?
can any one tell if i can use these in my next projector?
measuring focal length
You already know the focal length of the big projection lens is 14", but you can veify that: Take it outside on a sunny day around noon. Move it toward the ground until you see the smallest focussed image of the sun, then measure the distance from the ground to the middle of the lens barrel. That should be about 14".
You can also measure focal length with a closer light source, but then you have to calculate a bit. Easier to just use the sun and measure.
You already know the focal length of the big projection lens is 14", but you can veify that: Take it outside on a sunny day around noon. Move it toward the ground until you see the smallest focussed image of the sun, then measure the distance from the ground to the middle of the lens barrel. That should be about 14".
You can also measure focal length with a closer light source, but then you have to calculate a bit. Easier to just use the sun and measure.
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