sorry about the messed up picture links, but now I finally learned how to do it correctly. heh. here are the two pictures that I tried posting.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Hmm, looks like there is two condensor lenses and the different colored piece is a filter of some sort, maybe IR or UV, I dont know. WHoa that light source thingie looks weird and scary 😀
Regards
HB
Regards
HB
Far left is a dcv, far right is a pcx, both used as a condenser set to make up 1 condenser aray. The middle green peice of glass is a UV filter.
Trev
Trev
wow, great for the info ace. Since I dont know much about lenses I will probably just use the pcx lens. Or should I use the pcx in combination with the dcv lens?
Hello
Trev, could that middle green piece of glass be IR absorbing glass? I’ve pulled a couple of slide projectors apart and they have got the same colour filter in them but placed directly in front of the lamp. So maybe they put it in the middle to get the right focal or some other reason.
This is only another possibility so don’t go spiten-th-dumb. 😀
DJ
Trev, could that middle green piece of glass be IR absorbing glass? I’ve pulled a couple of slide projectors apart and they have got the same colour filter in them but placed directly in front of the lamp. So maybe they put it in the middle to get the right focal or some other reason.
This is only another possibility so don’t go spiten-th-dumb. 😀
DJ
Hmm that depends on how wide the light from the condensers is and what size lcd your going to use, from my experience 2 condensers are always better then 1, they are much brighter and you have far less distortion in the image, but ofcourse thats only if you match up a pair correctly.
So in your case id see just how wide the beam of light is that comes from the condenser setup first, and from there determine if that light beam is wide enough to fit your lcd. Also i might add taking away the second condenser will change the focal length of the pcx lens and therfore it will change things in your design.
Trev
Its definatley UV filter bud, ir filter is pink, red, dark red, or orange depending on grade.
They more then likley placed it there so they use less of it and to use it as an optical spacer , though all lenses and filters shouldnt touch.
Trev
Hi,
I think there's a bit of confusion over terms here.
I'd call this green/blue glass an IR filter, as it's designed to block IR (by absorption or reflection) and reduce its heating effect on the film.
See
http://faraday.physics.uiowa.edu/optics/6B40.44.htm
for a picture of a similar one, clearly described as blocking IR.
Compare this with a camera UV 'skylight' filter (blocks UV), which is a pale pink.
I think there's a bit of confusion over terms here.
I'd call this green/blue glass an IR filter, as it's designed to block IR (by absorption or reflection) and reduce its heating effect on the film.
See
http://faraday.physics.uiowa.edu/optics/6B40.44.htm
for a picture of a similar one, clearly described as blocking IR.
Compare this with a camera UV 'skylight' filter (blocks UV), which is a pale pink.
thanks a lot everyone. I will first try using both dcv and pcx lenses in my setup, once I receive my lilliput 7" xga from hong kong. I will post results once I get everything up and running...
No, none at all, the colour depends on the spectrum that is being blocked, also that filter shown in the drawing does not state that, that is the actual filter being sold.
Trust me, from first hand experience in purchasing the ir and uv filters , uv filters are clearly green to a blue colour, ( dependant of the spectrum being blocked), while all of the ir filters that ive owned that are of comercial quality designed for high light capacites are the red, orange, dark red, pink, and even purple colours.
Take a look also at cold mirrors, look through them at a 0deg angle (if you have a 45deg spec mirror), and you will clearly see a very dark red filtration, and a hint of purple.
Edmund Optics a major industrial optical manufacturer can clearly back me up with my claim.
Also i might add, optical filters for cameras are very weak and do not have the same qualities of the types of filters required for projection devices, that are powered with such high light outputs.
Trev
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