I have three of these in the basement, And I might take a stab at seening what they do with a larger lcd 'area' by faking something and seeing how it turns out.
The focal distances and planes are notably different than that which a air-coupled lens is designed for. Thy might be workable up to a 10-12" LCD panel. Finer optics....money -cannot- buy. Which is why it might be nice to use them.
Also, their are many elements in these lenses..and they can all be taken apart. I should know, I've taken apart many of them
Sadly, I've had to throw out ..about 30 such lenses. Too much stuff! All I have left are the three LC 9" lenses.
I do know if someone who has many, many, many of these for sale, if neeed be. That's Curt Palme of the CRT area on the AVS forum. He likely has about 50 or more spares. Maybe more.
Do the double fresnels work pretty good for light source collimnation??? I know a company who makes such beasts themselves,and if anyone is properly interested, I can possibly arrange a bulk buy. Who knows.
The focal distances and planes are notably different than that which a air-coupled lens is designed for. Thy might be workable up to a 10-12" LCD panel. Finer optics....money -cannot- buy. Which is why it might be nice to use them.
Also, their are many elements in these lenses..and they can all be taken apart. I should know, I've taken apart many of them
Sadly, I've had to throw out ..about 30 such lenses. Too much stuff! All I have left are the three LC 9" lenses.
I do know if someone who has many, many, many of these for sale, if neeed be. That's Curt Palme of the CRT area on the AVS forum. He likely has about 50 or more spares. Maybe more.
Do the double fresnels work pretty good for light source collimnation??? I know a company who makes such beasts themselves,and if anyone is properly interested, I can possibly arrange a bulk buy. Who knows.
Many 7" LCD projectors being built
If these CRT lenses can focus on a flat 7" diagonal LCD, then there certainly are a lot of people who could use them. I suspect they would even be willing to pay some money for them.
Some builders using 5" PSone LCDs have used smaller diameter CRT lenses with great success, but builders using 7" Lilliput LCDs have had to find other alternatives. If these lenses are really 9 inches in diameter, then that would permit the use of several designs that do not require a focussed fresnel condensor system.
Why don't you try projecting a backlit 7" diagonal transparency to see what you get?
If these CRT lenses can focus on a flat 7" diagonal LCD, then there certainly are a lot of people who could use them. I suspect they would even be willing to pay some money for them.
Some builders using 5" PSone LCDs have used smaller diameter CRT lenses with great success, but builders using 7" Lilliput LCDs have had to find other alternatives. If these lenses are really 9 inches in diameter, then that would permit the use of several designs that do not require a focussed fresnel condensor system.
Why don't you try projecting a backlit 7" diagonal transparency to see what you get?
the lens end is 5.75 inches across, circular. the 'focal point' is for CRT projection tubes, that are 8" diagnally, and that 8" as a point of full coner to corner 'focus', on that flat surface. I suspect that they would do quite nicely.
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