will the lens that is inside of a artograph or a opaque projector work for my projector with a ps1 screen
opaque projector lens
Sure, why not? They are big lenses because they have to gather lots of diffuse rays bouncing off the object. And an opaque projector lens makes a nice image from an 8.5" by 11" piece of paper, so the field angle should be more than adequate for a little PS1 screen. The image quality should actually be higher than a normal opaque projector image, since you will only be using the center part of the lens. (Less distortion and aberrations there.) You can put the projector at the back of the room to increase your throw distance, to make the image is bigger.
You will get better results if you use a field fresnel to converge all the light through your LCD into the projection lens.
Sure, why not? They are big lenses because they have to gather lots of diffuse rays bouncing off the object. And an opaque projector lens makes a nice image from an 8.5" by 11" piece of paper, so the field angle should be more than adequate for a little PS1 screen. The image quality should actually be higher than a normal opaque projector image, since you will only be using the center part of the lens. (Less distortion and aberrations there.) You can put the projector at the back of the room to increase your throw distance, to make the image is bigger.
You will get better results if you use a field fresnel to converge all the light through your LCD into the projection lens.
Yea, I have an opaque projector, and its lens is quite perfect for up to a 19" LCD id say... Tested it with my 17" CRT, and got a perfectly focused image, can read icons at 1280x960! The lens seems completely identical to the 119.99 one from diylabs, except I payed 9.99 for the entire projector! (it has other useful parts like lens mounts, focus assembly (easy to ermove and re mount to anther case), mirror mounts, wiring perhaps, and the adjustable legs) The projector is a Bell and Howell "The Spotlight" (TS-7)
hey ancorp, i have a "spotlight" but mine is the ts-3. My lens says on it E.F. 18". Does yours say the same? Anyways i was thinking that this was the focal length and it would be to large. I have yet to test the lens in any formal way and was wondering what you think.
ukagr said:
Yes is is the focal lenght (about 450mm), but as far as I remembe, the rear focal lenght is only 380mm, thats the one that matters for all your distances and fresnels, the E.F (effective focal length) determines the magnification. You will need a quite long room for a big picture.
Oh and my lens doesnt have any markings on it.
The lens that I have is amazing, perfect sharpness of my 16" monitor.
longer fresnel
Distance between the LCD and the center of the lens will be around 530 mm when you get a focussed image on the screen, so you need a longer field fresnel. LL sells a "Pro Fresnel" with a 790 mm fl just for use with their 450 mm projection lens. That should work with this opaque projector lens. They are planning on selling 650 mm fl field fresnels too. Even better.
Distance between the LCD and the center of the lens will be around 530 mm when you get a focussed image on the screen, so you need a longer field fresnel. LL sells a "Pro Fresnel" with a 790 mm fl just for use with their 450 mm projection lens. That should work with this opaque projector lens. They are planning on selling 650 mm fl field fresnels too. Even better.
now that you have mentioned opaque projectors i'll bet the prices on ebay go up 😀
Seems every time someone mentions an idea the prices go sky high...
ok who here works for EBay?
LOL just kidding but the prices on LCD's sure go up when someone finds a newer better one😎
jmo
Gordon
Seems every time someone mentions an idea the prices go sky high...
ok who here works for EBay?LOL just kidding but the prices on LCD's sure go up when someone finds a newer better one😎
jmo
Gordon
thanks for your help guys i thought that the pro lens fresnel would work.
no doubt about the ebay trends. i remember when the projection panels were hard to get. now its the lcd panels. i got my lense free from a guy at an auction not ebay.
the bad/good thing about this lense is that it has such a long throw. i think that if my calc. is right i could get 10' projection 15 feet back with a 15" panel.
no doubt about the ebay trends. i remember when the projection panels were hard to get. now its the lcd panels. i got my lense free from a guy at an auction not ebay.
the bad/good thing about this lense is that it has such a long throw. i think that if my calc. is right i could get 10' projection 15 feet back with a 15" panel.
Rebuild into LCD projector?
Would it be reasonable to rebuild one of these into an lcd projector? My idea is to remove the lamp & socket from the inside, slide an lcd into the tray for the image source and mount the lamp w/condensor and reflector underneath. I'm still kicking myself for getting distracted and missing out on an opaque projector lens assembly that sold on ebay for about $10. There are a lot of them that may sell at a good price but the shipping is expensive. Considering the bulk and weight of these old things (met-al, can you say met-al) it's one of the few times these days that jerks arn't trying to make there money on shipping. The one I was just looking had a 1000W lamp so it could double as a room heater as well.
Would it be reasonable to rebuild one of these into an lcd projector? My idea is to remove the lamp & socket from the inside, slide an lcd into the tray for the image source and mount the lamp w/condensor and reflector underneath. I'm still kicking myself for getting distracted and missing out on an opaque projector lens assembly that sold on ebay for about $10. There are a lot of them that may sell at a good price but the shipping is expensive. Considering the bulk and weight of these old things (met-al, can you say met-al) it's one of the few times these days that jerks arn't trying to make there money on shipping. The one I was just looking had a 1000W lamp so it could double as a room heater as well.
opaque to LCD conversion
Sure, you could do it. But you would have to add a box underneath to hold the reflector, lamp, ballast, and fan(s). So what do you get out of using the opaque projector as the upper half? The mirror, projection lens, and focussing mechanism.
You could build the lower box, or you could just take the good parts out of the OP and put them all in your own box. I guess it is just a style issue. Those are useful parts, so using or gutting an opaque projector is a good idea if you find one cheap.
Sure, you could do it. But you would have to add a box underneath to hold the reflector, lamp, ballast, and fan(s). So what do you get out of using the opaque projector as the upper half? The mirror, projection lens, and focussing mechanism.
You could build the lower box, or you could just take the good parts out of the OP and put them all in your own box. I guess it is just a style issue. Those are useful parts, so using or gutting an opaque projector is a good idea if you find one cheap.
More of a 'what if'
I was just thinking of it as a 'what if' if you know what I mean. I would like to find one locally and rob parts. I assume that since it had to focus actual objects as well as flat printed material that it had a fs mirror, and a large one like that doesn't seem to be cheap. That big ole lens would be nice too. Do you know if they were multiple lens or just a singlet? as far as a ballast goes, my idea was to use the lamp assembly that was already there and from what I can tell they're incandesant. Considering how much heat the 500W lamp I've been using to test some optics, (and some now dead lcds) it might even be better as a heater than a light source for a projector. It's only about the same temp as a halogen 3200, something like that.
I was just thinking of it as a 'what if' if you know what I mean. I would like to find one locally and rob parts. I assume that since it had to focus actual objects as well as flat printed material that it had a fs mirror, and a large one like that doesn't seem to be cheap. That big ole lens would be nice too. Do you know if they were multiple lens or just a singlet? as far as a ballast goes, my idea was to use the lamp assembly that was already there and from what I can tell they're incandesant. Considering how much heat the 500W lamp I've been using to test some optics, (and some now dead lcds) it might even be better as a heater than a light source for a projector. It's only about the same temp as a halogen 3200, something like that.
I have a opaque projector that I gutted. First, the lightsource on mine was a 1000w bulb, and its definately a heater! I suggest a MH setup. Oh and there is no ballast for the bulb on my opaque projector, just a socket straight to the 120v. The lens on mine is a 135mm diameter, ~450mm focal lenght, coated TRIPLET lens. Looks identical to the one for 119.99 at diylabs. The front surface mirror inside is about the size of the lens from the side view. The lens seems all glass with an all metal casing, damn heavy. You can easly transport the focus mechanism and lens mounts, as well as the fs mirror with mounts to another box. The lens puts out an amazingly sharp image, definately ready for a nice 1080p panel (just my 2 cents)...
The weight...the weight
ancorp
Was it you that was using a crt with a triplet? I know that someone here was using a enclosed crt setup like those scams on ebay only using a big triplet not page magnifiers. I tried to get something out of my little tv using the triplet I bought for my project just to see what it would do. Even on a real projector screen it was far too dim to watch. The opaque pj stuff is interesting but I don't want to pay to ship all that steel only to discard it. If I can find one locally or just find the lens on ebay I'll go that way, the triplet I already have was fine for the 5.6" but I'm getting a 12" from 18wheeler and think a larger diameter would be better. Saw a lens today at the high-end/collectables shop part of the local goodwill but if it is usable it would take a lot of very careful disassembly.
ancorp
Was it you that was using a crt with a triplet? I know that someone here was using a enclosed crt setup like those scams on ebay only using a big triplet not page magnifiers. I tried to get something out of my little tv using the triplet I bought for my project just to see what it would do. Even on a real projector screen it was far too dim to watch. The opaque pj stuff is interesting but I don't want to pay to ship all that steel only to discard it. If I can find one locally or just find the lens on ebay I'll go that way, the triplet I already have was fine for the 5.6" but I'm getting a 12" from 18wheeler and think a larger diameter would be better. Saw a lens today at the high-end/collectables shop part of the local goodwill but if it is usable it would take a lot of very careful disassembly.
camera lenses
The only camera lenses you can use are those made for large format photography. Like for 8" by 10" film! Normal 35 mm camera lenses are designed for film the size of a 35 mm slide. You would have to use an LCD around that same size.
Besides the very expensive large format photography lenses, the other usable type of photography lens is a "process lens". These are used for making lithography masters in the printing trade and for making integrated circuit masks. They cost $1000 to $5000 dollars each!
OHP and opaque projectors are a unique resource for DIYers: They were mass produced, and now have been made almost obsolete by scanners and commercial LCD projectors. So you can find great deals on them and use their lenses and fresnels for your projector.
The only camera lenses you can use are those made for large format photography. Like for 8" by 10" film! Normal 35 mm camera lenses are designed for film the size of a 35 mm slide. You would have to use an LCD around that same size.
Besides the very expensive large format photography lenses, the other usable type of photography lens is a "process lens". These are used for making lithography masters in the printing trade and for making integrated circuit masks. They cost $1000 to $5000 dollars each!
OHP and opaque projectors are a unique resource for DIYers: They were mass produced, and now have been made almost obsolete by scanners and commercial LCD projectors. So you can find great deals on them and use their lenses and fresnels for your projector.
Suggestions?
I just got a response to my question to a seller about a op for sale on ebay.
There are two elements, one on each end of the barrel, so I guess you would have to call it a doublet -- although it is very widely separated. The barrel is about 3.5 inches in diameter but the elements are both masked down to a little under 2.5 inches. Best Regards,
Does this seem any better than the arounc 2.25 inch or so triplet that I already have. I've already found that the one I have focuses well with the cheap page magnifiers I'll be using. It doesnt look like the masking could be removed. What do you think?
thanks
I just got a response to my question to a seller about a op for sale on ebay.
There are two elements, one on each end of the barrel, so I guess you would have to call it a doublet -- although it is very widely separated. The barrel is about 3.5 inches in diameter but the elements are both masked down to a little under 2.5 inches. Best Regards,
Does this seem any better than the arounc 2.25 inch or so triplet that I already have. I've already found that the one I have focuses well with the cheap page magnifiers I'll be using. It doesnt look like the masking could be removed. What do you think?
thanks
Attachments
Re: The weight...the weight
Yes I did. It was a 175mm diameter triplet (huge!!!) and a small tv. Wasnt bright, but fine for 60" and ok for 80". If the tv was new enough to have a service menu, I could have had a decent result... Got a CRT projector now, still trying to get it runing (put in the glycol todaym waiting for the silicone to dry... will setup 2moro)
Cheers,
Alex
justme said:
Yes I did. It was a 175mm diameter triplet (huge!!!) and a small tv. Wasnt bright, but fine for 60" and ok for 80". If the tv was new enough to have a service menu, I could have had a decent result... Got a CRT projector now, still trying to get it runing (put in the glycol todaym waiting for the silicone to dry... will setup 2moro)
Cheers,
Alex
ancorp
"put in the glycol todaym waiting for the silicone to dry"
Is that the antifreeze type stuff? I had an old sony a few years ago that was kind of dim. I read that it was alge like stuff living in the coolant. It looked too complicated and I was afraid I might spill it and my cat would drink it and then I'd have a dead cat. (ok I'm a big baby) Anyway, is that what you were talking about?
"put in the glycol todaym waiting for the silicone to dry"
Is that the antifreeze type stuff? I had an old sony a few years ago that was kind of dim. I read that it was alge like stuff living in the coolant. It looked too complicated and I was afraid I might spill it and my cat would drink it and then I'd have a dead cat. (ok I'm a big baby) Anyway, is that what you were talking about?
- Status
- Not open for further replies.