If anybody is interested, I may sell my 4 prisms as I won't be working on a DIY project for a while. I think I paid $126 CDN for my 4 prisms. I barely tested out two of them. They are un-scratched. I would sell them for around $100 for the 4 prisms if I sold them. I wouldn't mind playing around, but I think I may just pass on a DIY project for now.
bluesboyjr said:
They're not triangles. 🙂 The top is flat.
That said, I'd been looking for another source on the ones you found at better prices, and that's the best I've seen - they're definitely bigger angles.
C
cjd said:
Gotcha. I figured it had to be something simple. I guess I will have to wait until I receive them, to give you the true angles. They are supposed to ship out on Monday at the latest, so I should receive them next week sometime.
diy anamorphic lens for a diy projector
I have been researching and amassing parts for a diy projector but this anamorphic diy solution (ie the trophy-based anamorphic design) might solve a lot of issues facing diy projector builders.
If you are not aware, most of the designs available (lumenlab, diypj, all-in-box, etc) revolves around the use of a 15" or smaller computer 4:3 lcd display. And for the most part, the earlier lcds (or even their crt counterparts) do not scale anamorhic signals natively. So if you were to set your dvd player to 16:9 display or watch hdtv (ota, cable, or satellite), the resulting image would have the compressed vertical image like below:
But if you couple the trophy-morphic lens to a diy pj based on this 15" lcd display, you would be able to utilize all the pixels when displaying a 16:9 image more so than if you simply set your dvd player to a 4:3 image or scaled the hdtv signal to fit correctly. I'm not overly concerned with 2.35 or CIH capability, btw.
Note: Yes, it is possible to buy a 16:9 lcd or even a 4:3 lcd that can handle anamorphic signals for diy pj building but for most starting off in building one, lcd costs usually dictate the older lcds I described above.
Now a diy projector differs a lot from a commercial but the most glaring (in the sense that is pertinent to this post) is lack of a zoom feature on the focus lens assembly. So like a crt-based projector, the size of the screen is determined by the location of the projector. And since most diy pj lenses are typically short-throw, possibly 1:1 ratio, I am wondering if the performance of a diy lens will be affected by the lack of a zoom on the pj.
I've read Steve's and Markp's posts on the using the diy lens on their pjs but they are using commercial units. I would like to know from those if this is something worth in advancing diy pj building.
Victor
I have been researching and amassing parts for a diy projector but this anamorphic diy solution (ie the trophy-based anamorphic design) might solve a lot of issues facing diy projector builders.
If you are not aware, most of the designs available (lumenlab, diypj, all-in-box, etc) revolves around the use of a 15" or smaller computer 4:3 lcd display. And for the most part, the earlier lcds (or even their crt counterparts) do not scale anamorhic signals natively. So if you were to set your dvd player to 16:9 display or watch hdtv (ota, cable, or satellite), the resulting image would have the compressed vertical image like below:
An externally hosted image should be here but it was not working when we last tested it.
But if you couple the trophy-morphic lens to a diy pj based on this 15" lcd display, you would be able to utilize all the pixels when displaying a 16:9 image more so than if you simply set your dvd player to a 4:3 image or scaled the hdtv signal to fit correctly. I'm not overly concerned with 2.35 or CIH capability, btw.
Note: Yes, it is possible to buy a 16:9 lcd or even a 4:3 lcd that can handle anamorphic signals for diy pj building but for most starting off in building one, lcd costs usually dictate the older lcds I described above.
Now a diy projector differs a lot from a commercial but the most glaring (in the sense that is pertinent to this post) is lack of a zoom feature on the focus lens assembly. So like a crt-based projector, the size of the screen is determined by the location of the projector. And since most diy pj lenses are typically short-throw, possibly 1:1 ratio, I am wondering if the performance of a diy lens will be affected by the lack of a zoom on the pj.
I've read Steve's and Markp's posts on the using the diy lens on their pjs but they are using commercial units. I would like to know from those if this is something worth in advancing diy pj building.
Victor
I'm selling my projector and prisms...due to major car repairs!
Optoma H31 DLP projector: 1080i capable, 16:9 native, ONLY 138 hours used on bulb!
$425 SHIPPED U.S.A.
I have TWO J25 glass prisms (5x7) already taped outer edges.
I paid $95 shipped (80 plus shipping)
I'm selling the 2 PRISMS only for $65 shipped CONUS only. I ship PRIORITY with Delivery Confirmation.
Payment by US POSTAL Money Order only!
If anyone is interested email me at artbypaul@yahoo.com
They work AWESOME!
Actual screen photo.
Optoma H31 DLP projector: 1080i capable, 16:9 native, ONLY 138 hours used on bulb!
$425 SHIPPED U.S.A.
I have TWO J25 glass prisms (5x7) already taped outer edges.
I paid $95 shipped (80 plus shipping)
I'm selling the 2 PRISMS only for $65 shipped CONUS only. I ship PRIORITY with Delivery Confirmation.
Payment by US POSTAL Money Order only!
If anyone is interested email me at artbypaul@yahoo.com
They work AWESOME!
Actual screen photo.
That looks good. Good luck with your sale. If anybody in the US wants prisms and a projector together, that's a great way to go.
Well I have decided for sure that I will sell my prisms as I am in need of cash and won't be DIY'ing for a while. If anybody wants 4 prisms together, mine are the medium J25 Optic Crystal Wedges from Massillon Plaque Company (5" x 7" x 1.5"). $100 CDN for the 4 prisms. Especially convenient if you are located local to Toronto or southern Ontario as I am willing to meet the buyer half way up to 100 KM away or you pay shipping.
Use the link below to Email me if interested or if that doesn't work, email me at morkys@hotmail.com
Well I have decided for sure that I will sell my prisms as I am in need of cash and won't be DIY'ing for a while. If anybody wants 4 prisms together, mine are the medium J25 Optic Crystal Wedges from Massillon Plaque Company (5" x 7" x 1.5"). $100 CDN for the 4 prisms. Especially convenient if you are located local to Toronto or southern Ontario as I am willing to meet the buyer half way up to 100 KM away or you pay shipping.
Use the link below to Email me if interested or if that doesn't work, email me at morkys@hotmail.com
Good luck with your sale as well, Morkys!
Yeah, I hate to part with my theater but such is life! I'll do it again when I can afford it.
Everyone has been blown away by the image at 10 feet.
By the way, I will sell the projector and the 2 prisms for $450 SHIPPED FedEx Ground!
Yeah, I hate to part with my theater but such is life! I'll do it again when I can afford it.
Everyone has been blown away by the image at 10 feet.
By the way, I will sell the projector and the 2 prisms for $450 SHIPPED FedEx Ground!
DIY PJ, DIY Prisms
I don't want to hijack the thread- but I am starting a topic at the LumenLab forums about anamorphic lenses for the DIY projectors. My first attempt are 10 degree water prisms as a proof of concept. They're both 8.5"x11" (so really huge! 🙂 )
Feel free to drop by and check it out - I'd appreciate any of the wisdom from those who frequent this thread. LumenLab Post Thanks for providing the info to get this project off the ground.
I don't want to hijack the thread- but I am starting a topic at the LumenLab forums about anamorphic lenses for the DIY projectors. My first attempt are 10 degree water prisms as a proof of concept. They're both 8.5"x11" (so really huge! 🙂 )
Feel free to drop by and check it out - I'd appreciate any of the wisdom from those who frequent this thread. LumenLab Post Thanks for providing the info to get this project off the ground.
Re: CWD46 and CWD57 Pricing
Hey, have you received those prisms yet? Getting ready to work on a lens, want to know how the order went and stuff before I try ordering.
C
Hey, have you received those prisms yet? Getting ready to work on a lens, want to know how the order went and stuff before I try ordering.
C
I ordered the small CWD46 last week. Should have it soon. Hopefully it is not too small. I contacted llopt.com for broad band AR coating, they quoated me $300 for coating two wedges on both sides.
Re: Re: CWD46 and CWD57 Pricing
They just came in today. I won't get a real good chance to play with them until the weekend, though. It's hard to believe how large and heavy these actually are, until you see them in person. I will take a few pics so you can see them.
cjd said:
They just came in today. I won't get a real good chance to play with them until the weekend, though. It's hard to believe how large and heavy these actually are, until you see them in person. I will take a few pics so you can see them.
As promised, here are some pictures of the prisms and an ice cold Sammy Adams for size reference.
Here are the cases they come in.
A pic of the cases open and prisms inside.
A nice shot of the prisms.
BTW, I measured the true angles of the prisms and they are both 14.5 degrees. This is great news for those of you looking for larger angled prisms.
Here are the cases they come in.
A pic of the cases open and prisms inside.
A nice shot of the prisms.
BTW, I measured the true angles of the prisms and they are both 14.5 degrees. This is great news for those of you looking for larger angled prisms.
I also received my CWD46 yesterday. A little dissapointed though because they were suppose to be the same, yet one is taller by 2mm and there is a sliight difference of angle.
Sorry I meant to say that the angle measured was slightly different. I put the prisms flat side by side and found the degree of slant were slightly different. It makes me question the quality of these prisms. I don't know ......maybe It was just bad luck that I received a bad piece.?
sc said:
Did you measure the angles? If so, what were the measurements? Hopefully, they will still be able to work out for you.
I decided to double check my prisms after sc's response. I found that one prism is about 1 mm larger on the 2" dimension and just a slight bit longer on the 7" dimension (<1mm). So, mathematically the angles are slighlty different, but when I put them on top of each other the angles look nearly identical.
Can anyone who owns the J series put the prisms on top of one another and see how close their dimensions are to one another.
Thanks.
Can anyone who owns the J series put the prisms on top of one another and see how close their dimensions are to one another.
Thanks.
You know, the way these are intended to be used, I'm not surprised at the slight variance. And that would absolutely support an observation someone (don't recall who, sorry) made about needing to get a handful and MATCH them for best results.
C
C
We are using them at different angle and trying to reverse the diffraction issues this will never be perfect as the light spreads once diffracted until it hits the second prism. If it we were trying to exactly cancel the first prism then we would want matched prisms, but as we want to modify the image unsymmetrically an exact match isn't required. Earlier trials with anamorphic lenes were of different sizes and filled with liquids of different refractive indexes. So as we are doing different operations with each they being the same doesn't help, in fact we would probably be better off with two differnt prisms to allow for greater adjustment.cjd said:
Originally I had the initial impression that prisms with larger angles produced less CA, but after taking some more careful measurements, I'm actually not seeing much difference.
I don't actually have large angled prisms, I've just simulating them by using two of the small angled J series prisms.... but in the end I found that just using two small angled prisms (J24's) gave me an image with about the same CA as using four J24s (but with less reflections).
But I look forward to hearing the results of those who are using the CWD series because the angle is different than what I get with two J24 prisms, and there's no reason they shouldn't work well.
I have mixed prisms with different angles in the past (more specifically, I've mixed J24 prisms with J26 prisms which vary by about 0.5 degrees). I measured a tiny increase in the CA, but it was small enough that I couldn't guarantee that it wasn't due to measurement error. Pincushioning didn't change either. I did measure less astigmatism when I just used two J24 prisms, so that's what I decided to stick with in the end. This might not have anything to do with the angles, but could be due to the fact that the J24 prisms are small and so I can get both of them closer to the projector lens than with other prisms.
Ed
I don't actually have large angled prisms, I've just simulating them by using two of the small angled J series prisms.... but in the end I found that just using two small angled prisms (J24's) gave me an image with about the same CA as using four J24s (but with less reflections).
But I look forward to hearing the results of those who are using the CWD series because the angle is different than what I get with two J24 prisms, and there's no reason they shouldn't work well.
I have mixed prisms with different angles in the past (more specifically, I've mixed J24 prisms with J26 prisms which vary by about 0.5 degrees). I measured a tiny increase in the CA, but it was small enough that I couldn't guarantee that it wasn't due to measurement error. Pincushioning didn't change either. I did measure less astigmatism when I just used two J24 prisms, so that's what I decided to stick with in the end. This might not have anything to do with the angles, but could be due to the fact that the J24 prisms are small and so I can get both of them closer to the projector lens than with other prisms.
Ed
