Bud Bray said:
I don't think you should see a difference depending on the direction of the HYP. Think about it--the important part of the prism for bending the light is the angle and the material used, and has nothing to do with how long the one side is compared to the other. The only thing the hyp may be useful for is to provide a large enough surface for the image so that you don't get vignetting.
Steve Scherrer said:
Which is why I've suggested to put them on the outside...
It did make a diference with the water prisms...
Mark
Steve Scherrer said:
I would say surface area. Also I have to consider the fact that my projector is very short throw, so it ran out of prism face quite fast because the beam angles expand way more than a long throw projector would.
What I did notice was that I was not able to get the full 33% stretch that I can get now (and even with the water prisms I can now) when the HYPs originally faced in. I have compared the original LOTR shots with the lastest shots I took the other night, and the first batch are closer to 2.25:1, not 2.35:1...
I also remember being totally frustrated with a massive light reflections everytime I moved them out to get the full stretch. Then one day, I decided to turn them around, and was amazed with the result - true 33% and no light reflections. It was that simple...
Your comment on prisms thickness has me intrigued. That is why I would like someone to try a small air gap between the prisms pairs. So, if your prisms are just 5 degrees, space them with about the same 5 degrees (your total prism thickness now made by the pair will now be 15 degrees) to see how that effects the amount of displacment needed to obtain propper stretch...
What I am hoping for is less displacement because the first prism will bend the light, then the second prism will bend the already bent light. Hopefully, this would will cut down on CA, and edge distortions.
A former poster on AVS (I only know as "AUSSIEBOB" seemed quite knowledgeable about optics) also stated that adding additional elements (but turning them 90 degrees) would also help. He basically stated that by turning these elements 90 degrees, you could create a mini VC lens within the main HE lens. By adding a small amount of vertical compression to the image, you would not need to stretch it as far, hence less CA and edge distortion...
I've placed my order for a second set today, but am not expecting to see them before next week...
Mark
Incidentally, I will be able to easily make the two small prisms work, so I will not be needing the medium one anymore. Anyone want to buy it from me?
Latest pix!
Some I took last night...not the best quality but you get the idea. ROAR is dropping by with his camera so better shots are on the way. BTW, I think I can solve the barreling problem by angling the lenes downwards following the light path, right now I have them level with the output while the beam is actually angled downwards towards the screen. I tested angling the individual prisms downward and the image squared up. Got the wood for the enclosure cut at work today so I should have them mounted soon. ....stay tuned!
Bud
Some I took last night...not the best quality but you get the idea. ROAR is dropping by with his camera so better shots are on the way. BTW, I think I can solve the barreling problem by angling the lenes downwards following the light path, right now I have them level with the output while the beam is actually angled downwards towards the screen. I tested angling the individual prisms downward and the image squared up. Got the wood for the enclosure cut at work today so I should have them mounted soon. ....stay tuned!
Bud
Attachments
Well no promises... but we'll give it a try tonight Bud 🙂 I see king kong is still in the player, I love that scene the t-rex's! I haven't seen it look that good since I saw it at the theatre!
Mark Techer said:
Interesting--although it would be a beast, this is a way to get the proper stretch going from 4:3 to 21:9. First expand 33% (or as much as you can get), then vertically compress the remainder, then zoom to fill the screen (to maintain constant height).
However, this would require a beast of a lens--one set of prisms for HE, the other turned 90deg. for VC--and then having to zoom. What a pain!
Steve Scherrer said:
Yes it could be difficult. Even as a HE lens, the monement you apply any VC, there goes any chance the lens can be slid out of the way as the image height would change from lens in place to lens out of place. For me, leaving the lens in place all the time, it doesn't matter...
Bud, Those picks look great. Is that the 4 prisms lens?
Mark
Yep! Making progress on barrelling. Right now i'm assembling my housing. Still not sure if I can do the rotation since I have each set 2 prisms "TAPED" together. BTW, NONE of the 5 medium prisms are EXACTLY the same size. Close but no cigar.Mark Techer said:
"The human adventure...is just beginning!"
catchy phrase!
Bud Bray said:
I noticed that about the two small prisms I had--they are not precisely the same size. How do they make these things?
My First Post
Hello gang, this is my first post in this forum. A week ago I never heard of anamorphic lenses and now, after reading a lot of this thread, I'm hooked.
I am planning on making a new screen and before doing so I started reading up and came across this topic. It's awesome.
My questions are mostly directed to Steve since he also has a 4:3 projector. Anyone else that has one or can answer the questions, also feel free to chime in.
Like Steve, I would love to go from 4:3 to 2.35:1 but as he indicated, this is not really practical. That said, I'd still be thrilled to go from 4:3 to 16:9. Gaining all those pixels and light output back would be great.
My projector is a Sharp DT-200 which has a short throw of 1.2. I should say I think it's 1.2 since the spec sheet says the lens zoom is 1-1.2. Steve, I would like to know what your projector is and if you or anyone has a 4:3 projector with such a short throw. How does this affect the function of the wedges?
Also, is there a preferred color for the MDF box? I would think black is best, but noticed that Steve's is white. Does it matter?
That's all for now. I plan to learn a little more and then call good ol' Suzan next week to order up some blank wedges.
Thanks everyone.
John
Hello gang, this is my first post in this forum. A week ago I never heard of anamorphic lenses and now, after reading a lot of this thread, I'm hooked.
I am planning on making a new screen and before doing so I started reading up and came across this topic. It's awesome.
My questions are mostly directed to Steve since he also has a 4:3 projector. Anyone else that has one or can answer the questions, also feel free to chime in.
Like Steve, I would love to go from 4:3 to 2.35:1 but as he indicated, this is not really practical. That said, I'd still be thrilled to go from 4:3 to 16:9. Gaining all those pixels and light output back would be great.
My projector is a Sharp DT-200 which has a short throw of 1.2. I should say I think it's 1.2 since the spec sheet says the lens zoom is 1-1.2. Steve, I would like to know what your projector is and if you or anyone has a 4:3 projector with such a short throw. How does this affect the function of the wedges?
Also, is there a preferred color for the MDF box? I would think black is best, but noticed that Steve's is white. Does it matter?
That's all for now. I plan to learn a little more and then call good ol' Suzan next week to order up some blank wedges.
Thanks everyone.
John
Hey everyone! I stumbled on this forum somehow and find it facinating. I ordered 2 trophies/prisms today and the supplier is out! I was told I should get mine in a week or 2. Thanks for all the hard work guys! I'll let you know when I get my stuff in.
Didn't want to spam the site with pictures but here are some snaps I took at Bud's tonight, sorry for making you all click links, maybe that'll add suspense 😛
Anyway, had a great time again, thanks Bud...
I'll add some commentary and then click away...
Taking pictures in a dark room is tough! I think the results are just 'ok' and don't do Bud's setup full justice, that being said, my tri-pod was leaning a bit to one side so there is a tilt on all these pics that I couldn't see from the small display on the back.
Bud and I found this evening that once he added the downward angle to the prims via his box that it made the bow on the bottom of the screen go away... unfortunatly it introduced a bow at the top! Tried switch the small lenses out from the near the projector and using 4 big ones, but it was still there.
Fifth Element was the Super Bit version and looked outstanding, just outstanding, tried to capture a couple of the brighter scenes, I was playing with my camera's settings the whole time, I actually took about 60 pictures and this is what was left them.
Kill Bill looked great too, but was noticeable not as sharp as Fifth Element, this took me by surprise, I always just figured Super Bit was just a fancy label 🙂 Shows you what I know! Thanks Bud, that's going to cost me even more money now having to go out and buy Super Bit versions of the movies I have!
Popped in Finding Nemo too, played it on the Optoma HD72 4:3 mode to see if we could get the constant hight thing going without moving the lens and I think the picture looked amazing! Lots of Finding Nemo shots, I zoomed in on one from where my tripod was standing just to see what it would look like and the results are pretty good.
It was getting late so I called it a night and came home to post these pics... Bud remind me next time to slap that level of yours on my camera! Thanks again!
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/9681/pict0538so1.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/6639/pict0546ms9.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img180.imageshack.us/img180/8810/pict0552wt3.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/9660/pict0554pp4.th.jpg]
Kill Bill 2.35 (Image 1of2)
[img=http://img180.imageshack.us/img180/7457/pict0573qd1.th.jpg]
Kill Bill 2.35 (Image 1of2)
[img=http://img168.imageshack.us/img168/5391/pict0574fz3.th.jpg]
Finding Nemo 1.78 (Image 1of8)
[img=http://img81.imageshack.us/img81/4121/pict0577on8.th.jpg]
Finding Nemo 1.78 (Image 2of8)
[img=http://img180.imageshack.us/img180/4038/pict0579aj5.th.jpg]
Finding Nemo 1.78 (Image 3of8)
[img=http://img168.imageshack.us/img168/3746/pict0581xp8.th.jpg]
Finding Nemo 1.78 (Image 4of8)
[img=http://img81.imageshack.us/img81/2594/pict0583ty4.th.jpg]
Finding Nemo 1.78 (Image 5of8)
[img=http://img180.imageshack.us/img180/1465/pict0585nv6.th.jpg]
Finding Nemo 1.78 (Image 6of8)
[img=http://img168.imageshack.us/img168/3108/pict0588zv8.th.jpg]
Finding Nemo 1.78 (Image 7of8)
[img=http://img81.imageshack.us/img81/355/pict0590rt1.th.jpg]
Finding Nemo 1.78 (Image 8of8)
[img=http://img168.imageshack.us/img168/8479/pict0596di6.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 1of3)
[img=http://img81.imageshack.us/img81/6564/pict0599it7.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 2of3)
[img=http://img168.imageshack.us/img168/8078/pict0600fz8.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 3of3)
[img=http://img168.imageshack.us/img168/6712/pict0601nb0.th.jpg]
Anyway, had a great time again, thanks Bud...
I'll add some commentary and then click away...
Taking pictures in a dark room is tough! I think the results are just 'ok' and don't do Bud's setup full justice, that being said, my tri-pod was leaning a bit to one side so there is a tilt on all these pics that I couldn't see from the small display on the back.
Bud and I found this evening that once he added the downward angle to the prims via his box that it made the bow on the bottom of the screen go away... unfortunatly it introduced a bow at the top! Tried switch the small lenses out from the near the projector and using 4 big ones, but it was still there.
Fifth Element was the Super Bit version and looked outstanding, just outstanding, tried to capture a couple of the brighter scenes, I was playing with my camera's settings the whole time, I actually took about 60 pictures and this is what was left them.
Kill Bill looked great too, but was noticeable not as sharp as Fifth Element, this took me by surprise, I always just figured Super Bit was just a fancy label 🙂 Shows you what I know! Thanks Bud, that's going to cost me even more money now having to go out and buy Super Bit versions of the movies I have!
Popped in Finding Nemo too, played it on the Optoma HD72 4:3 mode to see if we could get the constant hight thing going without moving the lens and I think the picture looked amazing! Lots of Finding Nemo shots, I zoomed in on one from where my tripod was standing just to see what it would look like and the results are pretty good.
It was getting late so I called it a night and came home to post these pics... Bud remind me next time to slap that level of yours on my camera! Thanks again!
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/9681/pict0538so1.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/6639/pict0546ms9.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img180.imageshack.us/img180/8810/pict0552wt3.th.jpg]
Fifth Element Superbit 2.35 (Image 1of4)
[img=http://img81.imageshack.us/img81/9660/pict0554pp4.th.jpg]
Kill Bill 2.35 (Image 1of2)
[img=http://img180.imageshack.us/img180/7457/pict0573qd1.th.jpg]
Kill Bill 2.35 (Image 1of2)
[img=http://img168.imageshack.us/img168/5391/pict0574fz3.th.jpg]
Finding Nemo 1.78 (Image 1of8)
[img=http://img81.imageshack.us/img81/4121/pict0577on8.th.jpg]
Finding Nemo 1.78 (Image 2of8)
[img=http://img180.imageshack.us/img180/4038/pict0579aj5.th.jpg]
Finding Nemo 1.78 (Image 3of8)
[img=http://img168.imageshack.us/img168/3746/pict0581xp8.th.jpg]
Finding Nemo 1.78 (Image 4of8)
[img=http://img81.imageshack.us/img81/2594/pict0583ty4.th.jpg]
Finding Nemo 1.78 (Image 5of8)
[img=http://img180.imageshack.us/img180/1465/pict0585nv6.th.jpg]
Finding Nemo 1.78 (Image 6of8)
[img=http://img168.imageshack.us/img168/3108/pict0588zv8.th.jpg]
Finding Nemo 1.78 (Image 7of8)
[img=http://img81.imageshack.us/img81/355/pict0590rt1.th.jpg]
Finding Nemo 1.78 (Image 8of8)
[img=http://img168.imageshack.us/img168/8479/pict0596di6.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 1of3)
[img=http://img81.imageshack.us/img81/6564/pict0599it7.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 2of3)
[img=http://img168.imageshack.us/img168/8078/pict0600fz8.th.jpg]
Bud's Optoma HD72 + 4 Lens Setup (Image 3of3)
[img=http://img168.imageshack.us/img168/6712/pict0601nb0.th.jpg]
Re: My First Post
I'm not sure if they are hand pollished Steve as mine are the same size...I'll let you know if batches differ when my next two arrive next week...
Welcome to the thread John 🙂 I'll try and answer some of the questions -
1.0 - 1.2 is a very short throw, so you will need large prisms. My 16:9 projector is 1.0 - 1.3, and I have tested the full zoom range with my lens and it works with no problems. My prisms are two 140mm x 170mm or 5.5" x 7.5".
Right now I have raw MDF as I am still prototyping the box. I have just come back from my board cutter with the lastest design that is drawn on my BLOG (you click the www icon at the bottom of my post to see it)...
Yes black will work best, but lighter colours also seem to work. The important part is to block out the ends of the prisms. Gaff tape seems to work well here 🙂
This project is really a 33% stretch lens, so you can only go from 12:9 (4 x 3) to 16:9 using a 4 x 3 projector, but none the less, your aware that you will gain back all of the pixels on the panel...
Cool, bet they had surplus stock a few week ago...
These shots look awesome Roar, and Bud you have done really well with this project. Geometry looks correct and I can not see any CA even on the close up....
Again, very well done 🙂
Mark
Steve Scherrer said:
I'm not sure if they are hand pollished Steve as mine are the same size...I'll let you know if batches differ when my next two arrive next week...
johnstof said:
Welcome to the thread John 🙂 I'll try and answer some of the questions -
1.0 - 1.2 is a very short throw, so you will need large prisms. My 16:9 projector is 1.0 - 1.3, and I have tested the full zoom range with my lens and it works with no problems. My prisms are two 140mm x 170mm or 5.5" x 7.5".
Right now I have raw MDF as I am still prototyping the box. I have just come back from my board cutter with the lastest design that is drawn on my BLOG (you click the www icon at the bottom of my post to see it)...
Yes black will work best, but lighter colours also seem to work. The important part is to block out the ends of the prisms. Gaff tape seems to work well here 🙂
This project is really a 33% stretch lens, so you can only go from 12:9 (4 x 3) to 16:9 using a 4 x 3 projector, but none the less, your aware that you will gain back all of the pixels on the panel...
klemsaba said:
Cool, bet they had surplus stock a few week ago...
roar said:
These shots look awesome Roar, and Bud you have done really well with this project. Geometry looks correct and I can not see any CA even on the close up....
Again, very well done 🙂
Mark
Wow! Those pix DO look good, even the Kill Bill which we noticed wasn't nearly as sharp as the superbit. Ya, we now have bowing on all sides so i'm going to build another housing for the twin medium lenses & try that. The tilting down IS the solution but I think right now I have the lens too far away from the projector...tonite i'll fix that.
Getting closer!
Thanks again ROAR, sorry it was a bit late last nite, great camera work!
Bud
Getting closer!
Thanks again ROAR, sorry it was a bit late last nite, great camera work!
Bud
Bud Bray said:
I loved those films, but I couldn't remember them as scope 😕 as the last time I watched them was before my CIH system...
I think I am going to have to shout myself a treat soon with KB 1 and 2...
Mark