DIY anamorphic lens - Page 114

Bud Bray · 9th November 2006, 01:16 PM

Unfortunatly, the housing isn't sealed. I will try something like that tho. I think the tapered housing(since i'm presently using a small & a medium lens) seems to work better because the sides aren't acute angles to the prisms, so the reflections don't reflect the same. I was watching the CARS credits inside the housing last night...there were 2 sets. 1 from the first prism reflecting on the side wall, 1 reflecting off the 2nd prism face back onto the side wall.
OH well, that's what DIY is all about...trial & error, if a first, yada, yada, yada!

Bud

Mark Techer · 9th November 2006, 01:34 PM

Isn't it interesting? I wanted to watch The Da Vinci Code the other day, and the "green streaks" were right across the screen. It was the worst I had ever seem them in over a year of DIY lens development.

I removed the lens, and repositioned it - nothing they were still there. I flipped the lens upside down - again nothing, still there...

I ripped it out again, replaced it and the green streaks were gone and have not come back (except for the very faint ones on the far left) since...

Mark

artbypaul · 9th November 2006, 01:57 PM

I'm telling you, these DIY lenses seem to have a mind of their own!

Bud Bray · 9th November 2006, 03:30 PM

Quote:

Originally posted by Mark Techer
Isn't it interesting? I wanted to watch The Da Vinci Code the other day, and the "green streaks" were right across the screen. It was the worst I had ever seem them in over a year of DIY lens development.

I removed the lens, and repositioned it - nothing they were still there. I flipped the lens upside down - again nothing, still there...

I ripped it out again, replaced it and the green streaks were gone and have not come back (except for the very faint ones on the far left) since...

Mark

Ya, I had the same...dipped into my "spare" lenses thet ROAR got me. Replaced 1 of the 4 and the CA cleared up...Funny, the same set worked fine before....GREMLINS!

Mark, have you tried(do you HAVE) CARS and watched the end credits? THERE'S nasty reflection! White scrolling text for several minutes. NASTY!

Bud

Bud Bray · 9th November 2006, 04:09 PM

Quote:

Originally posted by artbypaul
I'm telling you, these DIY lenses seem to have a mind of their own!

Another DIY having hiccups?

artbypaul · 9th November 2006, 04:15 PM

Not any more than normal. The same stray reflections that a lot of us DIY guys are experiencing. Like I said, the stray reflections have diminished considerably since repositioning my prisms. But alas, they will still rear their ugly heads when I least expect it! Small price to pay for such an immense image... I really shouldn't complain!

Lindahl · 9th November 2006, 04:49 PM

Are these reflections you guys are getting on the walls, or on the screen? Can they completely eliminated by putting black velvet on all parts except the light entry and exit points? Thinking about picking up some prisms and trying this out.

Bud Bray · 9th November 2006, 06:20 PM

Quote:

Originally posted by Lindahl
Are these reflections you guys are getting on the walls, or on the screen? Can they completely eliminated by putting black velvet on all parts except the light entry and exit points? Thinking about picking up some prisms and trying this out.

The reflections on the wall can be controled/eliminated, We're discussing the screen reflections. For the most part, the one reflection which is difficult to remove is a BRIGHT image(THX LOGO) on a black background. Depending on the orientation of your prisms, the reflection will be on the far left or right. This image is minor and not very distracting, my recent problem is rolling white credits on black look the WHOLE screen has credits. This is a new problem which I can easily fix, go back to my previous housing.
My opinion is by all means, get some prisms & give it a try. The results are FANTASTIC! For a fraction of commercial lenses, you get anamorphic projection, what ever size you want, great picture. 1 small ghost image on black is hardly a deal breaker. Enjoy!

Bud

Mark Techer · 9th November 2006, 10:19 PM

Quote:

Originally posted by Bud Bray

Mark, have you tried(do you HAVE) CARS and watched the end credits? THERE'S nasty reflection! White scrolling text for several minutes. NASTY!

Bud

Yep, sure do (we got it befor you guys

) and I tried to capture the green streaks by taking photos of the THX logo and the frenh rat preview on this disc. Go back a page or so to see the images. No green streak showed up...

Mark

D_B_0673 · 9th November 2006, 10:23 PM

I called the company
http://www.evaporatedcoatings.com/index.htm
that was suggested and asked about having the prisms anti-reflective coated. I spoke to Pat (male) and he said usually it would be a batch price of about $800. I asked if perhaps an individual could have his 2 or 4 pieces put into another buyers batch and he seemed to be agreeable to that. I asked him to give me a guess at a price for that and gave him the sizes of the prisms. He said he would email me, but I have not heard yet. I am guessing/hoping no more than about 40 or 50 each.
I told him there could be quite a number of folks interested if he would do it.

9th November 2006, 01:34 PM	#1132
Mark Techer diyAudio Member Join Date: Aug 2005	Green Streaks? Isn't it interesting? I wanted to watch The Da Vinci Code the other day, and the "green streaks" were right across the screen. It was the worst I had ever seem them in over a year of DIY lens development. I removed the lens, and repositioned it - nothing they were still there. I flipped the lens upside down - again nothing, still there... I ripped it out again, replaced it and the green streaks were gone and have not come back (except for the very faint ones on the far left) since... Mark __________________ CIH Explained

9th November 2006, 10:23 PM	#1140
D_B_0673 diyAudio Member Join Date: Oct 2006	AR Coatings I called the company http://www.evaporatedcoatings.com/index.htm that was suggested and asked about having the prisms anti-reflective coated. I spoke to Pat (male) and he said usually it would be a batch price of about $800. I asked if perhaps an individual could have his 2 or 4 pieces put into another buyers batch and he seemed to be agreeable to that. I asked him to give me a guess at a price for that and gave him the sizes of the prisms. He said he would email me, but I have not heard yet. I am guessing/hoping no more than about 40 or 50 each. I told him there could be quite a number of folks interested if he would do it.

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9th November 2006, 01:16 PM	#1131
Bud Bray diyAudio Member Join Date: Feb 2006 Location: Burlington,Ontario	Unfortunatly, the housing isn't sealed. I will try something like that tho. I think the tapered housing(since i'm presently using a small & a medium lens) seems to work better because the sides aren't acute angles to the prisms, so the reflections don't reflect the same. I was watching the CARS credits inside the housing last night...there were 2 sets. 1 from the first prism reflecting on the side wall, 1 reflecting off the 2nd prism face back onto the side wall. OH well, that's what DIY is all about...trial & error, if a first, yada, yada, yada! Bud

9th November 2006, 01:57 PM	#1133
artbypaul diyAudio Member Join Date: Oct 2006	I'm telling you, these DIY lenses seem to have a mind of their own!

9th November 2006, 04:15 PM	#1136
artbypaul diyAudio Member Join Date: Oct 2006	Not any more than normal. The same stray reflections that a lot of us DIY guys are experiencing. Like I said, the stray reflections have diminished considerably since repositioning my prisms. But alas, they will still rear their ugly heads when I least expect it! Small price to pay for such an immense image... I really shouldn't complain!

9th November 2006, 04:49 PM	#1137
Lindahl diyAudio Member Join Date: Jun 2006	Are these reflections you guys are getting on the walls, or on the screen? Can they completely eliminated by putting black velvet on all parts except the light entry and exit points? Thinking about picking up some prisms and trying this out.

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