DIY anamorphic lens

[Mark Techer]

Hi Neil,

Email returned. I would try and see if you can get that coated glass bonded to the faces of the prisms.

My prisms have a 14.5(?) angle too, so a bit steeper than the 8 degree angles some used. The steeper the angle, the less displacment, but the more material the light has to pass through...

Mark

[nelliekins]

Originally posted by iseealiens
Sorry Mark I should have been clearer; nelliekins is correct I am planning on making mines’ liquid filled for the reason that I think it would be to hard to find someone that will do AR coating on these trophy wedges in the UK.

JB1061 is the 6” plaque number and if you Google it will show other company’s in the UK that sell them. JB1062 is the 7” and JB1063 is the 7.5”.

Let me know if anyone finds a company that can do AR coating in the UK for a reasonable price.

I have one question? Is it better to use these trophy wedges rather then constructing ones liquid filled? And why?

Cheers

Hi iseealiens,

I think you are right regarding finding AR coating for a reasonable price. Which glass are you thinking of using? I've seen something called Mirogard Waterwhite AR - quite expensive, but supposed to be just about as transparent (and perhaps more importantly, colour-neutral) as commercial glass is going to get.

In terms of whether DIY liquid-filled prisms or trophies are better, I would guess that, if done right, the liquid-filled prisms would give the best possible results. However, the marginal gains (in terms of correcting / reducing chromatic aberration, for example) might well be offset by the complexity of the job (sourcing the perfect liquids, manufacturing geometrically perfect prisms, etc).

On the other hand, if a job is worth doing...

Originally posted by Mark Techer
Hi Neil,

Email returned. I would try and see if you can get that coated glass bonded to the faces of the prisms.

My prisms have a 14.5(?) angle too, so a bit steeper than the 8 degree angles some used. The steeper the angle, the less displacment, but the more material the light has to pass through...

Mark

Hi Mark,

Thanks for the email. I wonder if crystal-to-crystal glue would suffice for this? I've found somewhere that sells 6"x4" crystal wedges for about 5GBP(!) (but have a minimum order of quantity of 50GBP for first orders) - they sell crystal glue as well. Here's a link:

http://www.xpres.co.uk/shoppingcart/...cessories.html

Perhaps this would work for attaching the AR glass to the trophies...

As for 14.5 degree angle - is that right? Assuming the trophies are right-angle triangles (in profile), that makes the adjacent 150mm and the opposite 30mm. atan(30/150) = 11.3 degrees (unless I am missing something??)

Neil.

[Mark Techer]

Hi Neil,

No doubt my trigs out

The prisms I use are 170mm (hyp) and 50mm on the base. They are right angled, but don't need to be...

Mark

[Karol N.]

Hi Guys,

this is my first posting here and i have to apologize for my bad english...sorry, i'm writing from germany and unfortunately i'm not an english native speaker

My equipment until now:
Epson EMP-TW 700 projector
Sony PS3 (40GB)
Cinescreen V5

At first, the most important question for me is, where i should buy the prisms for a DIY anamorphic lens? I don't have problems to pay higher shipping costs, if i would buy them in the USA, Canada, Australia or whereever else...

Furthermore, i suppose that neither the ps3, nor the epson projector are able to stretch the image vertically, right?
So, i need a dvd-player with this function or a HTPC.
But i would prefer a dvd player, because in my opinion, a dvd player looks more elegant like a "huge" htpc

I think the Samsung DVD-HD 850/950 players are able for doing this job.

Do you have any other propositions how it is possible to stretch the image by using the ps3?

Regards from germany
Karol

[artbypaul]

Okay, after a long while, (and unfortunately selling my pair of J25 glass prisms), I'm back and ready for a constant height set up again!!!

I just bought an Optoma HD65 projector and I'm tired of watching the 16x9 aspect ratio.

Where can I get the 5x7" glass prisms these days? Anyone have a pair for sale in the USA?

Any help would be appreciated...I'm ready to go WIDE again!!!!

Thanks!
Paul

[Mark Techer]

Hey welcome back Paul

Mark

[artbypaul]

Thanks Mark! I got my screen set up again and watched "Empire Strikes Back" (anamorphic vertically stretched) and I just need to get prisms again.

It's nice to be back...I really missed my home theater and the quest for the best inexpensive anamorphic lenses!

Paul

[Mark Techer]

Originally posted by artbypaul
Thanks Mark! I got my screen set up again and watched "Empire Strikes Back" (anamorphic vertically stretched) and I just need to get prisms again.

It's nice to be back...I really missed my home theater and the quest for the best inexpensive anamorphic lenses!

Paul

Hey Paul, from memory, your prisms were not as steep an angle as mine. Do you remember the angle by change?

I am moving into cylindricals, but these are hardly DIY any more...

Mark

[artbypaul]

I have no idea what the actual angles were, unfortunately. I may just wait a bit and see how the cylindrical lenses work out, both visually and financially.

That said, if anyone wants to sell their prism set up let me know.

Paul

[Mark Techer]

Cylindrical lenses are not cheap - even building this my self will still cost me a few thousand dollars. I am no longer selling my prism based lenses anymore, so am happy to assist those wanting to achieve a prism lens once again.

I have unlocked the secret to CA correction now too but from a DIY perspective, may introduce more problems as well as an addional cost...

Mark