Lens Options

[rrs711]

I've studied all of the threads here, as well as the massive thread at diyaudio, and the work over at CAVX. All very impressive.

My questions are as follows:

1) Assuming I go with a 2 lens system, what are the preferred peak angles? It seems that most folks go with whatever they can buy as a stock item from a vendor. My company does a lot of ordering of promo products, soI can get pretty decent prices on custom made acrylic wedges. From what I've read, its better to have two different peak angles, in order to be able to compensate in the second lens (with a larger peak angle) for the chromatic dispersion from the first lens. I'm assuming acrylic here.

2) What about combining one acrylic and one crystal lens? Does the difference in diffraction index accomplish the same thing? Sort of like the water/oil lenses.

3) For a 4 lens system, again any recommendations on the peak angles?

Thanks in advance.

[CAVX]

I've studied all of the threads here, as well as the massive thread at diyaudio, and the work over at CAVX. All very impressive.

Thank you :)

My questions are as follows:

1) Assuming I go with a 2 lens system, what are the preferred peak angles? It seems that most folks go with whatever they can buy as a stock item from a vendor. My company does a lot of ordering of promo products, soI can get pretty decent prices on custom made acrylic wedges. From what I've read, its better to have two different peak angles, in order to be able to compensate in the second lens (with a larger peak angle) for the chromatic dispersion from the first lens. I'm assuming acrylic here. There is are minimum angles needed to obtain the desired 33% stretch, but those angle are also dependent on the material the prism is made from...

2) What about combining one acrylic and one crystal lens? Does the difference in diffraction index accomplish the same thing? Sort of like the water/oil lenses.
Given that both material have different refractive indices might (assuming the correct values) give you the result your after. From a DIY perpsective, it worth a try...

3) For a 4 lens system, again any recommendations on the peak angles?

Thanks in advance.Your angles could theoretically be halved, but again, will still be dependent on the material each prism in made from. The key point everyone seems to miss with a 4 prisms lens, is that the prisms must be bonded in pairs so there is no air/glass surface between the two prisms...

Mark