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Re: [ATM] Luri-Houghton prescriptions.
If the mirror has the same radius with the first corrector surface, you
still need to deal with 4 different radius. For 'Infinity', you still need
to make a plane, that is not easy.
Either choose the best result, use 5 different radius;
Or choose the most simple way, use equal radius.
>From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
>To: atm@atmlist.net
>Subject: Re: [ATM] Luri-Houghton prescriptions.
>Date: Tue, 18 Oct 2005 03:56:57 -0400
>
>Ukyo Chen wrote:
>
> >Different:
> >
> >*LENS DATA
> >No name
> >SRF RADIUS THICKNESS APERTURE RADIUS GLASS SPE NOTE
> >OBJ -- 1.0000e+20 1.0472e+18 AIR
> >
> >AST 2.2035e+03 V 20.000000 159.000000 ASX BK7 C
> > 2 3.1078e+03 V 15.000000 159.000000 P AIR
> >
> > 3 -1.2563e+03 V 15.000000 159.000000 P BK7 P
> > 4 -1.5177e+03 V 1.2800e+03 159.000000 P AIR
> >
> > 5 -2.9250e+03 -1.2000e+03 P 172.827007 S REFL_HATCH
> >
> > 6 -- 159.000000 43.720519 S REFL_HATCH
> >
> > 7 -- 104.887242 S 26.613909 S AIR
> >
> > 8 -- -- 15.329223 S AIR
> >
> >IMS -- -- 15.329223 S
> >
>I have suggested a design short of that; one that minimizes glass use --
>leave the last surface flat. In that way, it still fits into the smallest
>possible lens blank while providing a more optimal design:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1676269 12.5
> 2 116.6 0.78 N-BK7 13
> 3 -424.4 0.19 13
> 4 -91.4 0.55 N-BK7 13
> 5 Infinity 50.5 13
> 6 -119 -48.5 MIRROR 13.75
> 7 Infinity -10.95741 3.963536 (secondary)
> IMA -170.4668 1.700382
>
>The first surface has radius close to that of the mirror. Under
>the constraints of this design, and by selecting a different refractive
>index and a different f/#, these can be made to match (the refractive
>index here is the RMS mean refractive index in the visual band; it
>actually works out to be the refractive index of the glass at about
>554.4 to 554.5 nm):
>
>f/5.551, n = 1.518303:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1411938 12.5
> 2 138.4 0.78 N-BK7 13
> 3 -455.5 0.16 13
> 4 -106.1 0.58 N-BK7 13
> 5 Infinity 60.2 13
> 6 -138.4 -58.2 MIRROR 13.75
> 7 Infinity -10.95756 3.650144
> IMA -186.2714 1.700268
>
>f/5.391, n = 1.524130:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1453896 12.5
> 2 134.41 0.78 N-K5 13
> 3 -455.2 0.17 13
> 4 -103.7 0.576 N-K5 13
> 5 Infinity 58.205 13
> 6 -134.41 -56.205 MIRROR 13.75
> 7 Infinity -10.9603 3.707734
> IMA -182.8639 1.700296
>
>f/5.378, n = 1.524749:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1457587 12.5
> 2 134.07 0.78 B270 13
> 3 -455.4 0.17 13
> 4 -103.5 0.576 B270 13
> 5 Infinity 58.035 13
> 6 -134.07 -56.035 MIRROR 13.75
> 7 Infinity -10.96189 3.713051
> IMA -182.5092 1.7003
>
>f/4.990, n = 1.541650:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1571661 12.5
> 2 124.35 0.78 N-BAK2 13
> 3 -459.6 0.18 13
> 4 -97.78 0.563 N-BAK2 13
> 5 Infinity 53.175 13
> 6 -124.35 -51.175 MIRROR 13.75
> 7 Infinity -10.96107 3.868029
> IMA -175.0516 1.70036
>
>f/4.472, n = 1.570727:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> STO Infinity -0.1754636 12.5
> 2 111.4 0.78 N-BAK4 13
> 3 -480.7 0.2 13
> 4 -90.35 0.546 N-BAK4 13
> 5 Infinity 46.7 13
> 6 -111.4 -44.7 MIRROR 13.75
> 7 Infinity -10.95422 4.114689
> IMA -164.9338 1.700476
>
>
>
>
>
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