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Re: [ATM] N-KZFS-4
Richard F.L.R. Snashall wrote:
>
>The BAK4 design is quite similar to the
>following design for a 125 mm f/12 refractor:
>
>Surf Radius Thickness Glass Diameter
> OBJ Infinity Infinity 0
> 1 658.4885 11.52753 N-BAK4 130
> 2 -6780.276 23.12584 130
> STO Infinity 6.881435 121.6813
> 4 -272.3951 14.15397 F2 130
> 5 -143.8506 8 N-KZFS4 130
> 6 449.4114 19.88205 N-BK7 130
> 7 -248.3615 1501.053 130
> IMA -947.4752 26.02613
>
>The stop is placed coincident with the front mounting of the
>triplet; its diameter calculated to provide the 125 mm effective
>aperture.
>
But:
Surf Radius Thickness Glass Diameter
OBJ Infinity Infinity 0
1 1553.713 11.77975 N-BAK4 130
2 -874.3206 37.13928 130
STO Infinity 9.911175 119.7946
4 -185.9477 8 N-KZFS4 130
5 192.3444 16.16369 F5 130
6 1279.523 20.27615 N-BK7 130
7 -180.3021 1517.568 128.0278
IMA -1440.639 26.02212
does about as well (maybe a tad better across the field) with
shallower curves. However, it also does not match up well with
the in-hand glass.
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