[ATM] f/15 Doublets

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Three normal glass 152 mm f/15 doublets...

The first approximates a canonical doublet (if there is
such a thing), but does so in a cemented/oiled form.  It
is corrected for both coma and spherical aberration as
well as being close to the C-F color correction:

    http://users.rcn.com/rflrs/dbl01-40.atm   ATMOS file
    http://users.rcn.com/rflrs/dbl01-40.len   OSLO file
    http://users.rcn.com/rflrs/dbl01-40.txt   TEXT file
    http://users.rcn.com/rflrs/dbl01-40.zmx   ZEMAX file

BTW, of the four combinations (N-BK7:S-BSL7/N-SF5:S-TIM25),
this is the only one that is "close" to the C-F correction
(in the sense that the two lines cross somewhere within the
aperture).  That may indicate to you how quickly refractive
index differences may affect that quality.

The other two are air-spaced.  They have higher order
correction of spherical aberration, and have C-F
correction:

    http://users.rcn.com/rflrs/dbl01-43.atm   ATMOS file
    http://users.rcn.com/rflrs/dbl01-43.len   OSLO file
    http://users.rcn.com/rflrs/dbl01-43.txt   TEXT file
    http://users.rcn.com/rflrs/dbl01-43.zmx   ZEMAX file

    http://users.rcn.com/rflrs/dbl01-53.atm   ATMOS file
    http://users.rcn.com/rflrs/dbl01-53.len   OSLO file
    http://users.rcn.com/rflrs/dbl01-53.txt   TEXT file
    http://users.rcn.com/rflrs/dbl01-53.zmx   ZEMAX file

The first of these has a smaller air-space, so has better
correction of lateral color.  The second has better
correction of longitudinal color.

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