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I basically do that when imaging the spectrum produced by a achromat collimating lens...
Yes is the answer.
Each narrowband "image" will end up at slightly different focus point ( depends on the lens design) but will definately be in focus.
(I use a non-rotating Borg helical focuser which can be calibrated within 5 micron. Once you have the various focus settings you can then just dial them up.)
Hope this helps.
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